Have a new Coachmen Leprechaun-checking everything, getting ready to head to Florida-found that the furnace refuses to light. Plenty of propane in the tank, batteries charged, electric plugged in, gas at stove, refer runs on gas, HWH ignites(it is beside the furnace). The fan comes on and I can hear the igniters clicking, but no fire. Bought the MH this spring and don't believe I have run the furnace since purchased. Can't get in at the dealer until 1-3-19. Any ideas?? Still under warranty, but the dealer is about 100 miles away, and it's getting too cold for me to hang around in Ohio much longer. Gary

I'll take a quick wild shot at it....not getting gas???All of our furnaces had a gas shut off valve. Look on the back side of your furnace...access from the outside and find the gas line. Make sure the valve is turned on.Good luck with it. Post back.

Does it make any sounds? It could be dirty sail switch. Blow out the sail switch with compered air.

AFAIK, the clicking indicates it thinks there is gas to the burner, but not lighting means gas is not getting out of the orifice or something wrong with the gas shape or volume coming out, so the sparks won't light it.IMO you have to get at the "burner" where the igniter sparkers are and see if there is an obstruction or whatever.

Check the multi-wire connector on the circuit board.Do you smell any propane?Get an electric heater!Sail switch should be OK as power is getting to circuit board.

downtheroad wrote:I'll take a quick wild shot at it....not getting gas???All of our furnaces had a gas shut off valve. Look on the back side of your furnace...access from the outside and find the gas line. Make sure the valve is turned on.Good luck with it. Post back.I wondered about that. tomorrow weather permitting I'll take a look. enblethen, I don't know what a "sail switch" is. Been around RVs for years but gas things I have never messed with. Gary

furnace refuses to light | Good Sam Community

gkainz
Explorer
Dec 27, 2018
my bet is a spider clogged the gas nozzle. Remove and clean with alcohol. Do NOT poke a wire or anything through it. Test for gas by turning on furnace and apply a bbq lighter to the nozzle end while ignitor is sparking/clicking.
midnightsadie
Explorer II
Dec 24, 2018
I,m in the canton area ,louisville, your not far .and if the tech won,t come offer a bonus.
routeforty
Explorer
Dec 24, 2018
midnightsadie wrote:
forget about the dealer, call a local rv tech .some do warrenty work. they come to you.
I thought of that, but couldn't find one local. The closest I could find was one in the Canton, Oh area. We're in amish country around Holmes county about an hour away. If there was someone local it probably would be cheaper to pay him than to drive to the dealer.
midnightsadie
Explorer II
Dec 24, 2018
forget about the dealer, call a local rv tech .some do warrenty work. they come to you.
Dusty_R
Explorer
Dec 24, 2018
It could also be that the spark is not in the right place. A short some where in the wire before it gets to where it needs to be. Or the spark igniter needs adjusting.
routeforty
Explorer
Dec 24, 2018
If it's not too cold tomorrow I'll take a look at it. That would be awesome if there's just a valve inline that hasn't been opened yet.
BFL13
Explorer II
Dec 24, 2018
routeforty wrote:
BFL13 wrote:
There is a sequence to ignition. The blower gets the sail switch to close, which energizes the board, which lets the furnace purge for about 20 seconds, then the board opens the gas valve and the igniter sparks when the gas valve opens.

You are getting the sparker clicking, so there is gas to that point. Your problem must be with the gas after it gets past the gas valve, as I mentioned before. At least that is what it seems from here.
So possibly I'm getting gas to the igniter but it's not lighting? Would the igniters spark if there was no gas going to it?

I don't know exactly if the ignitor only works if the gas valve opens first (I thought so, but the wording on that is not clear), but they both work together.

You could have gas coming past the gas valve so the igniter sparks, but the gas might not be getting to the igniter because of an obstruction in the "burner" perhaps. (wasp nest? plugged up orifice?)
enblethen
Nomad
Dec 24, 2018
Yes, the ignitor would spark with no gas.
If no power is getting to the gas valve from the circuit board there will be no fire. The power comes off the circuit board to the gas valve. You could test while the ignitor is clicking for power to the gas valve.
routeforty
Explorer
Dec 24, 2018
BFL13 wrote:
There is a sequence to ignition. The blower gets the sail switch to close, which energizes the board, which lets the furnace purge for about 20 seconds, then the board opens the gas valve and the igniter sparks when the gas valve opens.

You are getting the sparker clicking, so there is gas to that point. Your problem must be with the gas after it gets past the gas valve, as I mentioned before. At least that is what it seems from here.
So possibly I'm getting gas to the igniter but it's not lighting? Would the igniters spark if there was no gas going to it?
BFL13
Explorer II
Dec 24, 2018
There is a sequence to ignition. The blower gets the sail switch to close, which energizes the board, which lets the furnace purge for about 20 seconds, then the board opens the gas valve and the igniter sparks when the gas valve opens.

You are getting the sparker clicking, so there is gas to that point. Your problem must be with the gas after it gets past the gas valve, as I mentioned before. At least that is what it seems from here.

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