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Old 04-19-2022, 01:12 PM   #1
donaldN01
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Trouble with Furnace

I am having issues with my furnace. The blower starts, ignighter lights, runs for 5-10 minutes, then the flame stops, blower continues to run, then it reignights but only "flames" for 2 - 6 seconds and then the flame goes out. It does the ignition 3 times, flames for 2 - 5 seconds each time, and then the blower shuts off. If I leave it off for 30 minutes or so, when turned back on it repeats the same cycle of firing for 10 minutes then just blower stays running, reigniting 3 times for 2 - 5 seconds and then blower shuts off. If t's the sail switch it should not fire at all, correct.
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Old 04-19-2022, 03:44 PM   #2
sourdough
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Originally Posted by donaldN01 View Post
I am having a similar issue. The blower starts, ignighter lights, runs for 5-10 minutes, then the flame stops, blower continues to run, then it reignights but only "flames" for 2 - 6 seconds and then the flame goes out. It does the ignition 3 times, flames for 2 - 5 seconds each time, and then the blower shuts off. If I leave it off for 30 minutes or so, when turned back on it repeats the same cycle of firing for 10 minutes then just blower stays running, reigniting 3 times for 2 - 5 seconds and then blower shuts off. If t's the sail switch it should not fire at all, correct.

First, if you fill out your signature by going to the User CP and fill in your signature with the make, model and year of your trailer and tow vehicle it is much simpler to ask questions and get useful answers. Tagging on to this thread about a specific furnace may or may not offer anything for you if your furnace is a different model.

When I had a furnace that did what sounds like exactly what yours is doing it was the control board.
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Old 04-19-2022, 04:00 PM   #3
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Could it also be a resettable fuse? If the 12v fuse for the furnace is one of the black ones you might try replacing it with a plain old fuse of the same rating.
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Old 04-19-2022, 05:16 PM   #4
donaldN01
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I added my RV and TV to the signature. I do not have the model of furnace handy, but it is Dometic. I thought I would comment on this tread as it came up when I was searching for some answers. Was this OK or should I have started a new thread. Sorry Semi-Newbie here.
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Old 04-20-2022, 08:03 AM   #5
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Take the OEM resettable fuse for the Atwood Dometic and toss it and install a conventional ATC fuse. Most likely that’s your issue
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Old 04-20-2022, 10:19 AM   #6
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Take the OEM resettable fuse for the Atwood Dometic and toss it and install a conventional ATC fuse. Most likely that’s your issue
^^^ I agree, don't use it in the furnace circuit, swapping it out will probably keep your furnace working, but as "cheap as I am" I'd recommend not throwing it away. Sooner or later, you're going to be troubleshooting blown fuses somewhere in the trailer and that resettable fuse will come in handy to help locate the shorted wire without needing 2 or 3 boxes of regular fuses.... For me, the resettable fuse is great for troubleshooting, but I won't leave one in a circuit with any kind of heavy load....
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Old 04-21-2022, 03:48 AM   #7
donaldN01
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Where is the resettable fuse located? In the fuse box or in the Furnace somewhere. Also, would the blower still run and only fire for a short period if it is a fuse issue?
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Old 04-21-2022, 08:13 AM   #8
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Check in your fuse box and look at the one that's labelled for the furnace. Is it a black fuse? The resettable fuses can be glitchy and can trip after several minutes and later reset. Just replace it with a standard, plain old fuse (a blue one if it's 15amp).

If the fuse that's there isn't a black on then the issue is something else.
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Old 04-21-2022, 09:20 AM   #9
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Based on the issues you describe if the fuse doesnt fix the issue then I would be looking at the flame sensor... Its part of the Igniter.. If it cant detect a flame then the LP solenoid on the furnace will shut off

The furnace will then attempt 3 retries and if these fail the furnace goes into lockout mode..

To clear the lockout simply turn the furnace thermostat off and then back on and it will again run thru its light off attempts..

And NO.. the issue at hand does not sound like a sail switch
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Old 04-21-2022, 03:06 PM   #10
donaldN01
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I am not at the Trailer now, but I am almost positive all the fuses are just regular (blue 15amp) fuses. No resetting fuses.

Also, if it is the flame sensor, why would it function the first time, run for 10 -15 minutes, then shut the flame off, I assume because the high limit switch maxes out, Blower continues to run, then when it tries to ignite (after it cools enough), that's when the 2 - 5 second flames happen, and then shuts off after 3 attempts.

After a lot of online research and video watching, I think it's a control board issue.
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Old 04-22-2022, 06:40 AM   #11
thatoneguy
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Had a very similar issue, had one wire that somehow shorted on the control board and burned up but not all the way. Re-spliced a good wire in its place and no issues.
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