On our 2011 Sunseeker 3100, the heat pump will go into defrost mode when the outside temperature drops below 40 F. It runs in defrost for a certain number of minutes, putting out no heat, then runs putting out heat for a certain number of minutes. The outside temperature sensor is mounted on the unit. Below 30 F our Dometic thermostat stops the heat pump and runs the furnace, even if the thermostat is set for heat pump. Your thermostat may work differently.
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RamblerGuy
2011 Sunseeker 3100
2016 Ford Edge Toad
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