Durning the summer I had my Dometic A/C swapped out for an Atwood Air Command Heat Pump. It worked great on Air Conditioning but would not work on heat pump. It would not let me even turn on the gas...
The thermostat probably needs to be programmed...will have to go into the Menu to check if the original thermostat is capable of operating a Heat Pump...if not will have to change it out.
Whenever you have a can of worms....GO FISHING.
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