Carl n Susan,
I'm having a similar issue to this with my Montana 3711FL Atwood 8535 IV-DCLP furnace. I am getting a flame sense fault light code on the circuit board. It seems one thing after the other is going wrong with this unit. I have replaced circuit board, then it worked, then the blower motor started making noise and failed, that was replaced. While disassembled I replaced the burner head which was rusted through, the electrode was fine. It was cycling on and off normally for several days then suddenly it stopped cycling regularly. Hit the reset On blower and it worked again. Unit now fires up , I hear combustion and a few seconds later it cycles off and then tries to ignite again. Where should I start looking for my problem.
I cleaned the burner head area out as well when I had it apart found a few ladybugs hiding below the burner head when I removed it. I also feel like Im smelling a acrid smell from exhaust or something stronger than I remember in previous years ( I can not determine if it is propane Im smelling in the exhaust, or if I am just going crazy from frustration) . We are hooked to a large propane tank and everything else seems to be functioning well. I would like to note our propane is at 30% currently ,,,,would this cause a pressure issue? I feel like I have used it with less in the tank than that before. Any suggestions or tips would be greatly appreciated.
Thanks - Cline88
MOD Update: Post moved to a new Thread as the previous Thread was 8 years old and not applicable.
I'm having a similar issue to this with my Montana 3711FL Atwood 8535 IV-DCLP furnace. I am getting a flame sense fault light code on the circuit board. It seems one thing after the other is going wrong with this unit. I have replaced circuit board, then it worked, then the blower motor started making noise and failed, that was replaced. While disassembled I replaced the burner head which was rusted through, the electrode was fine. It was cycling on and off normally for several days then suddenly it stopped cycling regularly. Hit the reset On blower and it worked again. Unit now fires up , I hear combustion and a few seconds later it cycles off and then tries to ignite again. Where should I start looking for my problem.
I cleaned the burner head area out as well when I had it apart found a few ladybugs hiding below the burner head when I removed it. I also feel like Im smelling a acrid smell from exhaust or something stronger than I remember in previous years ( I can not determine if it is propane Im smelling in the exhaust, or if I am just going crazy from frustration) . We are hooked to a large propane tank and everything else seems to be functioning well. I would like to note our propane is at 30% currently ,,,,would this cause a pressure issue? I feel like I have used it with less in the tank than that before. Any suggestions or tips would be greatly appreciated.
Thanks - Cline88
MOD Update: Post moved to a new Thread as the previous Thread was 8 years old and not applicable.
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