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BengalBus's avatar
BengalBus
Explorer II
Dec 05, 2024

SF42 Furnace Running - will Heat for a few minutes then cold

Our furnace is running/blowing- will blow hot air for a few minutes then turns to cold air.  Propane is working - can light stove burners no issue.  Bypassed sail switch and same issue.  Anyone exper...
bid_time's avatar
bid_time
Nomad II
Dec 05, 2024

Clean the “proofer” rod. It’s a small thermocouple above the main burner. It tells the furnace “brain” that the main burner lit and all is well. Otherwise the “brain” thinks that raw, unlit gas is pouring into the camper and closes the gas valve.

BengalBus's avatar
BengalBus
Explorer II
Dec 06, 2024

He's tearing it all apart this morning- fingers crossed we can get to the bottom of it- luckily we aren't on a schedule just anxious to get out of the cold!  He's been reading the posts - he's a diesel mechanic so propane furnaces are all new to him!

 

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