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Old 06-26-2011, 09:53 PM   #1
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Combustion air fan on my furnace


The combustion air fan on my furnace has jammed up. When I put the heat on, an electric hum is all I get until I go to the furnace and spin the fan shaft with my hand to get it going. Then the furnace works as normal.

Is it worth cleaning the fan, or should I just replace it?

When I tried to take it off, there were three obvious screws that I unscrewed, but the fan, though very loose, did not come out. Is there a trick to it?

As I'm not much of a DIYer, I'm also wondering if this is the kind of job I should attemp. Maybe get a pro?

My furnace is a Lennox G50UH 24A-070-03

Thanks...

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Old 06-27-2011, 05:52 AM   #2
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Combustion air fan on my furnace


I would get a Lennox tech to do it. Quite complicated with 2 gaskets to hold in place and the replacement is a retrofit and needs a different pressure switch with it. Fan and motor come as a unit.

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Old 06-27-2011, 08:20 AM   #3
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Combustion air fan on my furnace


Thanks for the prompt reply. I will do just that.
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Old 02-14-2014, 09:52 AM   #4
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Combustion air fan on my furnace


Quote:
Originally Posted by yuri View Post
I would get a Lennox tech to do it. Quite complicated with 2 gaskets to hold in place and the replacement is a retrofit and needs a different pressure switch with it. Fan and motor come as a unit.
The combustion chamber fan just started making noise. Sounds like a bearing is failing or needs lubrication.

Do I need a new fan assembly or can I remove it and lubricate it?
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Old 02-14-2014, 12:46 PM   #5
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Combustion air fan on my furnace


has sealed bearings so you need a new unit.
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