In this blog, I am going to provide a comprehensive guide on Aux AC error codes. As the summer season approaches, air conditioning units become an essential part of our daily lives. However, just like any other electronic device, air conditioners can also encounter errors and malfunctions.

By reading this blog, you will learn about different error codes that can appear on your Aux Air Conditioner, their meanings, and the troubleshooting steps to fix them.

 

Aux AC Error Codes List

ERROR CODE (display board)	ERROR CODE (wired controller)	DESCRIPTION
L1	C1	The fault with the over-electric current protection
L3	C3	The fault with the compressor The power supply Phase deficiency protection
L4	C4	The fault with the inverter module protection (IPM)
E1	E1	The fault with the room temperature sensor (Tico) on the indoor unit
E2	E2	The fault with the temperature sensor (Ticm) on the outdoor unit
E3	E3	The fault with the temperature sensor (Ticm) on the indoor unit
E4	E4	The fault with the fan motor of the indoor unit
E5	E5	Communication error between the outdoor unit and the indoor unit
E8	E8	Communication error between the display board and PCB of the indoor unit
F0	F0	The fault with the fan motor of the outdoor unit
F1	F1	The fault with the inverter module protection on the outdoor unit
F3	F3	The fault with the compressor starts
F4	F4	the fault with the discharge temperature sensor
F6	F6	The fault with the Environ temperature sensor (Tao) on the outdoor unit
F7	F7	The fault with the over-voltage or low-voltage protection
F8	F8	Communication error between the driver PCB and the main PCB of the outdoor unit
F9	F9	The fault with the outdoor unit EPROM
H1	H1	The fault with the drainage
H2	H2	Communication error between the wired controller and the main PCB of the indoor unit
H5	H5	the fault with the low-temperature discharge temperature sensor AUX DC Inverter Free Match 50HZ R32
H6	H6	the fault with the low-pressure switch
H7	H7	the fault with the low pressure
H8	H8	the fault of the four-way valve
P2	J2	the fault with the High-pressure switch
P5	J5	Protection high-temperature discharge
P6	J6	The fault with anti-high-temperature protection of the indoor unit in the heating mode
P7	J7	The fault with the anti-Frozen protection of the indoor unit in the heating mode

 

 

 

Aux Commercial Floor Standing AC Error Codes

The fault	The fault Code definition	Possible cause	Solution
Code
		1. The outdoor unit is the power off	1. Turn on the power for the outdoor unit
	Communication the fault	2. The communication wire of units lost	2. Reconnect firmly
F1		3. Insert the wrong plug into the indoor or the outdoor unit control board	3. Loosen and insert the right plug
	between the indoor unit and
		4. The communication wire is an open or short circuit	4. Replace a normal communication wire
	the outdoor unit
		5. The indoor unit control board malfunction	5. Replace the control board
		6. The outdoor unit control board malfunction	6. Replace the control board
	Input the power supply phase	1. Phase loss	1. Reconnect the wires firmly
E6		2. Low-voltage	2. Check if the power supply is consistent with the
	sequence protection
		3. Phase dislocation	nameplate
	（The outdoor unit）
			3. Exchange the two-phase sequence of the power supply
		1. Sensor directly contacts with the heat exchanger	1. Refix the sensor correctly
E1	The indoor ambient temperature	2. Sensor plug insert again	2. Reinsert
	sensor the fault	3. Sensor is an open or short circuit	3. Replace the sensor
		4. The indoor unit control board malfunction	4. Replace the indoor unit control board
F3	the outdoor the fan protection	1. The outdoor unit ventilation insufficient	1. Improve or enhance the ventilation
		2. The fan motor stuck	2. Replace the fan motor
		1. the outdoor fan blade broken	1. Replace the fan blade
		2. the connection between the fan blade and the outdoor the fan motor	2. Tighten or replace the sleeve
		loose
		3. the outdoor fan stops working	3. Eliminate the malfunction cause
F2	Discharge temperature	4. the outdoor ventilation insufficient	4. Improve or enhance the ventilation
	protection	5. the outdoor exchanger is dirty or sticky	5. Clean the heat exchanger
		6. discharge temperature sensor deviation	6. Replace the sensor
		7. Refrigerant leak	7. Find out the leak point, repair the welding, refill the freon unit
			after vacuuming it
		8. The capillary or the filter is blocked	8. Replace the capillary or filter
		1. the globe valve is closed	1. Open the globe valve
		2. the outdoor fan blade broken	2. Replace the fan blade
		3. the connection between the fan blade and the outdoor the fan motor	3. tighten or replace the sleeve
EH	High-pressure protection	loose
		4. the outdoor fan stops working	4. Eliminate the malfunction cause
		5. the outdoor ventilation insufficient	5. Improve or enhance the ventilation
		6. the connection between the high-pressure switch and the control board	6. Reconnect the wire to the control board
		loose

 

			7. High-pressure switch malfunction	7. Replace the high-pressure switch
			8. the outdoor exchanger is dirty or sticky	8. Clean the heat exchanger
			9. there are some moistures in the refrigerant line	9. Refill the freon unit after vacuuming it
			10. The capillary or the filter is blocked	10. Replace the capillary or filter
			1. the globe valve is closed	1. open the globe valve
			2. the indoor fan blade broken	2. tighten or replace the sleeve
			3. the connection between the fan blade and the indoor the fan motor	3. the indoor fan blade broken
			loose
			4. the outdoor fan stops working	4. Eliminate the malfunction cause
	EL	Low-pressure protection	5. filter net is dirty	5. Clean the filter
			6. Refrigerant leak	6. Find out the leak point, repair the welding, refill the freon unit
				after vacuuming it
			7. the connection between the low-pressure switch and the control board	7. Reconnect the wire to the control board
			loose
			8. Low-pressure switch malfunction	8. Replace the low-pressure switch
			9. The capillary or the filter is blocked	9. Replace the capillary or filter
			1. Refrigerant leak	1. Find out the leak point, repair the welding, refill the freon
	E0	Refrigerant lack protection/4-		unit after vacuuming it
			2. 4-way valve coil open or short circuit	2. Replace the 4-way valve coil
		way valve the fault protection
			3. Valve block cannot get the designated position or Valve blow-	3. Replace the 4-way valve
			by
			1. Sensor separates from the coil	1. Refix the sensor correctly
	E3	The indoor coil temperature sensor	2. Sensor plug insert again	2. Reinsert
		the fault (TE)	3. Sensor is an open or short circuit	3. Replace the sensor
			4. The indoor unit control board malfunction	4. Replace the indoor unit control board
			1. Sensor separates from the coil	1. Refix the sensor correctly
	E2	The outdoor coil temperature sensor	2. Sensor plug insert again	2. Reinsert
		the fault (TW)	3. Sensor is an open or short circuit	3. Replace the sensor
			4. The outdoor unit control board malfunction	4. Replace the outdoor unit control board
			1. sensor separate from the copper tube	1. Refix the sensor correctly
	E8	Discharge temperature （TP）	2. Sensor plug insert again	2. Reinsert
		sensor the fault	3. Sensor is an open or short circuit	3. Replace the sensor
			4. The outdoor unit control board malfunction	4. Replace the outdoor unit control board
	E9	Electric heating protection	1.  Electric heater is an open or short circuit	1.  Replace a normal one
			2.  The blower malfunction	2.  Replace a normal one

 

 

 

 

