I'm at my wits end over this furnace. Yes, it's under warrenty. Yes, we full-time. Yes, I called a mobile tech (who didn't show up), No, I can't drive to a major city for work until the first of April. That said.We have a 2015 North Trail 26LRSS. The furnance for lack of better term is forgetting to turn on. We installed a new thermostat and that didn't help. If you turn the unit from off to on it starts right up and gets to temp with no problem. Then once it clicks off it's a **** shoot whether it will automatically turn back on. You'll hear the thermostat click but he blower doesn't come on nor does it try to light. Sometimes it does come on. Usually it doesn't. I've checked all the vents, the exhaust, new thermostat. Nothing has helped. Propane tank is full and has even been swapped from side to side. Regulators seem to be in good shape. I'm totally over it.I don't really have the time to hook up and take it to Jacksonville before we head to Nashville at the end of the month. Any ideas for what else to look at?

2oldman wrote:Batteries ok?We're plugged into shore power. Should it matter? They're less than a year old.

All that stuff takes 12v to run.. doesn't sound like your problem.

Would depend on make and model. No fan would indicate that the fan relay is not operating. Identify what furnace.It could be a bad circuit board or connection to the circuit board

enblethen wrote:Would depend on make and model. No fan would indicate that the fan relay is not operating. Identify what furnace.It could be a bad circuit board or connection to the circuit boardIt's an Atwood. The manuel is models AFMD 16, 20, 25, 30, 35. All of that stuff is out of my league. As a mid-30s piano teacher I know my limits.

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WeBeFulltimers
Explorer
Mar 07, 2016
enblethen wrote:
You could open the outside access. Locate the incoming wires from the thermostat and the power source. Make sure the screws that hold the wires are tight.
Wiggle the interior wires to see if one pops loose.
Try contacting Atwood for another service person!

Mine was doing the same thing about 5 years ago and I did this. Found a bad wire connection. Mine was also an Atwood. When it tries to start and doesn't, wiggle the wires.
mlts22
Explorer
Mar 06, 2016
Had a very similar issue the second year I had my TT. Cause -- a dead furnace board.
Happy_Prospecto
Explorer
Mar 06, 2016
My suburban furnace was acting the same as the OP's and I ended up replacing the circuit board.

The information is out there, all you have to do is let it in.
rhagfo
Explorer III
Mar 06, 2016
Check the T-stat connections at the T-stat and the furnace, if all good, most likely bad board. It is like it doesn't see the start signal.
Gene_Ginny
Explorer
Mar 06, 2016
MTHome wrote:
... We installed a new thermostat and that didn't help. If you turn the unit from off to on it starts right up and gets to temp with no problem. Then once it clicks off it's a **** shoot whether it will automatically turn back on. You'll hear the thermostat click but he blower doesn't come on nor does it try to light. ...
If you turn the thermostat off then on again at that point does the furnace start?

Since the blower starting is the first thing that has to happen it can't be an LP problem.
Bird_Freak
Explorer II
Mar 06, 2016
enblethen wrote:
Sounds like a defective circuit board.
I agree. Other post you have had suggest purge propane tanks, sail switch,and power supply. it can't be any of these since your op stated you could turn it off and back on and it would start back up.
enblethen
Nomad
Mar 05, 2016
Sounds like a defective circuit board.
MTHome
Explorer
Mar 05, 2016
All the lp appliances work and I've run the double burner proane grill off both tanks with no problem.
enblethen
Nomad
Mar 05, 2016
Does the other LP appliances work? Light all the burners on stove and water heater.
This should tell if the LP tanks or regulator is an issue.
Dog_Trainer
Explorer
Mar 05, 2016
I had the same problem last year. Finally last fall I took the furnace out to get to the igniter. The problem was that the distance from the electronic igniter to the top of the furnace was off. I had to adjust it to the proper gap. Since then it has worked every time. I am in Florida for the winter so the furnace is in constant use. Go outside by the furnace vent and as the thermostat clicks you should hear the click of the ignitor if it clicks and then nothing happens it could be the gap.

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