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Furnace Blower cycles on & off

I have a Intertherm forced air gas furnace model#MGHA075ABFC-01 in my mobile home and recently after the burner fires up the blower comes on for a few seconds and shuts down and continues cycling as long as it keeps calling for heat. I understand that this is normal for the blower to shut down until the temperature is high enough in the heat exchanger but this cycling goes on for hours. The heat ducks get so hot, you can't touch them. Is there some sort of sensor or swith that might be malfunctioning and how can I test it? I have some electrical testing equipment. Thanks.......Guy

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Check out the fan switch on the unit and make sure that its the correct one. it should cycloe on @ 120 degrees and cycle off around 100 degrees. Someone may have put in a different one and that is not the approve one.

Posted on Dec 23, 2008

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Posted on Jan 02, 2017

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