Aux Duct Type AC Error Codes

The fault	The fault code definition		Possible cause	Solution
code
			1.  The connection loose	1.  reconnect firmly
E5	Wired controller		2.  Wired controller malfunction	2.  replace a new one
			3.  The communication wire is an open or short circuit	3.  replace a normal one
	communication the fault
			4.  The indoor unit control board malfunction	4. replace a new one
			1.  Drain pipe is blocked	1.  Clean the drain pipe
E4			2.  Float switch short-circuit or unconnected	2.  Rapace float switch or reconnect it
	Drainage system the fault		3.  The power line of the water pump lose	3.  Reconnect the power line of the water pump
			4.  The water pump is broken	4. Replace the water pump
			5. The indoor PCB is broken	5. Replace PCB
			1. Sensor directly contacts with the heat exchanger	1. Refix the sensor correctly
E1	The indoor ambient temperature		2. Sensor plug insert again	2. Reinsert
	sensor the fault		3. Sensor is an open or short circuit	3. Replace the sensor
			4. The indoor unit control board malfunction	4. Replace the indoor unit control board
			1. Sensor separated from the coil	1. Refix the sensor correctly
E3	The indoor coil temperature sensor		2. Sensor plug insert again	2. Reinsert
	the fault (TE)		3. Sensor is an open or short circuit	3. Replace the sensor
			4. The indoor unit control board malfunction	4. Replace the indoor unit control board
			1. Sensor separated from the coil	1. Refix the sensor correctly
E2	The outdoor coil temperature sensor		2. Sensor plug insert again	2. Reinsert
	the fault (TW)		3. Sensor is an open or short circuit	3. Replace the sensor
			4. The outdoor unit control board malfunction	4. Replace the outdoor unit control board
			1. Sensor directly contacts with the heat exchanger	1. Refix the sensor correctly
E7	The outdoor ambient temperature		2. Sensor plug insert again	2. Reinsert
	the sensor with the fault (TL)		3. Sensor is an open or short circuit	3. Replace the sensor
			4. The outdoor unit control board malfunction	4. Replace the outdoor unit control board
			1. Refrigerant leak	1. Find out the leak point, repair the welding, refill
E0	Refrigerant lack protection/4-way			the unit after vacuuming it
	valve the fault protection		2. 4-way valve coil open or short circuit	2. Replace the 4-way valve coil
			3. Valve block cannot get the designated position or Valve blow-by	3. Replace the 4-way valve

 

			1. The outdoor unit is the power off	1. Turn on the power for the outdoor unit
		Communication the fault	2. The communication wire of units lost	2. Reconnect firmly
	F1		3. Insert the wrong plug into the indoor or the outdoor unit control board	3. Loosen and insert the right plug
		between the indoor unit and
		the outdoor unit	4. The communication wire is an open or short circuit	4. Replace a normal communication wire
			5. The indoor unit control board malfunction	5. Replace the control board
			6. The outdoor unit control board malfunction	6. Replace the control board
			1. The connection loose	1. Reconnect firmly
	E5	Wired controller	2. Wired controller malfunction	2. Replace a new one
		communication the fault	3. The communication wire is an open or short circuit	3. Replace a normal one
			4. The indoor unit control board malfunction	4. Replace a new one
			1. Drain pipe is blocked	1. Clean the drain pipe
	E4		2. Float switch short-circuit or unconnected	2. Repace the float switch or reconnect it
		Drainage system the fault	3. The power line of the water pump loose	3. Reconnect the power line of the water pump
			4. The water pump is broken	4. Replace the water pump
			5. The indoor PCB is broken	5. Replace PCB
		Input the power supply phase	1. Phase loss	1. Reconnect the wires firmly
	E6		2. Low-voltage	2. Check if the power supply is consistent with the
		sequence protection		nameplate
		（The outdoor unit）	3. Phase dislocation	3. Exchange the two-phase sequence of the power
				supply
			1. the outdoor fan blade broken	1. Replace the fan blade
			2. the connection between the fan blade and the outdoor the fan motor	2. Tighten or replace the sleeve
			loose
			3. the outdoor fan stops working	3. Eliminate the malfunction cause
	EA	Discharge temperature	4. the outdoor ventilation insufficient	4. Improve or enhance the ventilation
		protection	5. the outdoor exchanger is dirty or sticky	5. Clean the heat exchanger
			6. discharge temperature sensor deviation	6. Replace the sensor
			7. Refrigerant leak	7. Find out the leak point, repair the welding, refill the freon
				unit after vacuuming it
			8. The capillary or the filter is blocked	8. Replace the capillary or filter
	E9	High-pressure protection	1. the globe valve is closed	1. Open the globe valve
			2. the outdoor fan blade broken	2. Replace the fan blade

 

			3. the connection between the fan blade and the outdoor the fan motor	3. tighten or replace the sleeve
			loose
			4. the outdoor fan stops working	4. Eliminate the malfunction cause
			5. the outdoor ventilation insufficient	5. Improve or enhance the ventilation
			6. the connection between the high-pressure switch and the control	6. Reconnect the wire to the control board
			board loose
			7. High-pressure switch malfunction	7. Replace the high-pressure switch
			8. the outdoor exchanger is dirty or sticky	8. Clean the heat exchanger
			9. there are some moistures in the refrigerant line	9. Refill the freon unit after vacuuming it
			10. The capillary or the filter is blocked	10. Replace the capillary or filter
			1. The globe valve is closed	1. Open the globe valve
			2. The indoor fan blade broken	2. Tighten or replace the sleeve
			3. The connection between the fan blade and the indoor the fan motor	3. The indoor fan blade broken
			loose
			4. The outdoor fan stops working	4. Eliminate the malfunction cause
	E9	Low-pressure protection	5. Filter net is dirty	5. Clean the filter
			6. Refrigerant leak	6. Find out the leak point, repair the welding, refill the freon
				unit after vacuuming it
			7. The connection between the low-pressure switch and the control	7. Reconnect the wire to the control board
			board loose
			8. Low-pressure switch malfunction	8. Replace the low-pressure switch
			9. The capillary or the filter is blocked	9. Replace the capillary or filter
			1. Sensor directly contacts with the heat exchanger	1. Refix the sensor correctly
	E1	The indoor ambient temperature	2. Sensor plug insert again	2. Reinsert
		sensor the fault	3. Sensor is an open or short circuit	3. Replace the sensor
			4. The indoor unit control board malfunction	4. Replace the indoor unit control board
			1. Sensor separated from the coil	1. Refix the sensor correctly
	E3	The indoor coil temperature sensor	2. Sensor plug insert again	2. Reinsert
		the fault (TE)	3. Sensor is an open or short circuit	3. Replace the sensor
			4. The indoor unit control board malfunction	4. Replace the indoor unit control board
			1. Sensor separated from the coil	1. Refix the sensor correctly
	E2	The outdoor coil temperature	2. Sensor plug insert again	2. Reinsert
		sensor the fault (TW)	3. Sensor is an open or short circuit	3. Replace the sensor
			4. The outdoor unit control board malfunction	4. Replace the outdoor unit control board
		The outdoor ambient	1. Sensor directly contacts with the heat exchanger	1. Refix the sensor correctly
	E7		2. Sensor plug insert again	2. Reinsert
		temperature. Sensor
			3. Sensor is an open or short circuit	3. Replace the sensor
		abnormal (TL)
			4. the outdoor unit control board malfunction	4. Replace the outdoor unit control board
	E8	Discharge temperature	1. sensor separated from the copper tube	1. Refix the sensor correctly
		（Spenser the fault	2. Sensor plug insert again	2. Reinsert

 

			3. Sensor is an open or short circuit	3. Replace the sensor
			4. The outdoor unit control board malfunction	4. Replace the outdoor unit control board
			1. Refrigerant leak	1. Find out the leak point, repair the welding, refill the freon
	E11	Refrigerant lack protection/4-		unit after vacuuming it
			2. 4-way valve coil open or short circuit	2. Replace the 4-way valve coil
		way valve the fault protection
			3. Valve block cannot get the designated position or Valve blow-	3. Replace the 4-way valve
			by

 

 

 

 

 

 

