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Heat pump turns on and off in the heat mode

My heat pump works fine in the A/C mode but in the heat mode it cycles on and off every 20 seconds what could be the possible problems. The filters are clean and it works fine in the A/C mode

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  • gntschorn Jan 17, 2009

    Are the coils you are speaking of on the outside unit, which are clean, or in the inside unit ?

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Check both coils. If they are dirty have them cleaned.

Posted on Jan 17, 2009

  • Perry Putnam
    Perry Putnam Jan 17, 2009

    Coils are inside and outside. Is it just the outdoor unit that short cycles or inside too? If it's just the outside it can be cycling off on low pressure but may not be because of low refrigerant charge. There may also be a restriction at the metering device which regulates the flow of refrigerant. Unfortunately you will only be able to check the coils. If they are clean you will need a Serv. Tech. to complete the diagnoses.

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