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Heater blowing cool air

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PAdams

RVF Newbee
Joined
May 4, 2021
Messages
3
We have a 2017 Thor Hurricane with Coleman-Mach Heating and AC. While prepping for travel we noted the coach heater was blowing only cool air, not warm/heated while connected to shore power. Research online says maybe the Sail Switch but that seems ok. Thoughts?
 

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