2017 3791RD - Atwood Furnace Issues

RicTrim

Member
Joined
Jun 27, 2019
Posts
27
Location
Granbury TX
The furnace on the "new to us" rig has stopped working. Am reaching out for some 'guidance'

- We picked up the rig the day before Christmas Eve - brought it to the campsite and plugged it in, and went about the Christmas weekend. The furnace was working at that time. After our return, we noticed that it was pretty "noisy" - motor squealing intermittently... Two days later, I found that the propane had run out, switched over the regulator to the other tank - and no furnace.... There is propane, as the stovetop and hot water heater continue to function ok.

So, I did the high level troubleshooting - turned thermostat off for a few minutes, and re-selecting the heat.. The furnace would begin to cycle - what I call "clearing the baffles", then shutting off before the burner would light. Tried this about 3 or 4 times - no change.

So, I popped the cover off outside. Easily located the sail switch - and replaced it. No change. Unit started and then stopped as before. As I was in there I noted the following...

- The circuit board is not attached to anything - it is simply held in place by the wires - is this normal?
- The 'fan' wheel at the bottom (where the sail switch goes) has fallen to the bottom of the shaft - and when sticking my fingers under it - can find no set screw or anything else to hold it in place if I lift it up the shaft. It's simply going to slip back down... I don't think this is how it is supposed to be...
- I have looked at a couple of troubleshooting guides and they reference a 'flashing light" that provides "codes" - where is this light?

My thought is that my next step is to remove the whole furnace for additional troubleshooting. Thinking that I have to get access to that lower fan and get it tightened on the shaft. In addition to whatever additional repairs need to be done. But before I remove the whole thing - are there other steps I need to exhaust first? I've repaired lots of things over the years, so this is not intimidating per se, just need better points of reference. And while lurking on this board for years - I know that there is someone out there who has done this dance previously.

The weather has not turned seriously cold here in mid-Tx (yet) - but I need to get this repaired before it does. We're making do with the fireplace and an electric heater in the mornings to remove the chill... We are full-timing - and have moved out of the 2006 rig and into this one...
 
Sorry for your furnace troubles. It can suck when it's cold out. Sadly, that's when most furnace issues show up.

Can you post a pic of what you're seeing with the fan? Given the symptoms you've stated I would have also suspected the sail switch. But if the fan is out of place or out of alignment then it likely isn't activating the sail switch as designed.

I've never seen or heard of the fan issue you're describing but there's a first for everything. If a pic can show what you're seeing then please post one.

As for the circuit board, they just sit loosely in place...they aren't screwed down. There might be a couple pins that help keep it loosely in place or maybe a simple cradle for it to sit in. But don't sweat it because it's loose.
 
I agree with JSB5717, probably need to pull the furnace and correct the fan problem first. If memory serves me correct this is a pretty simple system. t-stat calls for heat, board spins blower which pulls in sail switch, power goes back to the board to energize the gas relay and on to the gas solenoid along with ignition. then viola heat. Good luck- let us know what comes of your repair.
 

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