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Furnace does not fire up but fan runs

Gas is on thermostat is working and calling for heat.

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  • 148 Answers

For older model check pilot light a newer model check limit switch if you igniter is lit.

Posted on Nov 24, 2013

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Posted on Jan 02, 2017

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SOURCE: Furnace starts, but no heat nor fan operation.

If youe burners fire off it's not the transformer. It suonds like the fan/limit control. Try to turn the fan switch on the thermostat to the on position and see if the fan comes on, if it does leave it on and turn the heat on and see if the heat works that way. If so it would be the combination fan/limit control.

Posted on Feb 07, 2008

  • 659 Answers

SOURCE: Rudd furnace

You have a safety limit switch that is either bad or needs to be manually reset. Some have little buttons between the two wires going to the switch that you can push to reset. If not they are automatic switchs then one is bad. You have to do an ohms test to see if each switch is bad or good.

Posted on Jan 05, 2009

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SOURCE: Lennox G40UH-60D-135-14 Furnace will not ignite

Do you have an inducer on the unit (no access to the lennox model number tonight)? That is a motor that comes on shortly before your unit fires that blows the combustion gases up through the flu. Does this motor come on at all if you have one? If it does and the furnace will not light, then there is a device on the unit called a pressure switch. This switch has two wires to it and a small tube that leaves it and goes to the inducer housing. Remove the tube from the inducer and blow into and draw in air lightly or until you hear clicking noises. Replace the hose and try again. Sometimes the pressure switch gets stuck but can also go bad. If everything is coming on all the way up to ignition but the unit won't come on, then it's probably one of the limit switches that need to be reset. These are little disks about the size of a penny and have two wires going to it. In the middle is a small button that can be pushed to reset it. Some units have 2 to 3 and others have more. You have to use a flash light and look all in the unit around the burners and around the flu pipe looking for the limits. Once you have found them all and tried to reset the unit, then try to start it up again. Hope this helps.

Posted on Apr 04, 2009

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Furnace starts, but no heat nor fan operation.


If youe burners fire off it's not the transformer. It suonds like the fan/limit control. Try to turn the fan switch on the thermostat to the on position and see if the fan comes on, if it does leave it on and turn the heat on and see if the heat works that way. If so it would be the combination fan/limit control.

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