Forum Discussion

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...
howardwheeler's avatar
howardwheeler
Explorer
Jan 15, 2019
That is what I feared. So I also have an erratic control board. Moving the ambient sensor definitely made a big difference. Before I couldn’t get it to go into defrost until it was in the low 30s. Now it starts in the low forties but I have definitely had two short cycles of the defrost segment. So I need another control box. Thanks Doug

About Technical Issues

Having RV issues? Connect with others who have been in your shoes.24,283 PostsLatest Activity: Jul 17, 2025