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Coleman furnace fan keeps turning off and on every 10 seconds...

Coleman Furnace Model 7680B Series 856
Sometimes this furnace runs perfectly, but about once a day the fan seems to get stuck or something and it keeps going on and off every 5 to 10 seconds---when it does this there is no fire in the box, just the pilot light is on. I have to turn ithe furnace off for about 30 minutes and then it will run okay for about six hours or until it does it again. Any ideas? It has 3 limit switches that I am aware of.

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  • Satellite2 Nov 20, 2008

    Mine does the same thing after every heat cycle. About 15 seconds after the heat shutd off, the fan starts and goes off/on off/on maybe 29 times before shutting off.

  • seafroggy22 Dec 17, 2008

    When heater is turned on, the fan periodically starts going on and off, on and off, on and off.....until it starts driving me a bit crazy. Then I go to the thermostat and turn if off (push lever all the way to the left) and it still takes several minutes to stop going on and off, on and off, on and off.......The gas regulator was replaced last year and okayed by the gas company. He also checked the thermostat and said it was working fine.

  • deadcandance Mar 16, 2009

    Mine has the same problem, is anyone listening? Help

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Clean your heat/flame sensor with sand paper or steal wool. If the sensor is dirty, it won't detect the heat from the flame and it shuts the gas off. Clean the soot and junk off the sensor and it should work fine. I have to clean mine every year. After spending hundreds of $$ every yr on tech calls..I figured out the problem and in 30 sec I'm up and running again.

Posted on Jan 03, 2011

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