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howardwheeler's avatar
howardwheeler
Explorer
Jan 15, 2019

Domestic heat pump and defrost cycle below 42 degrees

I had a Duo Therm heat pump that wasn’t going into defrost in temps below 42 and above 30. I repositioned the ambient sensor to one of the vent holes to the outside air and it started working. The fac...
sayoung's avatar
sayoung
Explorer
Jan 15, 2019
dougrainer wrote:
The Main Control board is what determines the length of Defrost. Once the Sensor indicates it needs the defrost cycle, the control board then starts the sequence and stops it. Doug

The control board should also have a max defrost time limit . I have never serviced a rv heat pump but on residential/commercial units the defrost sensor should be mounted on the outside coil ( condenser ) as it gets cold in heating mode, 15 to 20 degrees below ambient temperature.

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