lenox induced draft blower is screaming


The blower is making a horrible noise -- sounds like bearings to me, but on the net I saw mention of possibly some water? This is the induced draft assembly, not the big squirrel cage at the bottom. The blower is right in front of the firebox.
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Depends if you have a 80 percent or 90 percent furnace as to the draft inducer seeing condensate or not. If you dont hear a 'swishing of water sound' then you can rule that out. If the sound is a high pitched sort, then it does appear the bearings are failing....although I found a small dead bird in a draft inducer assembly which created a higher pitched whine. Shut off the power to the furnace then turn the inducer fan by hand/small screwdriver ....and see if you can duplicate the sound with the power off. Its more than likely bad bearings which requires replacedment of the entire draft inducer assembly : $$$
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On Thu, 18 Feb 2010 19:43:12 -0800 (PST), " snipped-for-privacy@gmail.com"

I would have sworn my draft blower bearings were bad on my furnace so I took it off to check and the bearings were PERFECT. The chirp was still there, so I looked more deeply into it - and noticed a bit of red "rust" around the hub of the blower squirrel cage. The disk of the blower was just a bit loose in the hub - the crimp was bad. I hit it with a bit of brass and the acetelene torch and no more chirp.
Just goes to show you sometimes need to look for the unlikely.
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I've replaced several of those. You can call a heating company. Or, if you're a do it yourselfer, you may be able to replace it yourself.
--
Christopher A. Young
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