Furnace's Blower Is On All The Time But Gas Burner Does Not Start - HVAC - DIY Chatroom Home Improvement Forum

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Old 01-10-2008, 05:51 PM   #1
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Furnace's blower is on all the time but gas burner does not start

Hi all.
This is my first time in here. Happy New Year!
Please help me with this:
My furnace's blower stays on all the time, even if the thermostat switch is set to Auto. The pilot is working properly, but the gas burners never come on.


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Old 01-10-2008, 05:57 PM   #2
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Furnace make and model please.


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Old 01-16-2008, 05:44 PM   #3
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It is most likely a fan limit switch. Some fan limits have a little white button on them to turn on the blower. Push it in for manual, and pull it out for automatic. It is usually on a little silver box often on the front of the furnace. Sometimes they are on the plenum close to the top of the furnace. Or behind a service panel in the front. Otherwise it could be a short in the T-stat wires, or a bad fan relay.
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Old 01-16-2008, 05:46 PM   #4
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If you have AC, make sure the thermostat in not set to FAN ON mode...

guess I didnt really read your post..., if you have more than one zone check that tstat as well, and like mentioned above check the fan limit switch... located on the furnace, you should know that the fan is controlled by a relay, so you either have a short in a wire OR some other control is turning the fan on.

Last edited by chris75; 01-16-2008 at 05:49 PM.
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