Aux King Kong type Chiller AC Error Codes

Models: ACMK-H65/5, ACMK-H130/5

The fault	The fault code definition	possible cause	Solution
code
		1. The water flow switch and the power supply wires are not well connected	1. reconnect the wires firmly
		2. The water flow switch malfunction	2. Replace a normal water flow switch
E01	The water flow switch protection	3. Circulating the water pump malfunction	3. Repair or replace the circulating the water pump
		4. The water filter clogging	4. Clean or replace the water filter
		5. The evaporator tubes have a dirty plugging phenomenon	5. Clean the evaporator tubes
E05	The power supply phase sequence	1. Phase loss	1. reconnect the wires firmly
	protection	2. Phase dislocation	2. change the two-phase sequence of the power supply
	Return the water temperature	1. The temperature sensor broken	1. Replace the sensor
E07		2. Sensor plug insert again to PCB	2. Reconnect the sensor firmly
	sensor the fault
		3. Main control board malfunction	3. Replace the main control board
	The water outlet temperature sensor	1. The temperature sensor broken	1. Replace the sensor
E08		2. Sensor plug insert again to PCB	2. Reconnect the sensor firmly
	the fault
		3. Main control board malfunction	3. Replace the main control board
	The outdoor   ambient   temperature	1. The temperature sensor broken	1. Replace the sensor
E09		2. Sensor plug insert again to PCB	2. Reconnect the sensor firmly
	sensor the fault	3. Main control board malfunction	3. Replace the main control board
		1. The temperature sensor broken	1.  Replace the temperature sensor
E12	Anti-hyperthermal protection	2. Circulating the water pump malfunction	2. Repair or replace the circulating the water pump
	in heating mode	3. The water filter clogging	3.  Clean or replace the water filter
		4. The evaporator tubes have a dirty plugging phenomenon	4. Clean the evaporator tubes
	The water flow shortage protection	1. The return of the water temperature or the water inlet sensor broken	1.  Replace the temperature sensor
		2. The water filter clogging	2. Clean or replace the water filter
E13	(Chilled the water big temperature
		3. Circulating the water pump malfunction	3.  Repair or replace the circulating the water pump
	difference)
		4. The evaporator tubes have a dirty plugging phenomenon	4. Clean the evaporator tubes
		1. The connection plug loose	1. reconnect firmly
E15	Communication the fault between	2. Wired controller malfunction	2. replace a new one
	wired controller and PCB	3. The communication wire is an open or short circuit	3. replace a normal one
		4. Main control board malfunction	4. replace a new one
		1. The connection plug loose	1. reconnect firmly
	Communication the fault between	2. The communication wire between modules is a short circuit	2. replace a new one
E30		or open circuit
	different modules
		3. The communication wire is an open or short circuit	3. replace a normal one
		4. Main control board malfunction	4. replace a new one

 

	E18	Subsystem1#highpressure	1. the outdoor ventilation insufficient	1. Improve or enhance the ventilation
		protection	2. the outdoor fan blade broken	2. Replace the fan blade
			3. the connection between the fan blade and the outdoor the fan	3. Tighten or replace the sleeve
	E19	Subsystem 2#high pressure	motor loose
		protection	4. the outdoor fan stops working	4. Eliminate the malfunction cause
			5. the connection between the high-pressure switch and the main	5. Reconnect the wire plug to the main control board
		Subsystem 3#high pressure
	E20		control board lose
		protection	6. High-pressure switch malfunction	6. Replace the high-pressure switch
			7. the outdoor exchanger is dirty or sticky	7. Clean the heat exchanger
		Subsystem 4#high pressure
	E21		8. there are some airs in the refrigerant line	8. Refill the freon unit after vacuuming it
		protection	9. The capillary or the filter is blocked	9. Replace the capillary or filter
	E22	Subsystem 1#low pressure	1. Circulating the water pump malfunction	1. Repair it or change a normal one
				2. Clean the water filter
		protection	2. The water filter clogging
				3. Clean the evaporator tubes
	E23	Subsystem 2#low pressure	3. The evaporator tubes have a dirty plugging phenomenon
			4. The connection between the low-pressure switch and the main
		protection		4. Reconnect the wire to the main control board
			control board lose
		Subsystem 3#low pressure
	E24		5. Low-pressure switch malfunction	5. Replace the low-pressure switch
		protection	6. Refrigerant leak
				6. Find out the leak point, repair the welding, refill the freon unit
		Subsystem 4#low pressure
	E25		7. The capillary or the filter is blocked	after vacuuming it
		protection
				7. Replace the capillary or filter
		Subsystem 1# air discharge	1. the outdoor ventilation insufficient	1. Improve or enhance the ventilation
			2. the outdoor fan blade broken	2. Replace the fan blade
	E26	temperature overhigh
		protection	3. the connection between the fan blade and the outdoor the fan	3. Tighten or replace the sleeve
			motor loose
		Subsystem 2# air discharge
	E27		4. the outdoor fan stops working	4. Eliminate the malfunction cause
		temperature overhigh	5. the connection between the discharge temperature sensor	5. Reconnect the wire plug to the main control board
		protection
			and the main control board lose
		Subsystem 3# air discharge	6. the outdoor exchanger is dirty or sticky	6. Clean the heat exchanger
			7. discharge temperature sensor deviation	7. Replace the sensor
	E28	temperature overhigh
			8. Refrigerant leak	8. Find out the leak point, repair the welding, refill the freon unit
		protection
				after vacuuming it
		Subsystem 4# air discharge	9. The indoor capillary or the filter is blocked
				9. Replace the capillary or filter
	E29	temperature overhigh	10. there are some airs in the refrigerant line	10. Find out the leak point, repair the welding, refill the freon
		protection		unit after vacuuming it
			1. the water outlet temperature sensor malfunction	1. Replace a normal one
			2. Circulating the water pump malfunction	2. Repair it or change a normal one
	E33	Anti-freezing protection in	3. The water filter clogging	3. Clean the water filter
		cooling mode	4. The evaporator tubes have a dirty plugging phenomenon	4. Clean the evaporator tubes
			5. Refrigerant leak	5. Find out the leak point, repair the welding, refill the freon unit
				after vacuuming it

 

E34	Subsystem 1# the compressor	1. The outdoor ventilation insufficient	1. Improve or enhance the ventilation
	overcurrent protection		2. Tighten or replace the sleeve
		2. The connection between the fan blade and the outdoor the fan
	Subsystem 2# the compressor
E35		motor loose	3. Eliminate the malfunction cause
	overcurrent protection	3. the outdoor fan stops working
			4. Replace the fan blade
		4. The outdoor fan blade broken
	Subsystem 3# the compressor
E36			5. Clean the heat exchanger
		5. The outdoor exchanger is dirty or sticky
	overcurrent protection		6. Replace the capillary or filter
		6. Pipeline ice blocking or dirty
	Subsystem 4# the compressor		7. Release some refrigerant
E37		7. Refrigerant overcharged
	overcurrent protection
E38	Subsystem 1# 4-way valve the fault	1. 4-way valve coil open or short circuit	1. Replace valve coil
		2. Valve block cannot get the designated position or Valve	2. Replace valve body
E39	Subsystem 2# 4-way valve the fault
		blow-by
E40	Subsystem 3# 4-way valve the fault	3. The outdoor ambient temperature sensor or exchanger coil	3. Replace a normal one
		temperature sensor malfunction
E41	Subsystem 4# 4-way valve the fault
		4. The main PCB failure	4. Replace the main PCB board
E42	Subsystem 1# discharge
	temperature sensor the fault
E43	Subsystem 2# discharge	1. Sensor is an open or short circuit	1. Replace the sensor
	temperature sensor the fault
		2. Sensor plug insert again	2. Reinsert firmly
	Subsystem 3# discharge
E44		3. Main control board malfunction	3. Replace the main control board
	temperature sensor the fault
E45	Subsystem 4# discharge
	temperature sensor the fault
E46	Subsystem 1# exchanger coil
	temperature sensor the fault
E47	Subsystem 2# exchanger coil	1. Sensor is an open or short circuit	1. Replace the sensor
	temperature sensor the fault
		2. Sensor plug insert again	2. Reinsert firmly
	Subsystem 3# exchanger coil
E48		3. Main control board malfunction	3. Replace the main control board
	temperature sensor the fault
E49	Subsystem 4# exchanger coil
	temperature sensor the fault
E53	Module type dip switch setting	Module type dip switch setting incorrect	Reset the Module type dip switch setting concerning the
	incorrect		wiring diagram
E54	Module address repeat	Module address dip switch setting incorrect	reset address setting dip switch concerning wiring
			diagram as needed

 

 

 

