why is my central air unit not cooling?
193696
If your air conditioner will turn on, and your thermostat is set properly, but your system is not cooling you may have a dirty or blocked air condenser. ... If your air conditioner is still not cooling air, you may have a problem with your compressor or refrigerant and will need to contact a professional.
1208444
Loss of the Freon. Is a major cause for air conditioning pipes to freeze within. The level of Freon or air conditioning refrigerant goes low resulting in frozen pipes. When this happens, the whole ac unit finds it difficult to manage which eventually leads to improper cooling at home.
457111
Problem #3: Faulty fan motor BUT, if your fan isn't running, or it's running too slow, it will cause low airflow. Like we mentioned before when we discussed dirty air filters, low airflow causes limited air circulation and a frozen evaporator coil—both of which mean you're not feeling cold air coming from your AC.
472677
['Turn the air conditioning system off.', 'Check your filter and change or clean the filter (depending on type) if it is dirty or clogged.', 'Allow all of the ice to melt completely. ... ', 'With a fresh filter installed, turn your system on again to see if the problem is resolved.']
191983
Fan and Fan Motor If your window air conditioner is not blowing any air, the problem could be the fan or fan motor. ... If the circulating fan is not running or running too slow, little or no air flow over the evaporator coils will allow them to become too cold and frost or ice can form, restricting the air flow even more.
101903
The AC unit won't turn on Usually when the outdoor unit doesn't turn on, it is because the circuit breaker has been tripped. ... If you find that the AC unit still does not work, the next probable cause is the thermostat. A non-responsive thermostat will fail to communicate with the rest of the central air system.
1004988
Could be one of several issues. Dirty or failing thermostat or loose connections are most likely candidates. Another option could be fan relay or control board. A more remote possibility could be a weak run capacitor.
639754
The most common cause of window air conditioners icing up is a lack of adequate air flow. ... If the circulating fan is not running or running too slow, little or no air flow over the evaporator coils will cause them to become too cold and frost or ice can form, restricting air flow even more.
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AC Fan Not Working Inside If your AC indoor fan isn't working, first check to make sure a breaker hasn't been tripped. If all is OK, check your air filter. ... If there's ice on the evaporator coil and refrigerant lines, allow the ice to melt, then check again to see if the fan is working.
80379
Problem: Either no power is getting to the outdoor unit or you have a defective compressor contactor. The contractor's job is to send power to the compressor and fan motor. There could be other issues, but these are the common ones. Solution: Check the circuit breaker box.
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Lack of Airflow Weak airflow is one of the first signs that an air conditioner is on the fritz. You'll start to notice little airflow coming from the AC vents, which is a sure sign that the unit's compressor is failing or that your ductwork is clogged.
421117
The cooling fan in the condenser is the first thing that you should look into while finding out the reason for car air conditioner not blowing cold air when idling. If the fan is damaged or cannot run with its full force, it cannot cool down the heat coming from the Freon (refrigerant) through the condenser.
551301
This is due to discrepancies between the unit's power and the actual need for cooling, which is typically determined by the size of the space. Too small, and the AC won't work properly—too large, and it will cost you excessive amounts of money to run, while also significantly shortening its lifespan.
73799
If your air conditioner will turn on, and your thermostat is set properly, but your system is not cooling you may have a dirty or blocked air condenser. Your first step is to check the outside unit and clean around and remove any debris or weeds that are blocking air circulation.
744207
The most common cause of window air conditioners not blowing cold air is a lack of adequate air flow. In a properly working air conditioner, a fan will draw air over the evaporator coils, where it is cooled, and then be re-circulated back into the room.
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Problem #1: Low airflow over the evaporator coil. An evaporator coil in a central AC unit. ... But if there is a lack of warm air blowing across the evaporator coil, then the refrigerant gets too cold, which can cause the refrigerant line that connects to your outdoor unit to freeze.
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Debris Surrounding the A/C Unit When an air conditioner doesn't have sufficient airflow because of dirty evaporator or condenser coils or because of vegetation surrounding it, it won't cool your house well. Keep vegetation at least 2 feet away from all sides of the unit.