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Coleman 7900 Series Furnace. Fan comes on first then blower comes on. This is backwards.

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Combustion fan comes on first the blower comes on when it gets to temp so it can blow hot air ?

Posted on Dec 10, 2016


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Furnace reaches temperature set then shuts down and restarts 8 times before final shutdown.

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Nov 12, 2010 | Heating & Cooling

1 Answer

My coleman 7900 furnace blower cycles on and off while burner continues to operate

I would look at fan limit switch. They are normally located in electrical cotrol compartment. If your are lucky you will have one thats adjustable. It would helpful if I knew is your home a mobile or modular home as they usually use a button type limit on fan and hi limit. It sounds to me like you may be having problems with fan limit which controls temp. that fan comes on . Often what happens is that switch scenses temp to turn on and then draws cold enough air on return air to shut back down until temp.rises again.If this occurs when unit first comes on or continues after burner shuts off you can get a limit switch with a higher temperature rating or one that has adjustable temperature range. Hope this helps you.Thanks.

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Makes a noise, but the fan does not turn, it spins

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My furnace is in a 1994 manufactured home. It is

i think it is your fan because when it is supposed to come on (when hood is hot enough) it won't,...and when the gas valve doesn't get the o.k. from the fan that it is working, the unit will shut it self off so it doesn't over heat. Gas boilers and furnaces have alot of safety things like this,....see if the fan has an oiling place on it. I've seen control panels cause this too,....replace whatever is cheapest first. good luck

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Coleman 7900 gas furnace/central ac, was working fine, now blower wont come on, it tries but turns real slow then stops, i took it out and bench tested the motor andit works fine, put it back in the...

Motor run capacitor. If problem is intermittent, try wiggling wires from motor to capacitor to check for broken wires. Motor might seem to work ok with no load on bench but it has no real power. The power to really spin the motor under load comes from the capacitor

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