Aux X type Chiller AC Error Codes

Models: ACMX-H65/5, ACMX-H95/5, ACMX-H130/5, ACMX-H65/5R1

the fault code	the fault code definition	possible cause	Solution
		1 、 The water flow switch and the power supply wires are not well	1. reconnect the wires firmly
		connected	2. Replace a normal water flow switch
E01		2. The water flow switch malfunction
	The water flow switch protection		3. Repair or replace the circulating the water pump
		3. Circulating the water pump malfunction
			4. Clean or replace the water filter
		4. The water filter clogging
			5. Clean the evaporator tubes
		5. The evaporator tubes have a dirty plugging phenomenon
E03	The outdoor fan NO1.  &NO3. overload	1. The outdoor unit ventilation insufficient	1. Improve or enhance the ventilation
	protection
E04	The outdoor fan NO2.  overload protection	2. The fan motor stuck	2. Replace the fan motor
E05	Input the power supply phase sequence	1. Phase loss	1. reconnect the wires firmly
	protection	2. Phase dislocation	2. change the two-phase sequence of the power supply
E07	Return the water temperature to the fault	1. The temperature sensor broken	1. Replace the sensor
		2. Sensor plug insert again to PCB	2. Reconnect the sensor firmly
		3. Main control board malfunction	3. Replace the main control board
E08	The water outlet temperature is the fault	1. The temperature sensor broken	1. Replace the sensor
		2. Sensor plug insert again to PCB	2. Reconnect the sensor firmly
		3. Main control board malfunction	3. Replace the main control board
		1. The temperature sensor broken	1.  Replace the temperature sensor
			2. Repair or replace the circulating the water pump
E12	Anti-hyperthermal protection	2. Circulating the water pump malfunction
			3.  Clean or replace the water filter
	in heating mode	3. The water filter clogging
			4. Clean the evaporator tubes
		4. The evaporator tubes have a dirty plugging phenomenon
		1 The return of the water temperature or the water inlet sensor	1.  Replace the temperature sensor
	The water flow shortage protection	broken	2. Clean or replace the water filter
E13		2. The water filter clogging	3.  Repair or replace the circulating the water pump
	(Chilled the water big temperature difference)
		3. Circulating the water pump malfunction	4. Clean the evaporator tubes
		4. The evaporator tubes have a dirty plugging phenomenon
		1. The connection plug loose	1. Reconnect firmly
E15	Communication the fault between wired	2. Wired controller malfunction	2. Replace a new one
	controller and PCB	3. The communication wire is an open or short circuit	3. Replace a normal one
		4. Main control board malfunction	4. Replace a new one
E16	Circulating the water anti-freezing protection	1.  The outdoor ambient temperature is too low	1. Start the heating mode
	in winter	2. The outdoor ambient temperature sensor malfunction	2. Replace The outdoor ambient temperature sensor

 

			1. The outdoor ventilation insufficient	1. Improve or enhance the ventilation
E26		High discharge temperature protection of	2. The outdoor fan blade broken	2. Replace the fan blade
		the compressor 1#	3. The connection between the fan blade and the outdoor the fan	3. Tighten or replace the sleeve
			motor loose
			4. The outdoor fan stops working	4. Eliminate the malfunction cause
			5. The connection between the discharge temperature sensor	5. Reconnect the wire plug to the main control board
E27		High discharge temperature protection of	and the main control board lose
		the compressor 2#	6. The outdoor exchanger is dirty or sticky	6. Clean the heat exchanger
			7. Discharge temperature sensor deviation	7. Replace the sensor
			8. Refrigerant leak	8. Find out the leak point, repair the welding, refill
		High discharge temperature protection of		unit after vacuuming it
E28			9. The indoor capillary or the filter is blocked	9. Replace the capillary or filter
		the compressor 3#	10. There are some airs in the refrigerant line	10. Find out the leak point, repair the welding, refill
				the unit after vacuuming it
			1. The connection plug loose	1. Reconnect firmly
E30		Communication the fault between different	2. The communication wire between modules is short	2. Replace a new one
			circuit or open circuit
		modules
			3. The communication wire is an open or short circuit	3. Replace a normal one
			4. Main control board malfunction	4. Replace a new one
			1. The water outlet temperature sensor malfunction	1. Replace a normal one
				2. Repair it or change a normal one
			2. Circulating the water pump malfunction
E33				3. Clean the water filter
		Anti-freezing protection in cooling mode	3. The water filter clogging
				4. Clean the evaporator tubes
			4. The evaporator tubes have a dirty plugging phenomenon
			5. Refrigerant leak	5. Find out the leak point, repair the welding, refill the freon
				unit after vacuuming it
E34		Over-current protection of the compressor 1#	1. The outdoor ventilation insufficient	1. Improve or enhance the ventilation
				2. Tighten or replace the sleeve
			2. The connection between the fan blade and the outdoor the fan
			motor loose	3. Eliminate the malfunction cause
			3. The outdoor fan stops working
E35		Over-current protection of the compressor 2#		4. Replace the fan blade
			4. The outdoor fan blade broken
			5. The outdoor exchanger is dirty or sticky	5. Clean the heat exchanger
				6. Replace the capillary or filter
			6. Pipeline ice blocking or dirty
E36		Over-current protection of the compressor 3#		7. Release some refrigerant
			7. Refrigerant overcharged
			1. 4-way valve coil open or short circuit	1. Replace valve coil
			2. Valve block cannot get the designated position or Valve	2. Replace valve body
E38		The four-way valve malfunction	blow-by
			3. The outdoor ambient temperature sensor malfunction or	3. Replace a normal one
			exchanger coil temperature sensor
			4. The main PCB failure	4. Replace the main PCB board

 

			1. The outdoor ventilation insufficient	1. Improve or enhance the ventilation
			2. The outdoor fan blade broken	2. Replace the fan blade
			3. The connection between the fan blade and the outdoor the fan	3. Tighten or replace the sleeve
			motor loose
	E39		4. The outdoor fan stops working	4. Eliminate the malfunction cause
		High-pressure protection	5. The connection between the high-pressure switch and the main	5. Reconnect the wire plug to the main control board
			control board lose
			6. High-pressure switch malfunction	6. Replace the high-pressure switch
			7. The outdoor exchanger is dirty or sticky	7. Clean the heat exchanger
			8. There are some airs in the refrigerant line	8. Refill the freon unit after vacuuming it
			9. The capillary or the filter is blocked	9. Replace the capillary or filter
			1. Circulating the water pump malfunction	1. Repair it or change a normal one
			2. The water filter clogging	2. Clean the water filter
			3. The evaporator tubes have a dirty plugging phenomenon	3. Clean the evaporator tubes
	E40	Low-pressure protection	4. The connection between the low-pressure switch and the main	4. Reconnect the wire to the main control board
			control board lose
			5. Low-pressure switch malfunction	5. Replace the low-pressure switch
			6. Refrigerant leak	6. Find out the leak point, repair the welding, refill the freon
				unit after vacuuming it
			7. The capillary or the filter is blocked	7. Replace the capillary or filter
			1. Sensor is an open or short circuit	1. Replace the sensor
	E41	Exchanger coil bottom temperature	2. Sensor separates from the copper tube	2. Refix the sensor correctly
		sensor the fault	3. Sensor plug insert again	3. Reinsert firmly
			4. Main control board malfunction	4. Replace the main control board
	E42	Discharge temperature sensor the fault of	1. Sensor is an open or short circuit	1. Replace the sensor
		the compressor 1#
			2. Sensor separates from the copper tube	2. Refix the sensor correctly
	E43	Discharge temperature sensor the fault of
		the compressor 2#	3. Sensor plug insert again	3. Reinsert firmly
	E44	Discharge temperature sensor the fault of	4. Main control board malfunction	4. Replace the main control board
		the compressor 3#
			1. Sensor is an open or short circuit	1. Replace the sensor
	E50	Suction temperature sensor the fault	2. Sensor separates from the copper tube	2. Refix the sensor correctly
			3. Sensor plug insert again	3. Reinsert firmly
			4. Main control board malfunction	4. Replace the main control board
			1. Sensor is an open or short circuit	1. Replace the sensor
	E51	Evaporator temperature sensor the fault	2. Sensor separates from the copper tube	2. Refix the sensor correctly
			3. Sensor plug insert again	3. Reinsert firmly
			4. Main control board malfunction	4. Replace the main control board
	E52		1. The outdoor ventilation insufficient	1. Improve or enhance the ventilation
		Cooling overload protection		2. Replace the fan blade
			2. The outdoor fan blade broken
				3. Tighten or replace the sleeve

