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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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heat from indoors is rejected outdoors in the heat mode the heat from outdoors is rejected indoors.
The system does this by evaporating and condensing refrigerant.
For the refrigerant to be "boiled" or "change state" from a liquid to a vapor a temperature differential must exist, meaning the heat from the outdoor air must "boil" the liquid refrigerant.
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For a refrigerant used for AC to be that cold the pressure will be in a vacuum for most refrigerants temperature pressure relationship.
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