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I have a 1971 mobile home and it has a coleman gas furnace in it modle #8665D766. I can turn the thermastate up and the combustion fan comes right on but the igniter never ignites. The pilot lite is lit. The combustion fan will continue to run until I shut the thermastate off by hand

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  • rabbitshay62 May 11, 2009

    I got the problem fixed

  • rabbitshay62 May 11, 2009

    I got the problem fixed

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It sounds as if one of the sensors is not signaling correctly, If the combustion fan is on. What you need to due is turn things off for a minute to test your sensors. Start by looking at the emission sensors. This can be done by looking at the schematic and following the line of electrical flow to the main switch. I had this same problem on a home furnace and all I did was follow that line of flow and checked the sensors by disconnecting each to see which one showed either an open or closed circuit, when it was supposed to be just the opposite. (Usually its supposed to be open if no flame is present, so you might see a short) It was in fact the sensor in combo to the igniter fan. If you don’t have the schematic I would look to Colman. All these circuits are simple circuits and very little trouble shooting to resolve. The hardest part is finding the parts to fix it. Thus the internet and the need for a schematic if you can find one. Most heating and air-conditioning outlets wont sell you parts even if you have an engineering degree and don’t want do deal with a technicians BILL.

Posted on May 13, 2009

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