What are common things that go wrong with air conditioners?
If your air conditioner isn’t working, first check the circuit breaker or fuse that serves the unit. Change the fuse or reset the circuit breaker if necessary. If the compressor turns off and won’t come back on during a very hot day, the unit may have built up a high head pressure and the high-pressure limit switch may have tripped. This switch is usually located right inside the access panel on the compressor unit. Simply push the button to return it to operation. If the air conditioner doesn’t cool or isn’t cooling effectively, check the thermostat to make sure it is set to “cool” rather than “heat.” Dirty evaporator or coils or a dirty filter in the air handler or furnace also can keep air conditioners from cooling effectively. Also, if you operate the air conditioner when the air temperature is below 60F, you might find frost on the evaporator coils. If you do, it’s time to turn off your air conditioner.
