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drtbk4ever 01-14-2013 12:24 PM

Carrier squeals
 
Hey guys,

Over the last few months, we often hear a sqeal from our Carrier High efficiency 2 stage furnace as the blower drops out of high to low speed. It is short in duration and WAS only heard with the change in fan speed. No squeals or squeeks while fan is running. Then the other evening, I heard it as the blower went from low speed to high (it was a very short squeal).

I did a search here and learned it may be the blower fan is a bit loose and it moves as the fan speed changes.
And a few threads point to bearings on the blower motor starting to go.

Any thoughts?

I'm hoping it an easy fix as I don't want to have to replace the blower. The furnace is only 6 years old and of course, warranty ended at 5.:furious:

joecaption 01-14-2013 12:51 PM

Belt driven?
Change the belt and make sure every turns freely when it's off.

drtbk4ever 01-14-2013 01:07 PM

I didn't know the fans in these newer furnaces were still belt driven? I'd definitely prefer the cost to fix that than having to replace the entire motor.

I'll check into that in the next day or so.

jagans 01-14-2013 03:38 PM

Ill bet the set screw came loose on squirrel cage to the motor shaft.
Easy fix. Pull the Blower out off its rails, Take the motor off the blower
housing. remove the blower cage and clean it rel good. If you have a laundry sink, fill it up add TSP a little bleach and dish soap and let it set to loosen the crap in the buckets. Wire brush the buckets with a small wire brush.
Put Blower set screw back with blue Loc-Tite

drtbk4ever 01-15-2013 10:37 AM

Quote:

Originally Posted by jagans (Post 1093399)
Ill bet the set screw came loose on squirrel cage to the motor shaft.
Easy fix. Pull the Blower out off its rails, Take the motor off the blower
housing. remove the blower cage and clean it rel good. If you have a laundry sink, fill it up add TSP a little bleach and dish soap and let it set to loosen the crap in the buckets. Wire brush the buckets with a small wire brush.
Put Blower set screw back with blue Loc-Tite

Sounds easy enough but I'm thinking I'll have the HVAC guy check this. I'm scared I won't be able to get it back together and we'd be without heat for a day or two.

old_squid 01-15-2013 01:53 PM

Quote:

Originally Posted by drtbk4ever (Post 1093965)
Sounds easy enough but I'm thinking I'll have the HVAC guy check this. I'm scared I won't be able to get it back together and we'd be without heat for a day or two.

:laughing: That was in the fine print disclaimer that came with his instructions.

drtbk4ever 01-23-2013 03:41 PM

Seems like it may have been a loose screw. Seems ggod now immediately after tightening so let's hope that was the problem.


Thanks for everyone's input.


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