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The Coleman Mach thermostat in my 5th wheel blows its 2 A fuse a couple of times today and am trying to figure out what is causing this. Please help. I am unable to get the furnace to run even with a good fuse in the thermoatat. When I bypass the thermostat to run the Atwood furnace (red tied to white wire). THe furnace blower comes on and the burner sounds it lights for 5 seconds and then goes out. 15-20 seconds later it reignites and goes out and continues to cycle -- the blower motor runs the whole time. Please help

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  • benmorris460 Apr 22, 2009

    Rylee



    Could the short be coming from the furnace -- as the furnace is not working properly (this was the reason that I started in on the thermostat to start with.



    thanks

    Ben

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Hi

Its blowing fuses because of short circuit inside the coleman mach or due to two wires being shorted with each other. You'll need to open up your thermostat system to look for the short circuit and also shorted wires.Please look at the service manual of your Coleman Mach thermostat---

Coleman Mach thermostat service manual


Please do accept this solution and revert for further assistance.

Thanks
Rylee

Posted on Apr 22, 2009

  • Rylee Smith
    Rylee Smith Apr 22, 2009

    Hi Ben



    It could be the furnace . You need to check the white wire i.e the furnace control wire from the thermostat furnace blower operates independently from sequencer or time delay in furnace.



    Please do accept this solution and revert for further assistance.

    Thanks
    Rylee

  • Rylee Smith
    Rylee Smith Apr 23, 2009

    Hi



    Yes the short circuit can also be due to the furnace. There maybe be two wires shorted inside the furnance. You'll need to open the furnance and would need to inspect for shorted wires. If you are unable to find then use a multimeter. Please look at the service manual of your Coleman Mach thermostat for more details---

    Coleman Mach thermostat service manual

    Please do accept this solution and revert for further assistance.

    Thanks
    Rylee

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