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Old 12-31-2014, 08:57 AM   #1
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Furnace motor squealing

I just turned on my furnace for the first time. It is functioning but it sure is making a loud noise on the outside. It is a high-pitched sound that I am pretty sure is abnormal and will disturb my neighbors. Any suggestions? Thanks.
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Old 12-31-2014, 09:05 AM   #2
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I just turned on my furnace for the first time. It is functioning but it sure is making a loud noise on the outside. It is a high-pitched sound that I am pretty sure is abnormal and will disturb my neighbors. Any suggestions? Thanks.
Two possibilities....

- bearing on fan motor - put a few drops of oil on it

-The fan blades are hitting the housing - if there is a set screw on the fan you can move it.

It may not be as loud to your neighbors as you think, you could run it a while and see if it gets worse or not. Then take it to dealer later.

If you do not want to run it anymore, your rooftop A/C may have a heat pump or heat strip to keep you warm.
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Old 12-31-2014, 09:58 AM   #3
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Thanks Wayward. We are at home, trailer in the driveway. It is not a fan blade on the housing, but I guess it could be a bearing needing oil. Can I reach that with an oil spout without taking things apart? It has been running about 30 minutes with no change.
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Old 12-31-2014, 10:11 AM   #4
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Since it is a 2014, and your first use, it would be covered by the 2 year warrantee and I would advise you take it to your dealer for service.

The bearings in the motor generally are very very hard to access, and are permanently lubed, that is no service is needed or provisions to oil them made. It has been my experience with two or three older units (yours is new) that if you take them all apart and do manage to lube them, they start making noise again very soon.

You could have a mud dauber nest inside which is being hit by the blower wheel and also could cause the noises.
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Old 12-31-2014, 10:17 AM   #5
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If it is the bearings and if they have failed already use the warranty.
I would mark the furnace before you take it in so you can check and tell if they replace the furnace or just attempt the short term solution of oiling the bearing, a not acceptable solution.

Small electric motors often have a washer at the end of the armature that acts as a trust bearing. That is the point that causes this high pitched noise. There are very hard to get to and even if simple oiling stopped the problem it would not be a permanent solution.
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Old 12-31-2014, 10:17 AM   #6
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http://www.gmcmi.com/wp-content/uplo...Dyna-Trail.pdf

Page 11 under burner adjustment. Improperly adjusted burner will cause a screeching or howling noise.
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Old 12-31-2014, 12:50 PM   #7
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http://www.gmcmi.com/wp-content/uplo...Dyna-Trail.pdf

Page 11 under burner adjustment. Improperly adjusted burner will cause a screeching or howling noise.
Thanks for posting this - I'm going to check my own owner's manual for a similar adjustment. I replaced the fan motor already (it definitely was going bad), but the furnace has a high pitched whine with the new motor.
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