This is a common complaint due to a "feature" of the Dometic thermostat. I seem to remember the manual actually documents this behavior but I don't recall the specific reference.
Anyway, these systems can have the fan running on the A/C if the system calls for heat and the fan setting on the thermostat is set to anything other than AUTO
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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