Updated: A/C works, but not the heat pump
I've got a combination A/C / heat pump in my MH and I'm having an unusual problem with it. The A/C works fine (compressor works, fan works, blows cold) but at night when it's calling for heat, it sim...
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I would start by cleaning the contacts on the phone cable behind the Tstat if it's a single zone Tstat. Next I would clean them on the control board on the roof unit's control board. If this doesn't solve the problem.....
Hopefully it's just a bad reversing valve elect solinoid coil. The default on newer units is cooling... older units like mine is heat. You can remove the cover and check for 120V to the coil when on heating, there will not be any 120V to the coil on cooling. IF you do not have 120V to the coil when trying to heat... It's a bad control board.
Hopefully it's just a bad reversing valve elect solinoid coil. The default on newer units is cooling... older units like mine is heat. You can remove the cover and check for 120V to the coil when on heating, there will not be any 120V to the coil on cooling. IF you do not have 120V to the coil when trying to heat... It's a bad control board.
