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Intermittent heat I have a Carrier (Payne) unit (FA4ANF030) with intermittent heat output. The air works as does the fan when in heat mode, but usually no heat. Sometimes it will suddenly begin to put out heat normally and will function fine...until it doesn't. The thermostat was old, so I replaced it first. Seems to make no difference at all since it works exactly as before.

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  • Daniel Gooch
    Daniel Gooch Jan 19, 2008

    Sorry, it is electric heat only. I think that is just the air handler number. The heat unit listed is: KFAEH0401N10
    (I think this is the correct number to use.)

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Check wiring of heater, it may have loosed connection or corroded connection.

Posted on Jan 20, 2008

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It sounds like the unit has lost its first stage of Heat (It uses the outside unit to bring heat in with freon) When the thermostat is put 3deg higher than room temp it uses Heat Pump and heat strips, this is probably the only time yours heats. Have it checked as you will pay a lot on next month's electric bill.

Posted on Jan 19, 2008

  • joey  shearer
    joey shearer Jan 20, 2008

    Sounds like you have a relay issue with the heat strips then you will probably need a professional to diagnose and replace the faulty part unless you have a amprobe and volt-ohm meter, also a source to get a replacement part.

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