SF 42 furnace madness
So, turned on heat and got fan but no ignition. Pulled furnace and cleaned, while also doing a tune-up. New sail switch, new overtemp switch, new ignitor and new burner installed. Bench tested 12v + a...
Forum Discussion
Lt46 wrote:
Thanks Doug. The furnace harness has the red, yellow, and 2 blue wires which terminate into a molded plug that connects to Winnebago's house wiring. The 2 blue wires I followed from there and they terminate into the mini on/off switch near the circuit board. I see no other blue wires. BTW, I never altered any Winnie wires nor the furnace wires. Molded connectors at each ends of the Winnie wires.
Is it possible you swapped the blue wires inside the furnace when you did all the work? The MAIN thing, you should have 12 volts positive on 1 of the blue wires exiting the furnace. Report back on this. Yes, most RVP and Dometic systems have a relay, but you state the wall tstat is dead. Which means you have no power to the tstat or upper control board. Doug
