Question about Intertherm P3RA-036K Air Conditioner

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My indoor unit on my heat pump will not shut off. The electric heat keeps running, and the fan keeps running. It only happens when it is really cold, like 25deg or below, above that and it functions fine. The outdoor unit shuts off, but the indoor stays running. I do HVAC work, but I have never seen a problem like this. I have switched the stat out, and its just so strange. I figured the relay may be stuck, but if I turn the stat off, it turns off shortly after which tells me it may not be the contactor.

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  • Alan Conner
    Alan Conner Feb 01, 2010

    Plus, the emergency heat stays running. Thats the other thing I didn't mention. I know if that is running the fan has to run to prevent fire, but its not making sense why I can turn it off at the stat. I guess I will pull the interlock relay on the bank heaters that controls the fan and replace it for preventative measures and see if that fixes the problem.

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I would venture to say your stack relay is getting stuck. either that or you have a short in your low voltage wiring somewhere that is not always making contact....or it may be making contact through another median...like ice or frost. Remember electricity takes the path of least resistance.

But I would check the relay first. If its a stack relay or a closed type relay, try putting in a contactor that you can visually see if its closed or not.

Posted on Feb 01, 2010

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