Furnace Buzzing Then Stops

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Old 02-09-19, 02:39 PM
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Furnace Buzzing Then Stops

Hi, I my furnace has been making a buzzing sound recently. I first noticed it last week when the furnace was firing up there would be a buzzing sound for about 5-10 seconds before air started coming through the vents.

Then, yesterday the buzzing sound was even longer, and instead of air coming through the vents the furnace would stop.

I opened up the furnace to see what was happening. The igniter starts but when the blower should have started there is a buzzing sound and the flame goes out.

I thought it was the blower motor so I took it out and cleaned everything. After I started it up again there was no buzzing sound so I was relieved for a second, but then the blower fan was making contact with the enclosure.

I took it out again and adjusted it, but it back and started it up. There was a buzzing sound for a few seconds but it did start up, so I was relieved for that because it is freezing right now.

For now I just want to get the temperature up to a normal level, but I am wondering what I should do. .Does the motor need oil, or will I need to replace it? Or could it be something else?

Thank you in advance.
 
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Old 02-09-19, 03:08 PM
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For the most part..... those are sealed bearing motors.
You could try oiling it to get it to run temporarily but it sound like it needs to be replaced.
 
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Old 02-10-19, 02:46 PM
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Buzzing motor

If itís the bearing it wonít get any better and all you can do is replace the motor, but itís also possible that itís a weak capacitor causing the motor to start sluggish and noisy. Itís worth the $3.00 - $4.00 dollars to eliminate this possibility. If it still starts noisy then your buying a motor anyway and who knows it may take the same size capacitor.
 
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Old 02-11-19, 10:16 PM
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Thanks for the advice PJmax and riostr.

I don't know if this helps, but here is exactly what happens.

- the flame gets lit
- right when the blower starts there is a fairly loud buzzing/grinding noise
- as the blower picks up speed the buzzing/grinding sound get less and less
- by the time the blower reaches full speed the buzzing/grinding sound is gone
 
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Old 02-11-19, 11:33 PM
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It sounds like a problem with the motor but that's the best we can tell you.
If the blower wheel is not physically hitting ...... then it sounds like you need a new motor.
 
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Old 03-03-19, 06:34 PM
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I took some time messing around with it hoping it wasn't the motor. Ended up being the motor. I replaced it and everything is fine now. Thanks everybody.
 
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Old 03-03-19, 09:17 PM
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Thanks for letting us know how you made out.
 
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