When an AC is not blowing cold air, there could be several reasons behind it. One common cause is low refrigerant levels, which can happen due to a leak or natural wear and tear. Without enough refrigerant, the AC struggles to cool the air efficiently.
Another issue could be a dirty air filter, which restricts airflow, causing the system to overheat and fail to cool properly. Additionally, a malfunctioning compressor or a faulty thermostat could prevent the AC from reaching the desired temperature.
It’s also important to check for blocked vents, as restricted airflow can affect cooling performance. Regular maintenance and timely repairs can help keep the AC running smoothly.
Why AC not Blowing Cold Air?
There are many reasons why your air conditioner stops throwing cold air. Here we are sharing with you 10 most common causes that can be the reason for not cooling your room. Below are common problems and solutions explained clearly.
1. Clogged or Dirty Air Filter
One of the most common reasons for poor cooling is a dirty air filter. When dust and debris block the filter, airflow is restricted, making it harder for the AC to cool your home. Clean or replace the air filter every 1-3 months.
2. Thermostat Settings
Your thermostat might be set incorrectly or have dead batteries. Ensure it’s switched to “Cool” mode and the temperature is set lower than the current room temperature. Replace old batteries if the screen is blank, and reset it by turning it off for a few minutes.
3. Ductwork Issues
Blocked or leaky air ducts can prevent cold air from reaching different rooms. If your AC is running but certain areas of your home aren’t cooling, there may be a problem with the ducts.
4. Power Supply Issues
Check your home’s electrical panel for a tripped circuit breaker connected to the AC. Flip it back on if needed. Also, inspect the outdoor disconnect switch (a small box near the unit) to ensure it’s turned on. Blown fuses in this box can stop power flow—replace them if broken.
5. Faulty Capacitor
The capacitor provides energy to start the AC motor. If it fails, the unit may hum but not turn on. Capacitors are dangerous to handle due to stored electricity—always call a professional to test or replace this part.
6. Dirty Condenser Coils
Dirt, leaves, or grass blocking the outdoor unit’s coils can cause overheating. Turn off the power, gently rinse the coils with a hose, and trim plants at least two feet away for proper airflow.
7. Low Refrigerant Levels
Refrigerant leaks prevent the AC from cooling and may cause ice buildup. Hissing sounds or ice on pipes are warning signs. Only licensed technicians can safely fix leaks and recharge the system.
8-9. Broken Contactor or Fan Motor
The contactor sends power to the motor, and the fan releases heat. If either fails, the unit won’t start. Look for burnt marks on the contactor or listen for grinding noises from the fan. Both require professional repair.
10. Faulty Compressor
The compressor is responsible for circulating refrigerant through the system. If it’s not working properly, the AC won’t be able to cool effectively. This is usually a more serious issue that requires professional attention.
When to Call a Professional
If you smell burning, notice refrigerant leaks, or the breaker keeps tripping, shut off the AC and contact an HVAC technician. Electrical or coolant issues are not safe for DIY fixes.
Final Tips
Regular maintenance prevents most problems. Clean the outdoor unit seasonally, replace air filters monthly, and schedule annual professional checkups. Simple fixes often save time and money.
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Thank you so much dear Sonam ma’am! We are glad to say that we are very happy with your feedback. thanks for visit! keep sharing! 🙂
hi guys :). I am looking for help for me and my girl. i am from France
While checking on my brother’s vacation house the other day, I had noticed that there was a large amount of liquid springing from one of the AC units at the back of the house. I had initially thought that this was just condensed water, but I never knew that refrigerant can also leak from a unit and cause warm air to circulate instead of cold air. I may need to consult with my brother about this so we can look for an AC contractor to help us out, but I’ll keep the rest of your tips in mind in case we need to get our ACs checked again. Thank you!
Most Welcome
It’s about four days now since my air conditioning system at home hasn’t been emitting cold air and been producing noise when I’m using it. I had no idea that when I hear any hissing noise coming from the ac unit, this means that there may be a leakage within the refrigerant. With that being said, I shall then find a repair contractor to see the damage and fix it.
Thank you very much for the invitation :). Best wishes.
PS: How are you? I am from France 🙂
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