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ependydad's avatar
ependydad
Explorer
Apr 15, 2018

Atwood Furnace starts then stops - sounds water logged

We were gone all day today with the HVAC system off. We went to start the furnace; the fan would run for a bit and then would stop until we cycled the thermostat off and back on.

I first checked propane out at the change over valve and it’s showing green. I then checked the stove and was able to run all 3 burners for a bit.

I went outside to see if I could see or hear anything funky. It’s late so I didn’t take anything apart and can’t see anything. But I could hear it and it literally sounds water logged.

Here's a video of the noise:
http://www.youtube.com/watch?v=3X4_RXldhA0

I can honestly say I’ve never intentionally listened to my furnace ignite before, so maybe this is normal.

The outside temperature is about 60F. Inside temp says 67F and I’ve set it to 75F. It has rained for almost 24 hours straight- very hard at times. We HAVE used the furnace successfully before for hours at a time.

The 12v fuse seems OK. The LED light does not indicate a problem (though I know they’re unreliable). I pulled the fuse and the furnace doesn’t even attempt to start.

The furnace IS under the edge of a slide out’s slide topper rail that dumps runoff water directly onto it.

Any thoughts?

23 Replies

  • In 38 years of being a RV Tech, I have never heard such a noise from a furnace. The unit will have to be pulled to check it out. Water cannot get to the burner unless you shot water directly in with a water hose and even then it would take a minute or so for the water to get to the burner assbly. Rain water cannot get that far. Atwood has a 2 year warranty. Is yours still under the 2 years? Doug
  • Artum Snowbird wrote:
    I would think that you have a stuck "thing" in the furnace squirrel cage motor. It's stopping because there isn't enough flow to trigger the flow switch.

    But, that is my opinion.


    Would that make the warbling sound?
  • I would think that you have a stuck "thing" in the furnace squirrel cage motor. It's stopping because there isn't enough flow to trigger the flow switch.

    But, that is my opinion.

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