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Furnace will not kick on.

I have just relocated the thermostat connected to a ComfortMaker model C9MPV075F12C1 furnace and now the furnace will not turn on. I was very careful in labeling the wires before disconnecting and the furnace worked fine before the change. The diagnostic LED is flashing ''heartbeat'' indicating no problems. Any suggestions?

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Sounds like you have a problem with your module, it is kind of triky troubleshooting the module you have to know what you are doing, and becides it is a spencive part,and perhaps you may want to try to buy it.Or we can try something alse like whats your location?

Posted on Nov 15, 2009

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Posted on Jan 02, 2017

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Home owner's manual? Troubleshooting section. Gas or electric?
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I have a honeywell thermostat model # th5220d1003-0636 & need to know what connections to make for gas forced air heat.


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