 

		3. The connection between the fan blade and the outdoor the fan	4. Eliminate the malfunction cause
		motor loose
		4. The outdoor fan stops working	5. Replace the sensor
		5. Exchanger coil bottom temperature sensor malfunction	6. Clean the heat exchanger
		6. The outdoor exchanger is dirty or sticky	7. Refill the freon unit after vacuuming it
		7.  There are some airs in the refrigerant line	8. Replace the capillary or filter
		8. The capillary or the filter is blocked
E53	Module type dip switch setting incorrect	Module type dip switch setting incorrect	Reset Module type dip switch setting with reference
			to the wiring diagram
E54	Module address repeat	Module address dip switch setting incorrect	Reset address setting dip switch concerning
			wiring diagram as needed

 

 

 

Aux Mini Chiller AC Error Codes

Models: ACMI-H12/4, ACMI-H16/5, ACMI-H28/5, ACMI-H42/5

The fault				The fault code definition	Possible cause	solution
code
					1. The connection plug loose	1. Reconnect firmly
Eon	：	00		Communication the fault	2. The communication wire is an open or short circuit	2. Replace a normal one
					3. Main control board malfunction	3. Replace a new one
					1 、 The water flow switch and the power supply wires are not well	1. reconnect the wires firmly
					connected
Eon	：	01		The water flow switch protection	2. The water flow switch malfunction	2. Replace a normal water flow switch
					3. Circulating the water pump malfunction	3. Repair or replace the circulating the water pump
					4. The water filter clogging	4. Clean or replace the water filter
					5. The evaporator tubes have a dirty plugging phenomenon	5. Clean the evaporator tubes
Eo：02				The outdoor the fan motor overload	1. The outdoor unit ventilation insufficient	1. Improve or enhance the ventilation
					2. The fan motor stuck	2. Replace the fan motor
Eo：03				Input the power supply phase sequence	1. Phase loss	1. reconnect the wires firmly
				protection	2. Phase dislocation	2. change the two-phase sequence of the power supply
					1 The return of the water temperature or the water inlet sensor	1.  Replace the temperature sensor
				The water flow shortage protection	broken	2. Clean or replace the water filter
Eo：04					2. The water filter clogging	3.  Repair or replace the circulating the water pump
				(Chilled the water big temperature difference)
					3. Circulating the water pump malfunction	4. Clean the evaporator tubes
					4. The evaporator tubes have a dirty plugging phenomenon
Eo：06				Freezing point protection switch	The freezing point protection switch is off	Press the reset key to reset
					1. The temperature sensor broken	1.  Replace the temperature sensor
Eo：07				Anti-hyperthermal protection	2. Circulating the water pump malfunction	2. Repair or replace the circulating the water pump
				in heating mode	3. The water filter clogging	3.  Clean or replace the water filter
					4. The evaporator tubes have a dirty plugging phenomenon	4. Clean the evaporator tubes
				High discharge temperature protection of	1. The outdoor ventilation insufficient	1. Improve or enhance the ventilation
Er：03					2. The outdoor fan blade broken	2. Replace the fan blade
				subsystem 1#	3. The connection between the fan blade and the outdoor the fan	3. Tighten or replace the sleeve
					motor loose

 

			4. The outdoor fan stops working	4. Eliminate the malfunction cause
			5 、 The connection between discharge temperature	5. Reconnect the wire plug to the main control board
			sensor and main control board lose
		High discharge temperature protection of	6. The outdoor exchanger is dirty or sticky	6. Clean the heat exchanger
Er：13			7. Discharge temperature sensor deviation	7. Replace the sensor
		subsystem 2#	8. Refrigerant leak	8. Find out the leak point, repair the welding, refill
				the unit after vacuuming it
			9. The indoor capillary or the filter is blocked	9. Replace the capillary or filter
			10. There are some airs in the refrigerant line	10. Find out the leak point, repair the welding, refill
				the unit after vacuuming it
			1. The outdoor ventilation insufficient	1. Improve or enhance the ventilation
			2. The outdoor fan blade broken	2. Replace the fan blade
		High-pressure protection of subsystem 1#	3. The connection between the fan blade and the outdoor the fan	3. Tighten or replace the sleeve
：			motor loose
Er 04
			4. The outdoor fan stops working	4. Eliminate the malfunction cause
			5. The connection between the high-pressure switch and	5. Reconnect the wire plug to the main control board
			main control board lose
			6. High-pressure switch malfunction	6. Replace the high-pressure switch
Er：14		High-pressure protection of subsystem 2#	7. The outdoor exchanger is dirty or sticky	7. Clean the heat exchanger
			8. There are some airs in the refrigerant line	8. Refill the freon unit after vacuuming it
			9. The capillary or the filter is blocked	9. Replace the capillary or filter
			1. Circulating the water pump malfunction	1. Repair it or change a normal one
Er：05		low suction pressure protection of	2. The water filter clogging	2. Clean the water filter
		Subsystem 1#	3. The evaporator tubes have a dirty plugging phenomenon	3. Clean the evaporator tubes
			4. The connection between the low-pressure switch and the main	4. Reconnect the wire to the main control board
			control board lose
		low suction pressure protection of	5. Low-pressure switch malfunction	5. Replace the low-pressure switch
Er：15			6. Refrigerant leak	6. Find out the leak point, repair the welding, refill
		Subsystem 2#		the unit after vacuuming it
			7. The capillary or the filter is blocked	7. Replace the capillary or filter
			1. The temperature sensor broken	1. Replace the sensor
：	01	Return the water temperature to the fault	2. Sensor plug insert again to PCB	2. Reconnect the sensor firmly
Po			3. Main control board malfunction	3. Replace the main control board
		The outdoor ambient temperature sensor	1. The temperature sensor broken	1. Replace the sensor
：	02		2. Sensor plug insert again to PCB	2. Reconnect the sensor firmly
Po		the fault	3. Main control board malfunction	3. Replace the main control board

 

 

			1. The water outlet temperature sensor malfunction	1. Replace a normal one
				2. Repair it or change a normal one
			2. Circulating the water pump malfunction
				3. Clean the water filter
：	03	Anti-freezing protection in cooling mode	3. The water filter clogging
Po			4. The evaporator tubes have a dirty plugging phenomenon	4. Clean the evaporator tubes
			5. Refrigerant leak	5. Find out the leak point, repair the welding, refill
				the unit after vacuuming it
			1. The temperature sensor broken	1. Replace the sensor
：	06	The water outlet temperature is the fault	2. Sensor plug insert again to PCB	2. Reconnect the sensor firmly
Po			3. Main control board malfunction	3. Replace the main control board
：	07	Circulating the water anti-freezing protection in	The outdoor ambient temperature is too low	Start the heating mode
Po		winter
Pr：02		Exchanger coil temperature sensor the fault of	1. Sensor is an open or short circuit	1. Replace the sensor
		subsystem 1#	2. Sensor separated from the copper tube	2. Refix the sensor correctly
Pr：12		Exchanger coil temperature sensor the fault of	3. Sensor plug insert again	3. Reinsert firmly
		subsystem 2#	4. Main control board malfunction	4. Replace the main control board
Pr：03		Discharge temperature sensor the fault of	1. Sensor is an open or short circuit	1. Replace the sensor
		subsystem 1#	2. Sensor separates from the copper tube	2. Refix the sensor correctly
Pr：13		Discharge temperature sensor the fault of	3. Sensor plug insert again	3. Reinsert firmly
			4. Main control board malfunction	4. Replace the main control board
		subsystem 2#
			1. The outdoor ventilation insufficient	1. Improve or enhance the ventilation
Pr：04		Cooling overload protection of subsystem	2. The outdoor fan blade broken	2. Replace the fan blade
		1#	3. The connection between the fan blade and the outdoor the fan	3. Tighten or replace the sleeve
			motor loose
			4. The outdoor fan stops working	4. Eliminate the malfunction cause
			5. Exchanger coil bottom temperature sensor malfunction	5. Replace the sensor
Pr：14		Cooling overload protection of subsystem	6. The outdoor exchanger is dirty or sticky	6. Clean the heat exchanger
		2#	7.  There are some airs in the refrigerant line	7. Refill the freon unit after vacuuming it
			8. The capillary or the filter is blocked	8. Replace the capillary or filter

