Gas and Oil Home Heating Furnaces - blower on my furnace goes on and off all the time

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kathie
02-06-05, 06:53 AM
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I dont know why when my furnace comes on that the blower comes on and off, sometimes in just seconds from coming on it goes off and on again .
can you help me or is this just the way it is supposed to work?

:rolleyes:

Jay11J
02-06-05, 07:05 AM
How old is it?

If it's an older one say over 12 + years, you'll have a fan limit control that maybe set too close, or it's just getting weak.

How's the air filter?
kathie
02-06-05, 07:14 AM
It is an older unit, not sure how old, but we change the filter every month.
Ill try to find out how old it is

Jay11J
02-06-05, 07:22 AM
What make and model is it too..
Grady
02-06-05, 07:27 AM
Any furnace with a snap action type fan control is subject to this fan short cycling. It happens when the fan switch gets weak. Mobile home furnaces are the most notorious for this problem.
kathie
02-06-05, 08:20 AM
its a HEIL and the modal #NUGK100DH05 its also a 1986
Grady
02-06-05, 08:33 AM
If I'm not mistaken, & I could be, the NUGK used a Camstat fan/limit. The Camstats are a snap action contol. I will try to find out for sure. What happens if you set the fan switch on the thermostat to "ON" rather than automatic. If the fan continues to short cycle, I would suspect a bad fan motor or capacitor.