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Coleman mobile home furnace Model #7966-756 will not turn on. The pilot light is lit, there is power coming to the step-down transformer inside the furnace. The reset switch is in the right position. It worked fine when i turned it off last spring, just wont start back up now. The blower fan will not even come on when i switch it from the auto position to the on position on the thermostat. Any ideas?

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I had a similier problem, Check your neutral ground? also alot of power companies will come out and do a basic check of the voltages going to the furnace, and can offer advice for free.

Posted on Dec 17, 2011

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When I turn the heater on, I here all the switches during cycle up but the gas never ignites. after a few minutes the furnace cycles down. The blower fan and AC work fine.


Make sure the pilot light is lit. if the pilot light is not lit I believe there is a safety switch that stops the flow of gas to prevent filling your home with it.

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How do you lite the pilot lite on a Rheem Gas Furnace Model #rgma-125a


If I recall correctly, model number Rheem furnace you listed has electronic ignition to light the pilot, when the home's thermostat calls for heat. Is this what you're having a problem with?

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I have an early 80's mobile home with an "intertherm gas atmospheric furnace" pilot light is lit but can't get the furnace to "fire". Seems as though the limit control is stuck open. ...


If your pilot light is lit then I would first check your thermostat. Make sure it is on heat setting and fan is on auto, turn stat up to where it should be calling for heat. If you don't get burner to light remove front cover from thermostat and see if it has a mercury switch, if it does move temperature selector up and down and see if you can see a spark in mercury switch vial. If y ou cannot see a spark remove screws that attach t-stat to base.Remove carefully and disconnect wires that go to r and w terminals on stat base. Temporarily connect these two wires together. This should make burner light if you have power to thermostat. If burner does light disconnect wires and replace thermostat. Also if you have a volt meter check across these two wires and see if you have power there. Should be around 24 volts a.c. If your thermostat has a fan on setting try that. If fan runs you know you have power to furnace The gas valve needs 24 volts to operate and inside the electric control box in furnace there is a transformer to step down 110-120 supply voltage to 24 volts. If transformer is working you should be able to hear a low buzz or humming sound. You can also check across gas valve terminals when t-stat is set for heat, you should read about 24 volts. If you have 24 volts to gas valve and it is not opening then you need to replace gas valve. The main purpose of the limit switches is to turn blower on when temperature in heat exchanger reaches fan on temp,shut off blower after burner shuts off and heat in heat exchanger reaches fan off temperature, and limit if temperature exceedes set point without blower coming on. I hope this helps you. Thanks

Nov 25, 2010 | Air Conditioners

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The Pilot on my electric furnace will not stay lit, blowing cold air instead of warm. The model is L8T-UH.


Is this a code for us to come over cause electric furnaces dont use a pilot light ha! Ha! (they uses electric heat strips for heat .....but if you want to give away money..........)

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1 Answer

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1 Answer

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1 Answer

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1 Answer

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1 Answer

Mobile home furnace


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1 Answer

Pilot light will not stay lit


Will it stay lit for a while? If so light the pilot light, Turn on the blower fan, and watch the pilot light. Look for any air that's blowing the pilot light around. if the pilot lite is moving around then you could have a bad heat exchanger. If so you should get a carbonmonixide detector and have your furnace inspected for this. One thing to check also is make sure the thermocouple is at least 1/4 inch into the flame.

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