 

 

Aux Package AC Error Codes

Models: ART-C50/9, ART-C75/9, ART-C100/9, ART-C125/9, ART-C150/9, ART-C200/9

The fault	The fault code definition	Possible cause	Solution
code
		1. The connection loose	1. Reconnect firmly
E5	Wired controller	2. Wired controller malfunction	2. Replace a new one
	communication the fault	3. The communication wire is an open or short circuit	3. Replace a normal one
		4. The indoor unit control board malfunction	4. Replace a new one
	Input the power supply phase	1. Phase loss	1. Reconnect the wires firmly
E6		2. Low-voltage	2. Check if the power supply is consistent with the
	sequence protection		nameplate
	（The outdoor unit）	3. Phase dislocation	3. Exchange the two-phase sequence of the power
			supply
		1. The outdoor fan blade broken	1. Replace the fan blade
		2. The connection between the fan blade and the outdoor the fan motor	2. Tighten or replace the sleeve
		loose
		3. The outdoor fan stops working	3. Eliminate the malfunction cause
F2	Discharge temperature	4. The outdoor ventilation insufficient	4. Improve or enhance the ventilation
	protection	5. The outdoor exchanger is dirty or sticky	5. Clean the heat exchanger
		6. Discharge temperature sensor deviation	6. Replace the sensor
		7. Refrigerant leak	7. Find out the leak point, repair the welding, refill the freon
			unit after vacuuming it
		8. The capillary or the filter is blocked	8. Replace the capillary or filter
		1. The globe valve is closed	1. Open the globe valve
		2. The outdoor fan blade broken	2. Replace the fan blade
		3. The connection between the fan blade and the outdoor the fan motor	3. Tighten or replace the sleeve
		loose
		4. The outdoor fan stops working	4. Eliminate the malfunction cause
EH	High-pressure protection	5. The outdoor ventilation insufficient	5. Improve or enhance the ventilation
		6. The connection between the high-pressure switch and the control	6. Reconnect the wire to the control board
		board loose
		7. High-pressure switch malfunction	7. Replace the high-pressure switch
		8. The outdoor exchanger is dirty or sticky	8. Clean the heat exchanger
		9. There are some moistures in the refrigerant line	9. Refill the freon unit after vacuuming it
		10. The capillary or the filter is blocked	10. Replace the capillary or filter
		1. The globe valve is closed	1. open the globe valve
EL	Low-pressure protection	2. The indoor fan blade broken	2. tighten or replace the sleeve
		3. The connection between the fan blade and the indoor the fan motor	3. the indoor fan blade broken
		loose

 

			4. The outdoor fan stops working	4. Eliminate the malfunction cause
			5. Filter net is dirty	5. Clean the filter
			6. Refrigerant leak	6. Find out the leak point, repair the welding, refill the freon
				unit after vacuuming it
			7. The connection between the low-pressure switch and the control board	7. Reconnect the wire to the control board
			loose
			8. Low-pressure switch malfunction	8. Replace the low-pressure switch
			9. The capillary or the filter is blocked	9. Replace the capillary or filter
			1. Sensor directly contacts with the heat exchanger	1. Refix the sensor correctly
	E1	The indoor ambient temperature	2. Sensor plug insert again	2. Reinsert
		sensor the fault	3. Sensor is an open or short circuit	3. Replace the sensor
			4. The indoor unit control board malfunction	4. Replace the indoor unit control board
			1. Sensor separated from the coil	1. Refix the sensor correctly
	E3	The indoor coil temperature sensor	2. Sensor plug insert again	2. Reinsert
		the fault (TE)	3. Sensor is an open or short circuit	3. Replace the sensor
			4. The indoor unit control board malfunction	4. Replace the indoor unit control board
			1. Sensor separated from the coil	1. Refix the sensor correctly
	E2	The outdoor coil temperature	2. Sensor plug insert again	2. Reinsert
		sensor the fault (TW)	3. Sensor is an open or short circuit	3. Replace the sensor
			4. The outdoor unit control board malfunction	4. Replace the outdoor unit control board
			1. Sensor separated from the copper tube	1. Refix the sensor correctly
	E8	Discharge temperature （TP）	2. Sensor plug insert again	2. Reinsert
		sensor the fault	3. Sensor is an open or short circuit	3. Replace the sensor
			4. The outdoor unit control board malfunction	4. Replace the outdoor unit control board
		The outdoor ambient	1. Sensor directly contacts with the heat exchanger	1. Refix the sensor correctly
	E7		2. Sensor plug insert again	2. Reinsert
		temperature. Sensor
			3. Sensor is an open or short circuit	3. Replace the sensor
		abnormal (TL)
			4. The outdoor unit control board malfunction	4. Replace the outdoor unit control board

 

 

 

Aux Mini ARV Ⅱ AC Error Codes

	The fault	The fault code definition	Possible cause	Solution
	code
		The indoor ambient temperature sensor	1. Temperature sensor broken	1. Replace the sensor
	A1		2. Sensor connection is not well connection	2. Reconnect the sensor firmly
		the fault
			3. The outdoor main control board is broken	3. Replace the outdoor main control board
		The middle position of the indoor exchanger	1. Temperature sensor broken	1. Replace the sensor
	A2		2. Sensor connection is incorrect.	2. Reconnect the sensor firmly
		temperature sensor the fault
			3. The outdoor main control board is broken	3. Replace the outdoor main control board
		The indoor heat exchanger inlet	1. Temperature sensor broken, or exceed test limit	1. Replace the sensor
	A3		2. Sensor connection is incorrect.	2. Reconnect the sensor firmly
		temperature sensor the fault
			3. The outdoor main control board is broken	3. Replace the outdoor main control board
		The indoor coil pipe outlet temperature	1. Temperature sensor broken, or exceed test limit	1. Replace the sensor
	A4		2. Sensor connection is incorrect.	2. Reconnect the sensor firmly
		sensor failure
			3. The outdoor main control board is broken	3. Replace the outdoor main control board
			1. Drain pipe is blocked	1. Clean the drain pipe
			2. Float switch short-circuit or unconnected	2. Repace the float switch or reconnect it
	A5	The indoor unit drainage system the fault	3. The power line of the water pump loose	3. Reconnect the power line of the water pump
			4. The water pump is broken	4. Replace the water pump
			3. The outdoor main control board is broken	5. Replace PCB
			1. The fan motor is an open or short-circuit	1. Replace the fan motor
	A6	The indoor PG the fan the fault	2. The connection between the main control board and the fan motor	2. Reconnect firmly
			loose.
			3. The fan motor gets stuck	3. Replace the fan motor
		Reversible synchronous motor	1.  Step motor failure	1. Replace the step motor
	A7		2. The connection between the main control board and the fan motor
		malfunction		2. Reconnect firmly
			loose.
			1. EEPROM communication failure
			2. EEPROM data validation error (model identification,
	A8	The indoor unit EEPROM module failure	calibration, etc.)	Replace the indoor unit EEPROM module
			3. EEPROM data logic errors (superkingdom data range, order,
			etc.)
			1. The outdoor unit is the power off	1. Turn on the power for the outdoor unit
			2. The communication wire plug of units lost	2. Loosen and insert the right plug
		The communication the fault between	3. The indoor unit the power off	3. Turn on the power for the indoor unit
	A9		4. The communication wire is an open or short circuit	4. Replace a normal communication wire
		the indoor unit and the outdoor unit
			5. The indoor unit control board malfunction	5. Replace the control board
			6. The outdoor unit control board malfunction	6. Replace the control board
			7. electromagnetic interference	7. Add electromagnet loop

 

