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In my mobile home I have a coleman furnace model number 7970-856. It was over 100 degrees today and my furnace fan is stuck running and I don't now if it's supposed to do day. There is no fan switch on the wall thermostat and I am not sure if the fan is stuck on.

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There is a fan cycle switch that turns on the fan when the unit heats up (so it won't be blowing cold air) and runs the fan after the unit has shut off to remove heat from the unit. Sounds like it bit the dust. It is located next to the firebox.

Posted on Jul 29, 2009

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Is this a blend air system? If so, there is an upper & lower control board that communicate to each other, and if the exhaust fan on the roof is out, it will give you intermittent issues. The fan mixes or blends outside air with the return of the air handler, & duals to pressurize the attic. These were installed due to mobile homes built too air tight. Without this fan, your roofing shingles will curl, and your roof decking will bow prematurely.

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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....


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.

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Peace,




It seems you need hands on servicethis time !
ngafm
Bless You,
Please leave me a rating before you sign off!
Thank You

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