The fan runs but the compressor will not come on. The thermostat looks corroded. How do I check it?
ANSWER Hello Jim,
If the thermostat were the issue, the fans wouldn't run. This is most likely the start device 216649303 on the side of the compressor. If you remove it from the compressor and shake it, if it rattles, the internal ceramic disk has shattered and the start device will require replacement.
To test the thermostat, unplug the unit and flip the thermostat to the off position. Using a test meter set to the resistance X1 scale, test from one wire to the other. It should read no contact. Turn the switch to the full blast position. Now the thermostat should read no resistance, (almost the same as touching the meter leads together).
Answered by AppliancePartsPros.com | Friday, July 20, 2012