Atwood furnace

[oldtrojan66]

I have a problem that doesn’t seem to be directly addressed here.

My furnace will ignite normally and run for 10 - 45 sec n shut off. The blower continues to run and flame will reignite after about 10sec. May run for 10sec, or 20: but shuts off again. Flame has not run for even a solid minute since this began. We are trying to keep from winterizing before we head south at the end of the month. Filled propane tank yesterday, but problem began before than. Have two tanks and switched to B when I thought A was nearly empty. Same issue on both tanks. Any ideas?
Thanks in advance, David

[oldtrojan66]

Yep, that took care of it. Not sure what goes wrong inside a switching valve/regulator, but the store where I bought the replacement said they put a new one on every pre-owned unit they sell.

So back to getting ready for trip South in two weeks. Hope to not need furnace much for a few months, but you never know. We have found, between our fireplace and an add-on Edenpure heater, we can avoid spending a lot on propane most of the time.

Thanks so much to everyone who commented!

Y’all be safe traveling, and help the other guy be safe along the way. God bless

David

[rav]

thats great you got it working.

[oldtrojan66]

As usual, I can count on my friends from rv.net to come up with the answers!

Ding, ding, ding, ding! We have a winner!

I thought I had tried both tanks, but apparently I did not sufficiently. I will replace the switching valve and regulator and report back to the forum.

Y’all have a safe and thoughtful Veteran’s Day

[Davidlee64]

I had a similar problem with mine. I had cleaned the heat exchanger out and everything else. It would light, just long enough to blow a tease of warm air. Then it would flame out, try 2 more times, then quit. It turned out there was a bit of crappola built up in the burner orifice. I cleaned it out with a welder's tip cleaner, and all is well and good again.

[John_Joey]

oldtrojan66 wrote:
... I can get to these parts from outside I think. Eraser is no problem...

Atwood you access from the outside, Suburban you need to pull the whole furnace out inside and work on them. I'm sure someone will point out the exception to that rule of thumb though. LOL

Chris a long time member of the forum has put together a very nice website to use when it comes to things like this. Might want to look at it if you're having a hard time falling asleep.

Chris's web Clicky

[newman_fulltime]

You have a bad propane regulator

[oldtrojan66]

rav wrote:
might also need to clean the exhaust

I will check this also, thanks!

[oldtrojan66]

Thanks, rig is plugged in at home to 30 amp. I can get to these parts from outside I think. Eraser is no problem. I will check later n report back. Have Veterans Day program at grandkids school!

[John_Joey]

Computer is not sensing a flame, so it cuts gas, but keeps the fan running to vent any fuel out.

Pull off the connection to the computer board and then put it back on. Same thing with the flame sensor. Hopefully all you have is a slight corrosion problem on the connections and this will solve the problem in the short term.

If it does fix it when you got better weather and time take a pencil eraser and very lightly shine up those connections.

If it doesn't fix the problem then you'll be looking at things like a new computer board, flame sensor, or wire to the sensor as possible problems.

One more thing make sure your rig is plugged in. If you have a weak battery the same symptoms will occur.

[oldtrojan66]

Yes, it ignites. And burns for 10-40 seconds, then goes off. Blower continues.

[rav]

will the stove light? might need to bleed off some air
you might also need to clean the exhaust- I had the same issue with mine and cleaning did it.
I would also checked all the connections