Heater not engaging

[VetPartTimer]

Originally Posted by curryd

Yup. Water was getting to the circuit board and fried mine. It’s a $90 DIY replacement. Then I had to stop the water infiltration!

Ditto on the circuit board due to water intrusion/pooling in the circuit board tray. I had exact same symptoms and the back of my board had some suspicious looking spots.

[MJC62]

Our fridge does the same thing after it is not used on gas for awhile. Goes through the cycle a couple times and doesn't light. I solve the problem by manually lighting the burner. After the initial manual light the fridge will start on its own the next time. I suspect some dirt may be playing a part. I need to clean the fridge burner and check the "lighter fork" adjustment. As the season is short will add to the winterize list.

[2015axis]

It sounds like the sail switch.. search testing RV Furnace sail switch.. it's pretty easy to jumper.

[RCCraig]

I agree it sounds like a “sail switch.” My coach had similar symptoms, I stopped at a nearby RV place, and the technician had it diagnosed, part replaced, and on my way in about one hour. Seems like it was total cost of $100 or so.