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Old 11-08-2019, 10:14 AM   #1
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Atwood heater issues

During a heavy rainstorm, with the heater turned off, suddenly the heater fan began to kick on and off randomly (fan only, not the furnace). It would only run for a few seconds, and shut off for a few and then back on. Eventually, it came on and stayed on. The only way I could shut it off was to remove the outside cover, and remove the power wires running to the circuit board.

I replaced the circuit board, and now the heater (fan and furnace) will not come on through the thermostat controls. The thermostat does work for the a/c setting.

So, what happened? Is the fan motor shot? Is there something going on with the fan/furnace that is keeping the thermostat from functioning? Or is there an issue with the thermostat that is keeping the unit from coming on?

I did not have a chance to see if the power leads were hot after the rain incident. I did however notice that there was a discrepancy in two wiring diagrams. One indicated that the wire connected to the round spark control was red in color and another indicated that it should have a black wire attached. I assume that the red will power the spark control and the black will ground it. It did not work with either connected. I did check fuses and circuit breakers and they were fine.

Thanks much for helping... kip
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Old 11-08-2019, 10:51 AM   #2
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MODEL????


Check the on/off circuit breaker on furnace frame or motor cover has tripped....manual reset


Might have caused it to trip when messing around with the wiring.
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Old 11-08-2019, 11:21 AM   #3
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I don't know what model the heater/furnace is, and the camper is not near by to check easily. It's in a 2016 Prime Time 28' Avenger (I know this probably doesn't help - sorry).

Where is the circuit breaker you mentioned located? I have checked the breakers and fused located in their respective boxes. I did not notice any near the furnace, but I wasn't looking for one either. thanks
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Old 11-08-2019, 11:41 AM   #4
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Do you have an external panel to access fiurnace.....undwer that cover on the furnace frame OR on the motor cover would be where the on/off switch (circuit breaker) would be located.
Manual reset.....if tripped NO DC from T-stat to trigger Fan start which then satisfies the other requirements for DC to circuit board.


You mentioned 2 wiring diagrams.......where did you see them?
That is why Model is important----RV Furnaces are pretty generic but each has its own nuances.
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Old 11-08-2019, 12:54 PM   #5
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Hope you still have the original circuit board and the instructions for the replacement board. Check the jumpers on the new board match with what is in the directions and/or on the old board.

Had to replace ours last year because of a leaking furnace door.
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Old 11-08-2019, 02:27 PM   #6
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I don't remember where I saw the two differing diagrams. I believe that one was in the owner's manual - ground wire going to the spark coil. And the other was online. I went on line because the directions with the new board were not clear at all. Then, of course I found the two differing diagrams. I followed the owner's manual.

I did keep the old board. I called the maker of the new board (Dinosaur?) and they could not help me because I did not break the old board and did not have a volt meter with me.

So, I'll go to the camper and find a model number and check for a circuit breaker in the outside compartment. I looked around in there while changing in the new board and do not remember a circuit breaker or switch. But, I'll look again.

Thanks much...more later. kip
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Old 11-08-2019, 02:58 PM   #7
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In this picture the on/off switch (circuit breaker) is the small black box/2 pink connectors left side just above the 'label' on motor cover
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Old 11-13-2019, 12:00 PM   #8
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Sorry for the long delay, it took a while to get over to the camper.

The model number is AFMD30111 A

And, I did find the reset switch in the outside compartment. And it was in the off position.

So, if I take the camper battery, the new circuit board, reset the switch, then all should be well? I assume the heater will run (at least a short time) off the battery? Thanks much - kip
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