	AE	Operation mode conflict	Some of the indoor unit’s operation mode setting cooling， but some			Reset the indoor unit operating mode uniformly
			the indoor units’ operation mode setting heating
	AH(AB)	Two or more of the indoor unit address	The indoor unit address setting incorrect			Reset the indoor unit address
		repeat
			1. The blower motor is an open or short circuit			1. Replace the blower motor
			2. The blower impeller is broken			2. Replace the blower impeller
	AJ	The indoor coil anti-freezing protection	3. Sensor directly contacts with the heat exchanger			3 、 Refix the heat exchanger temperature
			4. The filter net is too dirty			sensor
						4. Clean the filter net
			1. EXV is blocked			1. Clean the EXV
	AF	The indoor EXV is the fault	2. The EXV leak			2. Replace the EXV
			3. The indoor unit temperature sensor malfunctioned.			3. Replace The indoor unit temperature sensor
			4. Evaporator inlet sensor failure.			4. Replace the evaporator inlet sensor
		Ambient temperature sensor “Tao”	1. Temperature sensor broken			1. Replace the sensor
	C1		2. Sensor connection is incorrect.			2. Reconnect the sensor firmly
		the fault
			3. The outdoor PCB is broken			3. Replace the outdoor main control board
		Defrosting temperature sensor	1. Temperature sensor broken			1. Replace the sensor
	C2		2. Sensor connection is incorrect.			2. Reconnect the sensor firmly
		“Tdef1” the fault
			3. The outdoor PCB is broken			3. Replace the outdoor main control board
		The discharge temperature sensor of	1. Temperature sensor broken			1. Replace the sensor
	C3	variable frequency the compressor “Tri”	2. Sensor connection is incorrect.			2. Reconnect the sensor firmly
		the fault	3. The outdoor PCB is broken			3. Replace the outdoor main control board
		The discharge temperature sensor of	1. Temperature sensor broken			1. Replace the sensor
	C4	fixed frequency the compressor No.1	2. Sensor connection is incorrect.			2. Reconnect the sensor firmly
		“Td1” the fault	3. The outdoor PCB is broken			3. Replace the outdoor main control board
		The discharge temperature sensor of	1. Temperature sensor broken			1. Replace the sensor
	C5	fixed frequency the compressor No.2	2. Sensor connection is incorrect.			2. Reconnect the sensor firmly
		“Td2” the fault	3. The outdoor PCB is broken			3. Replace the outdoor main control board
		Suction pipe temperature sensor of	1. Temperature sensor broken			1. Replace the sensor
	C6	fixed frequency of the compressor	2. Sensor connection is incorrect.			2. Reconnect the sensor firmly
		the compressor “Ts” is the fault	3. The outdoor PCB is broken			3. Replace the outdoor main control board
		Suction pipe temperature sensor of	1. Temperature sensor broken			1. Replace the sensor
	C7	variable frequency the compressor “Tso”	2. Sensor connection is incorrect.			2. Reconnect the sensor firmly
		the fault	3. The outdoor PCB is broken			3. Replace the outdoor main control board
		The outdoor unit condenser middle	1. Temperature sensor broken			1. Replace the sensor
	C8		2. Sensor connection is incorrect.			2. Reconnect the sensor firmly
		position sensor “Tc” the fault
			3. The outdoor PCB is broken			3. Replace the outdoor main control board
		Suction pipe temperature sensor of	1. Temperature sensor broken			1. Replace the sensor
	C9	variable frequency the compressor “Tso”	2. Sensor connection is incorrect.			2. Reconnect the sensor firmly
		the fault	3. The outdoor PCB is broken			3. Replace the outdoor main control board

 

			1. 4-way valve coil open or short circuit		1. Replace valve coil
					2. Replace valve body
			2. Valve block cannot get the designated position or Valve
	E1	4-way valve the fault	blow-by		3. Reconnect correctly
			3. The connection of the 4-way valve and the main PCB incorrect
			4. The main PCB failure		4. Replace PCB
			1. EXV open degree is small
			2. The outdoor exchanger is dirty or sticky
			3. The outdoor ventilation insufficient
			4. EXV blocked
		DC inverter the compressor discharge	5. Refrigerant filter blocked
	E3		6. Gas pipe stop valve closed
		temperature “Tri” protection
			7. Liquid pipe stop valve closed
			8. System exhaust sensor the fault
			9. System lack refrigerant
			10. The outdoor unit PCB the fault
			11.  DC inverter the compressor the fault
			1. EXV open degree is small
		Fixed frequency of the compressor	2. The outdoor exchanger is dirty or sticky
			3. The outdoor ventilation insufficient
	E4	NO1. discharge temperature “Td1”
			4. EXV blocked
		protection (shut down)
			5. Refrigerant filter blocked
			6. Gas pipe stop valve closed
			7. Liquid pipe stop valve closed
	E5	Fixed frequency of the compressor NO2	8. System exhaust sensor the fault
		discharge temperature “Td2”	9. System lack refrigerant
		protection (shut down)	10. The outdoor unit PCB the fault
			11.  Fixed frequency of the compressor the fault
		Limit frequency protection caused by	1. The compressor rotation speed is too high
			2. The outdoor ambient temperature is too high
	E7	the middle position of the condenser
			3. Refrigerant overcharge
		Temperature too high
			4. The outdoor exchanger is dirty or sticky
			1. The outdoor exchanger is dirty or sticky
		Condenser middle position	2. The outdoor ambient temperature is too high
			3. The pipe from the condenser to the exhaust port block
	E8	Temperature sensor “Tc” protection
			4. The outdoor unit the fan motor stop or low speed
		(Shut down)
			5. Refrigerant overcharge
			6. Oil temperature is too low
	H1(B1)	high-pressure protection	1. The outdoor ventilation insufficient		1. Improve or enhance the ventilation
			2. The outdoor fan blade broken		2. Replace the fan blade

 

			3. The connection between the fan blade and the outdoor the fan motor		3. Tighten or replace the sleeve
			loose
			4. The outdoor fan stops working		4. Eliminate the malfunction cause
			5. The connection between the high-pressure switch and the main control		5 、Reconnect the wire plug to the main control
			board loose		board
			6. High-pressure switch malfunction		6. Replace the high-pressure switch
			7. The outdoor exchanger is dirty or sticky		7. Clean the heat exchanger
			8. There are some airs in the refrigerant line		8. Refill the freon unit after vacuuming it
			9. The capillary or the filter is blocked		9. Replace the capillary or filter
			10. Instantaneous the power-off		10. Restart the unit
			1. Refrigerant leak		1 、 Find   out   the   leak   point, repair   the
			2. Low-pressure switch failure		welding, refill the freon unit after vacuuming it
			3. Instantaneous the power-off		2. Replace the low-pressure switch
	H4(B4)	Low-pressure protection	4. Stop valve closed		3. Restart the unit
			5. In cooling mode the indoor unit EXV close or block		4. open the stop valve
			6. In heating mode the outdoor unit EXV close or block		5. Refill the freon unit after vacuuming it
			7. In heating mode the outdoor unit the fan stop		6. Refill the freon unit after vacuuming it
			8. In heating mode the outdoor unit air outlet block
	H6(B6)	DC inverter the compressor over-current	1. The outdoor unit the fan motor malfunction		1. Replace the fan motor
		limit frequency protection	2. The outdoor ventilation insufficient
					2. Improve or enhance the ventilation
		DC inverter the compressor overload
	H7(B7)		3. The power supply incorrect		3. Change the power supply
		shutdown protection
		Fix the speed of the compressor 1 overcurrent	1. The stop valve closed		1. Open the stop valve
	H8(B8)		2. The outdoor ventilation insufficient
					2. Improve or enhance the ventilation
		protection	3. System supplies the power voltage exceeds the limit (Rated voltage
					3. Install a voltage stabilizer
			15%)
		Fix the speed of the compressor 2 overcurrent			4. Replace the compressor
	H9(B9)		4. The compressor failure
					5. Replace replace the compressor
		protection	5. Replace the compressor failure
			1. System supply the power voltage exceeds the limit (Rated voltage 15%)		1. Install a voltage stabilizer
	HA(BA)	Input the power supply overvoltage	2. Instantaneous the power-off		2. Restart the unit
		&undervoltage protection	3. Electrical wiring incorrect		3. Reconnect
			4. Main control board malfunction		4. Replace the main control board
	HC(BB)	Input the power supply phase dislocation	1.  Input the power supply phase dislocation		1. Exchange two-phase sequence of the Input
		protection			the power supply
			2. The outdoor unit PCB failure		2. Replace the outdoor unit PCB
			1. The communication wire between the outdoor units is short		1. Replace the communication wire
			circuit or connect incorrectly.
		The communication the fault between			2. Replace the main control board
	J1(D1)		2. The outdoor unit main control board failure
		the outdoor units			3. Reset the outdoor unit quantity setting dip switch
			3. The outdoor unit quantity setting incorrect
					4. The power on the outdoor unit’s main power
			4. The outdoor unit main power failed
			32

