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Heat pump cycling on and off.

\015 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\015

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.

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