The repairman should have told you there are several things that can cause this. However.. the troubleshooting process is this for an in home tech:
Swap out PTC relay & the KliXon thermal overload (mated together on the compressor)
Check the run capacitor. Test compressor resistance while PTC and thermal overload are removed. Tech will read terminal R to terminal C and terminal S to terminal C (winding checks). Then the tech will read R, S and C to compressor case looking for a ground (none allowed)
After that comes the dynamic test..... it should run if the compressor is ok.
IF it does not run at this point the tech will start checking temp controls and do power readings to the compressor. That is pretty much the basic troubleshooting process.... However.... IF the compressor just attempts to start but never starts.. the tech will do a LOCKED ROTOR amperage check. If the rotor is LOCKED... your looking at a compressor change that can run $375.00 and up with the cost of the service call, labor, coolant and lubricant.
The repairman was correct in saying that the PTC relay is a common problem. He just did not tell you the whole story.
At least now you know what to expect.
Thanks for choosing FixYa,
Kelly
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