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Old 06-10-2010, 03:56 PM   #1
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Heil NG Furnace - Combustion blower never turns off


I have an investment property with a Heil Gas furnace and split A/C unit that appears to have been installed sometime around 2001.

The combustion blower on the furnace runs anytime the breaker feeding it is on. This happens even if I remove the thermostat from the wall plate, so I feel sure it's something internal to the furnace/air handler.

Any suggestions before I call a pro? e.g. reset switches, cheap and easy parts to replace or clean?

Thanks!

Heath

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Old 06-10-2010, 05:27 PM   #2
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Heil NG Furnace - Combustion blower never turns off


Air filter probably wasn't changed often enough. And now the high limit is stuck open.

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Old 06-10-2010, 06:36 PM   #3
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Heil NG Furnace - Combustion blower never turns off


I agree with beenthere "IF" it is the actual supply air blower that is always on when there is power to the unit. That is the default when the high-limit switch is tripped as a safety feature to try to keep the heat exchanger from getting to hot.

The way the question is worded though, makes me think it may be the draft inducer fan that is running constantly. If that's the case it could be a stuck or otherwise malfunctioning relay or possible control board problem.
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Old 06-11-2010, 01:25 AM   #4
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Heil NG Furnace - Combustion blower never turns off


It's the combustion blower that's stuck on - not the main fan that blows air through the vents in the house.

Thanks!

Heath
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Old 06-11-2010, 04:37 AM   #5
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Heil NG Furnace - Combustion blower never turns off


Disconnect the wire from the W terminal on the furnace board. If it still does it. Then good chance the board has a stuck relay.
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