akpolaris
Well-known member
I have a forced hot air, oil fired, down draft furnace. recently there seems to be a moaning noise when it is operating. Where to start looking for the problem??
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an alternative browser.
You should upgrade or use an alternative browser.
Furnace noise
- Thread starter akpolaris
- Start date
James-W
Well-known member
If you only hear the noise when the blower is turning, then i would suspect the bearings/bushings are going out.I can definitely hear the noise when the blower is turning after the burner has shut down. Not sure yet if it is going when the burner is lit. Possibly bearings or bushing in the squirrel cage?
Some motors are not meant to be repaired, that is to say they are spot welded together. I suppose it is still possible to get them apart and repair them, but then you need to spot weld them back together again. I doubt it would be worthwhile. If that is the case, I would just get a new motor instead of screwing around with it. Hopefully yours is the type that can be taken apart and repaired.
I despise this whole disposable society and components that are not repairable for just this reason. When I get back into town from work I guess it will be the next project. Or better yet I can wait until it is cold out and dismantle the heating source just to give my wife something to nag at me about.
If you only hear the noise when the blower is turning, then i would suspect the bearings/bushings are going out.
Some motors are not meant to be repaired, that is to say they are spot welded together. I suppose it is still possible to get them apart and repair them, but then you need to spot weld them back together again. I doubt it would be worthwhile. If that is the case, I would just get a new motor instead of screwing around with it. Hopefully yours is the type that can be taken apart and repaired.
BillK
Well-known member
Before you condemn anything mechanical make sure all of your registers are open and the filter is clean. Mine will let me know when the filters are getting dirty by making a moaning sound.
I despise this whole disposable society and components that are not repairable for just this reason. When I get back into town from work I guess it will be the next project. Or better yet I can wait until it is cold out and dismantle the heating source just to give my wife something to nag at me about.
You should be able to just power up the fan that move air in the ducts (squirrel cage) without firing up the burner and see if that noise is from the fan... It's realtively easy to take that out as well to inspect if it is clogged with dust...if you take of the right bolts and screws, they just slides out... and you can just power it up, there is usually a diagram next to it... at least the ones for my parent's furnace is like that. I had to take it out to clean up some spills... it was simple to do. Just watch for sharp metal edges... as in any sheet metal works.... I was cut and didn't even notice. The motor and fan is absolutely replaceable( just not cheap if I go with buying new).. then again not sure about your particular one.
Not the squirrel cage fan but the fan on the oil burner blower did make that noise when it is clogged up with crud... I just use a flat head and small wire brush, then slowly take those out as much as I can. Their oil burner is a Carlin which is the same as a Beckett AF1... dual shaft motor, one end powers the blower for the air and the other end powers the pump for the fuel...direct drive... you can still power it up just shut off the oil and identify the motor wiring... its usually 120V motor.
Last edited: