i am confused about your rig having both a heat pump and a furnace. I have installed heat pumps in homes and they work fine. Not sure why they would have both in a RV. As for your problem you can call a service tech from a heating and air company to come out and look at it. They are all the same. A heat pump is a interesting unit. it acts like a AC in the summer than reverses itself and acts like a heater in the winter. It reverses the Freon in the unit and uses the heat from the Freon to heat the RV. There isn't no gas hooked up to a heat pump they are all electric. It has a closed system like a residential refrigerator with a compressor and motor inside. Your thermostat may be bad or the circuit board in the unit may be bad. Very hard to say. Something isn't telling something to come on.
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