Originally Posted by Kreilly
I have a Dutchman Denali 2017 5th wheel.
The furnace blower is coming on. Sounds like lighting for 15 seconds and shuts off. 30 seconds later tries again. I did replace sail and limit switch and now one flash does not happen on red light.
So I appeared to fix limit switch issue.
But furnace does not stay lit and heat up rv.
I'm at a loss. Vents are clear and no bugs or webs I can see in exhaust.
Any thoughts 😕
The lightning sound is the spark igniter. It will try to light three times, then shut down.
The igniter does not start until the sail switch is made, so the sail switch is not the problem. Cleaning the burner tube is a good idea, but if sail switch is made, a plugged tube is unlikely.
If the burner does not light while igniter is sparking, there is no gas flow. Check voltage on gas valve.
If it lights briefly and then goes out, the cause may be the spark igniter. The spark igniter also doubles for heat sensing. If no heat reported, it will stop sparking and wait with blower "on" to clear the chamber. Then it will open gas valve and spark for a while again.