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When thermostat is moved to increase temp in the house, the furnace will not come on. I can hear the furnace cycle through the 3 cycles and then it shuts off without the furnace actually engaging and turning on. One time I wiggled a wire coming off the fan and it did come on but has not since then. We live in a manufactured home, 2204 sq ft built in 1997.

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  • cmgowler May 28, 2011

    Thanks for your reply. The furnace is very clean, filters are new and clean. There does not appear to be a red high limit switch as you described, but, being unfamiliar with furnaces, I'm unsure what the high limit switch would look like. There is an "on - off" red switch/lever for the gas supply but, other than that, the only other "red" is a band around a small fixture that looks sort-of like a tire pressure valve covered with a rubber cap. When I take the black rubber cap off the small fixture, I see the "valve" (?) that appears to be like a tire pressure valve. As for the flue, I'm unsure how one might go about checking to see if the flue pipe is blocked.

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The high limit switch popped or the flue pipe is blocked. This is a fairly common problem. Also check your filter make sure that it is not clogged if it is clogged then your furnace will pop the high limit switch, depending on the year that you have you can depress the red button and reset it

Posted on May 27, 2011

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