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DonMichUP's avatar
DonMichUP
Explorer
Oct 23, 2017

Problem with Atwood furnace

Hi everyone. I have an Atwood 8516DCLP in my 1999 Alaskan Camper that worked wonderfully, but then all of a sudden stopped firing up. Fan would blow (common thing with the circuit board it has) but no ignition sound. I was going to trouble shoot the solenoid gas valve coils, and then the sail switch... considering that 75% of circuit boards are not faulty and replaced for nothing... and realized that I'd have to access the furnace from the inside of the camper so began taking cabinets and compartments apart. Good thing I did.

On the camper wiring that goes to the furnace, along with the thermostat wires, is a white wire that attaches to a yellow wire and then a plug connection. Alaskan says that the white wire is ground. From there the wiring goes to the furnace. The yellow wire's insulation was melted, exposing bare wiring. Good thing there wasn't a fire! I've included some photos. The furnace is only runs off the inverter from 120V shore power, no battery connection.

Any idea what might have caused this?? I'm at a loss. And after seeing that melted wire, pretty concerned. I see that the wiring was damaged after the wiring clamp, but not before that. So I 'do' wonder if that has something to do with it(??).
Don







  • blower motor could be going bad drawing excessive current. bad bearings? and does not spin fast enough to activate the sail switch. or mud daubers nest in intake or exhaust?
  • Thanks, I'll check those things out. There's no house battery on board, I run things via 120V shore power to converter. Sometimes, I've raised the top of the camper using a 2000W converter that I have installed in my truck, and I've also frequently used a pure sine wave Yamaha generator for my power. The generator was never grounded. And I know for a fact that the camper also is not grounded to my vehicle.
  • What it almost looks like is the entire ground of the rig was being carried by this conductor.
    by this manual, it looks like the ground for the entire system went through the yellow conductor then went to true ground via the terminal mounted to the fan housing.
    Open the 12 volt DC system and see if there is a missing ground to the battery and frame of the rig.
    Check the yellow conductor going to the thermostat.
    Check the black conductor to the motor.
  • Yeah, pretty serious stuff enblethen. The furnace ran great last winter and this year to Alaska and while in Alaska on my month long trip. If that's the ground wire, weird that that would melt and not the hot wire. Alaskan Campers replied, "Don, The campers white wire is the ground. Sounds like somebody wired a plug wrong." After the conductor/plug, on the 'way' to the furnace, the wire is just melted a little. I added that pic above. No melted wire going into the furnace.
  • That was an extremely overloaded conductor. I see that the pin going into the furnace is melted.
    What does it look like inside the furnace?
    I would do more searching to see what caused this overload.

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