 

			1. The communication wire between the indoor unit and the outdoor		1. Replace the communication wire
		The communication the fault between	unit open circuit, short circuit, or connect incorrectly.
	J2(D2)				2. the power on the indoor unit
		the outdoor unit and the indoor unit	2. The indoor unit the power off
					3. Replace the indoor unit PCB
			3. The indoor unit PCB failure
			1. The connection between the driving module and the main PCB		1. Replace the communication wire
			failure
		The communication the fault between			2. Replace control PCB
	J3(D3)		2. The communication part of the outdoor unit control PCB failure
		control board and INV module			3. Replace the Frequency of the diving board
			3. Frequency of the driving board failure
					4. Replace INV with the compressor
			4. INV the compressor failure
			1. The communication wire is an open circuit or short circuit		1. Replace the communication wire
	J4(D4)	The communication the fault between	2. The communication part of the outdoor unit control PCB failure		2. Replace control PCB
		control board and the fan the driving module	3. The fan the driving module failure		3. Replace the fan with the driving module
			4. The outdoor the fan failure		4. Replace the outdoor the fan
	J5(D5)	The outdoor unit address &capacity	1. The outdoor unit address dip switch setting incorrect		1. Reset address dip switch
		parameter setting incorrect	2. The outdoor unit capacity dip switch setting incorrect		2. Reset the capacity dip switch
			1. Supply voltage exceeds the limit		1. Install a voltage stabilizer
	31	Module protection (F0)	2. The outdoor fan stop or low speed		2. Improve or enhance the ventilation
			3. Module malfunction		3. Replace Module
	32	Module hardware protection	Module malfunction		Replace Module
	33	Module software protection	Module malfunction		Replace Module
			1. The connection of the driving module and DC inverter to the compressor		1. Reconnect correctly
		DC inverter the compressor	incorrect
	34				2. Replace the driving module
		unconnected	2. The driving module failure
					3. Replace the compressor
			3. DC inverter the compressor the fault
			1. The compressor overload		1. Eliminate overload causes
	35	DC inverter the compressor over-current	2. The compressor coil disconnect		2. Replace the compressor
		protection	3. Inverter the driving board failure		3. Replace the driving module
			4. The compressor failure		4. Replace the compressor
	36	The driving module overvoltage &	1. Supply voltage exceeds the limit		1. Install a voltage stabilizer
		undervoltage protection	2. The driving module failure		2. Replace the driving module
	37	The driving module radiator temperature	1. The driving module PCB failure		1. Replace the driving module PCB
		sensor the fault	2. Temperature sensor broken		2. Replace the temperature sensor
		Radiator high-temperature protection	1. The driving module failure		1. Replace the driving module
	38		2. The compressor failure		2. Replace the compressor
		(Frequency reduction)	3. The outdoor unit the fan stop or low speed		3. Improve or enhance the ventilation
			1. The driving module failure		1. Replace the driving module
	39	The driving module’s high-temperature	2. The compressor overload or the compressor is blocked		2. Improve or enhance the ventilation or replace
		shutdown protection			the compressor
			3. The outdoor unit the fan stop or low speed		3. Improve or enhance the ventilation
	3A	Module protection of DC the fan	1. The driving module failure		1. Replace the driving module
			33

 

AUX-CAC				MINI ARV
			2. DC the fan motor overload		2. Improve or enhance the ventilation
			3. DC the fan motor stuck		3. Replace the fan motor
	3C	Over-current protection of DC the fan	1. DC the fan motor overload		1. Improve or enhance the ventilation
			2. DC the fan motor short circuit or stuck		2. Replace the fan motor
	3H	Startup failure or out-of-step	The driving module failure		Replace the driving module
		operation of DC the fan module
	3J	DC overvoltage and undervoltage	The driving module failure		Replace the driving module
		protection of DC the fan	(The module output voltage is abnormal)

 

 

 

AUX AC Error Codes model 2021

No.	Failure Code	Failure Name	Primary Troubleshooting Parts
1	L0	DC Over/Under-voltage Failure	The outdoor unit controller / the power grid
2	L1	Overcurrent Protection on Phase Current	The outdoor unit controller / the power grid /
		of The compressor	the compressor/the compressor wire
3	L2	Step Failure of The compressor	The outdoor unit controller / the power grid /
			the compressor/system pressure
4	L3	Phase Failure of The compressor	The outdoor unit controller / the power grid /
			the compressor/the compressor wire
5	L4	Driver Module IPM Failure of The compressor	The outdoor unit controller / the power grid /
			the compressor
6	L5	PFC Overcurrent Hardware Protection	The outdoor unit controller / the power grid
7	L6	PFC Overcurrent Software Protection	The outdoor unit controller / the power grid
8	L7	AD Abnormal Protection in Current	The outdoor unit controller
		Detection
9	L8	Shunt Resistance Imbalance Failure	The outdoor unit controller
10	L9	IPM Temperature Sensor Failure	The outdoor unit controller
11	LA	The compressor Startup Failure	The outdoor unit controller / the power grid /
			the compressor/the compressor wire
12	LC	AD Abnormal Protection in PFC Current	The outdoor unit controller
		Detection

 

 

Display the error code of the indoor unit: fix speed A/C & E1.  E2, E3 and E4 Errors

No.	Error Code	Error Name	Probable Trouble Location
1	E1	Internal room temperature	Internal room temperature sensor, the main internal
		sensor error	control panel
2	E2	External coil sensor error	External coil sensor error, the main external control
			panel
3	E3	Internal coil sensor error	Internal coil sensor error, the main internal control
			panel
4	E4	The indoor the fan error	Mechanical jam of internal the fan blade, internal fan,
			the main internal control panel
5	E5(5E)	The indoor and the outdoor unit	Bridge cable, the main internal control panel, the main
		communication error	external control panel, module panel
6	F0	The outdoor DC the fan error	Mechanical jam of external the fan, external DC of the fan,
			the main external control panel
7	F1	Module protection error	The power voltage, the compressor cable, the reactor, the module
			the panel, the main external control panel, the compressor
8	F2	PFC protection error	The power voltage, reactor, module panel, the main
			external control panel
9	F3	The compressor out-of-step	System pressure, the compressor cable, module panel,
		error	the main external control panel, the compressor
10	F4	Exhaust air sensor error	Exhaust air sensor, the main external control panel
11	F5	The compressor cap sensor error	System pressure, the compressor cap sensor
			(Protection switch), the main external control panel
12	F6	External room temperature	External room temperature sensor, the main external
		sensor error	control panel
13	F7	OVP or UVP error	The power voltage, reactor, module panel, the main
			external control panel
		The main external control panel	Connection wire of module and the main control data,
14	F8	and module panel
			module panel, the main external control panel
		communication error
15	F9	The outdoor EE error	The main external control panel
16	FA	Recirculated sensor error	Recirculated sensor, the four-way valve, and the main external
			control panel

 

Aux Portable A/C Error Codes

No.	Error Name	Reference Code（	Reference Code
		AUX）	(ELECTROLUX)
1	Internal temperature sensor error	E1	AS
2	Internal coil sensor error	E3	ES
3	Lower DC motor error	E4	L3
	Communication Failure between
4	Display board and The main Control	E8	E4
	Panel
5	The water Full Alarm	P1	P1

 

Watch the video-

 

In conclusion, understanding Aux Air Conditioner error codes is essential for maintaining the optimal performance of your air conditioning unit. Regular maintenance and cleaning of your air conditioning unit can also prevent future errors and malfunctions.

I hope this guide has provided you with valuable insights into Aux AC error codes, and you can now enjoy a comfortable and cool summer season with your air conditioning unit functioning at its best.

 

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