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Old 11-28-2021, 06:42 PM   #1
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Furnace blows air but doesn't fire up

We were boondocking last week and furnace worked fine for the first 5 days then quit so I tried turning it off and back on and the fan came on for 15 seconds and shut off tried numerous times same thing did research and it pointed towards the sail switch took it apart sail switch was fine my next thing is the limit switch any suggestions would be greatly appreciated.
Thanks
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Old 11-28-2021, 06:50 PM   #2
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My first thought was the sail switch too. Out of propane?
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Old 11-28-2021, 07:53 PM   #3
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Have you had much rain lately?
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Old 11-28-2021, 08:57 PM   #4
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My first thought was the sail switch too. Out of propane?
nope 3/4. Normally if propane is empty the ignitor still clicks all I get is fan comes on for 20 seconds then shuts off
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Old 11-29-2021, 06:57 AM   #5
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Possible itís the control board. They can get wet. I keep a spare one just for that. You may try taking a hair dryer and drying it.
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Old 11-29-2021, 07:33 AM   #6
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Possible it’s the control board. They can get wet. I keep a spare one just for that. You may try taking a hair dryer and drying it.
My furnace did this on a long trip last spring. I couldn’t find a cause and took the RV to the independent repair shop I use to fix it. It turned out to be the control board failed. It works fine now.
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Old 11-29-2021, 09:37 AM   #7
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My furnace did this on a long trip last spring. I couldnít find a cause and took the RV to the independent repair shop I use to fix it. It turned out to be the control board failed. It works fine now.
If it's not the limiter switch that will be next. Thanks
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Old 11-30-2021, 06:37 AM   #8
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If it's not the limiter switch that will be next. Thanks
The limit switch is an easy check. Just check continuity from one side to the other. I believe if your fan is running the switch is ok.
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Old 12-05-2021, 06:17 PM   #9
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Mr Buddy

We use a Mr Buddy heater to avoid running our batteries down when we need heat while boondocking. Or you can use any other catalytic heater to do the same.
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Old 12-05-2021, 06:57 PM   #10
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Quote:
Originally Posted by Brooks View Post
We were boondocking last week and furnace worked fine for the first 5 days then quit so I tried turning it off and back on and the fan came on for 15 seconds and shut off tried numerous times same thing did research and it pointed towards the sail switch took it apart sail switch was fine my next thing is the limit switch any suggestions would be greatly appreciated.
Thanks

As many others have mentioned, your control board is the likely culprit. If it gets wet, it fries rather easily.
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Old 12-05-2021, 07:53 PM   #11
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Originally Posted by Brooks View Post
We were boondocking last week and furnace worked fine for the first 5 days then quit so I tried turning it off and back on and the fan came on for 15 seconds and shut off tried numerous times same thing did research and it pointed towards the sail switch took it apart sail switch was fine my next thing is the limit switch any suggestions would be greatly appreciated.
Thanks
just to let you all know it turned out to be my limit switch. Thanks for all the suggestions....let's go!
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Old 12-05-2021, 09:27 PM   #12
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just to let you all know it turned out to be my limit switch. Thanks for all the suggestions....let's go!

Great, just be mindful that it can also be as simple as the battery getting too low to spark the igniter well enough or the flame sensor not clean enough to provide confirmation of a flame being present. On many the igniter also is the flame sensor.
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