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Intertherm S3QA042K compressor won't restart

I have an Intertherm S3QA042K that has an intermittent problem. Once the compressor runs and cools house to set temp and cycles off the compressor won't restart when the thermostat calls for cooling again. I've checked the run cap and it checks fine, replaced contactor, thermostat, and wiring from outside unit to inside unit. I can switch off the breaker to the compressor wait for an hour or so and then switch it back on and it starts and cools again to set temp. Problem returns after next cycle or so where the compressor won't restart. The contactor clicks and I'm getting 24VAC . Shut off breaker, wait, and reset breaker and it runs again

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Sounds like rotor lock. (intertherm sold a hard start kit under the name "soft start" kit for high temperature areas) If you hear your bus bar humming in the electrical panel when it attempts to start this is a good indication.

Posted on Jan 26, 2011

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You probably need a hard-start kit. A hard-start kit connects to the run capacitor and provides a starting boost for your compressor. If you install a hard-start kit, monitor your a/c for a while because it is possible that the bearings in the compressor are going bad.

Posted on Jul 30, 2009

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