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Old 12-18-2018, 02:21 PM   #1
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Furnace

We have a 2006 19 foot Bambi. During trip this summer, furnace would not ignite. It was like it was getting no gas. Ok, bought electric heater for trip. Got home to get repaired, but it flamed on each time I tried. So, went desert camping. It didn't work. Stayed warm with electricity again. Got home, tried, flamed on right away. Any ideas? Stuck gas valve? Click image for larger version

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Old 12-18-2018, 05:07 PM   #2
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There is a thing called a "sail switch" in the furnace. It detects that the blower is putting out enough air flow to light the burner. When that switch closes, the gas valve and ignition sequence start, then the burner lights.

If, as I suspect, you were at a higher altitude than normal, the switch may be just marginal or slightly miss-positioned in the air flow path from the blower. Take a look at it and see if it is moving freely and see if that is the issue...

Another possibility is that the ignition electrode is not properly positioned and has trouble sparking at altitude. That will be tougher to troubleshoot
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Old 12-18-2018, 05:31 PM   #3
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Ist time sea level, 2nd time in borrego springs. Don't think altitude an issue. At home, also sea level, I hear igniter, usually flame on right away. On trips I hear igniter, doesn't ignite
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Old 12-18-2018, 05:34 PM   #4
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OK, if it's sparking, that means the sail switch is probably working, so see if you can tell gas is flowing every time. This is a tough one...

Poke around the forums for more threads on the subject.
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Old 12-18-2018, 05:44 PM   #5
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Furnace

Do your other gas appliances work?

Sorry to get that basic, but sometimes the simple things can trip us up.
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Old 12-18-2018, 05:44 PM   #6
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Yes
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Old 12-18-2018, 05:46 PM   #7
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Hot water heater sounds like a Harley...heats great
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Old 12-18-2018, 05:49 PM   #8
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Furnace

Short of a loose wire in the unit somewhere Iím going to SUPPOSE that youíre looking at a computer board issue thatís intermittent....

If I were you I would buy a Dinosaur board and see if that fixes your issue.

If not, you now have a spare board....(that really is what Iíd likely do)
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Old 12-18-2018, 05:51 PM   #9
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Board checks out ok. Had a new one hooked up, did same thing.
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Old 12-18-2018, 06:12 PM   #10
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Quote:
Originally Posted by Garymaya View Post
Board checks out ok. Had a new one hooked up, did same thing.


Tough problem.

You might try bypassing the sail switch as a TEST, see if it makes a difference in how it fires.

If that doesnít make a difference, and there are no lose wires, than Iíd be looking at the propane control valve.
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Old 12-18-2018, 06:16 PM   #11
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Thank you all for your help
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Old 12-18-2018, 06:29 PM   #12
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But then again, it might be the thermocouple bypass circuit used for starting the flame until combustion temperature is reached.
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Old 12-18-2018, 06:33 PM   #13
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My guess is that the sail switch is sticking part of the time. Our 2002 19' is a little older than yours, but I suspect that the furnace is the same. We had two original control boards fail so installed a Dinosaur board. Later, when the igniter clicked three times and the furnace did not ignite, a Dinosaur technician suggested the problem was the sail switch. Replacing the switch fixed the problem for a year or so, then it repeated. Replaced the switch again and everything worked for a couple of months.

Getting tired of pulling the furnace out to get to the switch when things quit working, I banged with the handle of a screwdriver on the switch side of the furnace. Voila, everything worked. Since then I have had to repeat the process a couple of times and full function has always been restored.

Facing the furnace inside the trailer, the sail switch is on the right side about 1/2 of the way towards the back. I access that via the cabinet cutout for the propane detector.

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Old 12-20-2018, 03:57 AM   #14
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Lint and dog hair will wrap itself around the sail switch inside the blower wheel and prevent solid contact. It should be accessible from the outside by removing the furnace access panel. Itís a small black square on the blower housing with 2 screws holding it in place. Remove the 2 screws, pull out the switch switch and carefully clean it of debris and put it back. 5 minute DIY.
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