Wild guess, something not right with the electronic climate control. Not likely that both AC units and both heaters failed at the same time. Temporary fix maybe to disconnect the "heat demand" wire from the controller if you can identify which one it is. If coach has been sitting idle, rodents may be at play on the control wiring.
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1998 Min Winnie, 2000 Winbago Journey, 2015 ACE 29.3
2016 Thor Miramar 34.2
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