your window air conditioner troubleshooting by ensuring that the routine
maintenance has been performed on the unit.
Then, your window air conditioner
troubleshooting should start with checking the different modes of
operation to see which components operate. Turn the unit fan to on and
the cool and heat modes off. If the fan does not operate, check the
power supply to the unit. Check to see if
the breaker or fuse for the unit is tripped. If the breaker/fuse is
tripped, check to make sure that it is the proper size circuit for the
unit you have. On some units, there is a current interrupter on the
power cord to the unit. Check to see if it is tripped by pushing the
If the circuit is the proper size, then you can go
ahead and reset the breaker/fuse. If it trips again, then you require
further troubleshooting. Shut the power off and check all of the wiring
in the unit to make sure that none of the connections is loose or
If the fan does not operate but the fuse/breaker is
not tripped, you should check the run capacitors for the fan and
compressor. If the capacitors are good but the fan motor does not
operate, you can check the fan switch and the fan motor. Ensure that the
fan blades spin freely.
If the fan motor operates but the compressor does not
start, you should feel the compressor with your hand. If it is very hot,
then you should allow it to cool. Then, you can take resistance
measurements to make sure the compressor motor is good.
Then, you should attempt to start the unit in the
cooling mode. As you do so, listen for a clicking sound which is an
indication that it is attempting to start. If the compressor starts but
does not cool properly, the unit may be low on refrigerant.
If the compressor attempts to
start but shuts off very quickly, the compressor could be bad.
Generally, if the compressor is bad on a window air conditioner,
it is cheaper to replace the entire unit than to fix it.
You can check out our brand ratings to help you to
choose the right brand to replace your broken unit.
If the compressor does not
attempt to start, ensure that the thermostat is set below room
temperature. On units with a mechanical control, you will hear a click
when you adjust the temperature. That is an indication that the
thermostat is working properly. On units with an electronic control, you
can take a resistance reading of the temperature sensor to verify it is
good. If the sensor is good and the compressor checks ok, then the
control board is probably bad.
You should complete your window
air conditioner troubleshooting by observing the unit's operation
through a complete cooling cycle. During this time you should check the
difference between the temperature of the air entering the unit and the
temperature of the air leaving the unit. There should typically be a ten
to fifteen degree difference.
Buying A Window Air