Question about Carrier 38CKC042 Air Conditioner

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Squeeling noise coming from AC, compressor is on, fan not turning

I also noticed a loud squeeling sound coming from the AC unit when the AC was running yesterday. Not sure when it started but had turned it on about 1 hour before i heard the noise. Never heard that noise before. I also turned the AC off because it sound like something was wrong. Now, when I turn the AC on I can hear what sounds like the compressor running but fan is not spinning and then the squeeling sound starts. While off, i can spin the fan. If it's a capacitor problem where is it located and is it and easy inexpensive fix. I also reset the circuit breakers and they didn't fix the problem. Any other help would be appreciated. Thanks

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I would first make sure there is correct voltage reaching the start capacitor and fan motor before automatically replacing those two parts.

Posted on Jul 06, 2008

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The squealing noise is coming from the compressor. This noise is common when the unit reaches extreamly high pressures. The pressure is most likely high because the fan is not running. Since you can spin the motor it could be that the motor has damaged windings. Leave the unit off until the repairs are made to ensure no further damage to the compressor. You will need a multi meter and some experience reading wiring diagrams to properly diagnose the system. You can perform an amp draw on the motor to see if it is in spec. You can measure the volts to the motor and see if they are in spec. Finally the contactor can be measured with the proper meter to see if it is working properly.

My suggestion is to have the Motor and capacitor both replaced. Also inspect the wiring in the condenser electrical compartment for any signs of damage or burning.

Posted on Jun 25, 2008

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