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93ToyTruck's avatar
93ToyTruck
Explorer
Jan 12, 2016

Atwood furnace won't ignite

I've got an Atwood 8535-IV-DCLP that won't ignite. The blower runs, I hear it click, smell propane out of the exhaust, then it eventually clicks off. There is a small bulb on the circuit board next to the igniter but I didn't see it light up. I also didn't leave it on long after failing to ignite because of the propane in the air. Is this supposed to light up while igniting or after going into a failed state?

There is a lot of soot. I blew out as much as I could with my air compressor. I'm wondering if the soot caused the electrode to foul. The troubleshooting document says that a faulty motor could cause the sooting. Could this be caused by a slow moving motor or just if it stops working all together?
  • 93ToyTruck's avatar
    93ToyTruck
    Explorer
    Jan 29, 2016
    Success! I replaced the electrode and it now works. The service manual says that the controller detects current draw to verify that it's sparking. Apparently it was enough to ignite but wasn't drawing the correct amperage.
  • dougrainer's avatar
    dougrainer
    Nomad
    Jan 29, 2016
    93ToyTruck wrote:
    Success! I replaced the electrode and it now works. The service manual says that the controller detects current draw to verify that it's sparking. Apparently it was enough to ignite but wasn't drawing the correct amperage.


    The flame generates a return AC current that the Circuit board Piezo detects to know there is a flame. The Spark Electrode does double duty. Doug
  • BoonHauler's avatar
    BoonHauler
    Explorer
    Jan 29, 2016
    Thanks for the update.

    I'll let you all know what the verdict is on mine just as soon as I hear back from Atwood.

    FYI, mine is a brand new 7920-II.

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