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Author Topic: Atwood Furnace Problems  (Read 567 times)

pomology

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Atwood Furnace Problems
« on: September 11, 2019, 08:47:32 AM »
I have a problem with the Atwood furnace on my 5th wheel (2019 Montana High Country )

I just bought the unit second-hand six months old from a private seller and have never used the furnace system before. (The person I bought it from never used the furnace either because they had free electricity at the RV park). When I turn up the thermostat and go outside, the furnace blower turns on, and the sparker clicks to ignite gas. I smell pretty strong gas exiting the exhaust pipe and actually hear the flame briefly ignite for -1 second or so, and feel a brief rush of hot air. Then the flame goes out. The sparker attempts to re-ignite, I feel a rush of heat for a -1 second, and then the flame goes out. This happens repeatedly over and over again until the unit finally times out and the red LED has the 3-blink pattern.

Things I've tried:

1) All the other propane appliances work. Stove works fine, gas water heater (which is right beside the furnace) also works perfectly.

2) Propane tanks are full.

Any ideas of what I should try next would be much appreciated!

Thank you!
Randy

Gary RV_Wizard

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Re: Atwood Furnace Problems
« Reply #1 on: September 11, 2019, 09:08:51 AM »
Most likely something is interfering with the air intake or exhaust, which messes up the air/fuel ratio. The furnace is very sensitive to that.  Common causes are insect nests, spider webs, etc. in the twin tubes to the exterior. Remove the outside access door and vacuum or brush out the tubes. Hopefully that's it.
Gary
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Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL

pomology

  • Posts: 2
Re: Atwood Furnace Problems
« Reply #2 on: September 11, 2019, 10:32:47 AM »
Thanks. The blower runs constantly for several minutes, with the sparker attempting to light every few seconds through that time period. It's like the flame just flickers in there before going out every time. I feel a burst of heat and that hollow "whooshing" sound that happens when the flame ignites, only for it to immediately go out. Only after several minutes does my unit go into lockout mode.

I'll clean those tubes today and report back!