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Heat pump cycling on and off.

Exterior heat pump, Carrier Mdl 38YCC036340, cycles on and off when thermostat set on heat and fan on auto with ambient interior temp at 65 deg and thermostat set at 72 deg. Emergency heat function working properly. In Emer Heat function, heats house to desired temp and keeps it there. I have turned the heat pump off and am relying entirely on the emergency heat function to heat the house. What can I do to test the heat pump and or the thermostat? Thanks

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  • mikie1999cr Mar 11, 2009

    mastatech,



    Any way to check the r22 level on the system, before, calling out the A/C guys? Just to make sure 'that' is the problem?



    Mike

  • victor mosley May 20, 2013

    breaker popping

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  • Contributor
  • 478 Answers

It sounds as if you you have a low charge of refrigerant, r22. When the unit comes on outside, the outdoor coils become the lowside, there is a low pressure switch that is tripping out contactor protecting the compressor.

Posted on Mar 11, 2009

  • mark milligan
    mark milligan Mar 12, 2009

    Without gauges doubtfull, but in a fix a tire gage can give an indication, but you would have to short the lowpressure switch.

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Now there may be other exceptions but Ive tried to give you a heads up on some of the most common ones.
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If this helpd you understand your problem would you please give me as hifgh a mark as you can. Thnaks for using fixya and good luck.

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