Noise in heating cycle

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  #1  
Old 12-02-02, 01:54 PM
damita
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Noise in heating cycle

I've noticed this year, since the start of the heating season, that our furnace will come on and be fairly quiet until the burner shuts off and the blower continues through the cycle. At that point, there is a loud "whining" noise that continues until the blower turns off. The noise is hard to describe...but it is continuous and very loud. All other aspects of heating seem to be running fine.

This is an older (15+ years) propane forced air furnace.

We have checked to see if the noise is coming from the burner area or blower and it doesn't appear to be. We haven't been able to locate where the noise is coming from but it does sound out in all vents.

Any ideas what might be causing this noise and how to go about stopping it?
 
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Old 12-02-02, 02:05 PM
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When was the last time the furnace was worked on or looked at. Have you oiled the blower or motor at all in the 15 years?.Does the blower motor have a belt on it?It there anything in the blower wheel?ED
 
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Old 12-02-02, 04:00 PM
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damita:
I agree with ED.
It is likely the blower motor or fan bearings.
 
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Old 12-02-02, 09:05 PM
damita
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blower noise

Hi,

Yes, it has been oiled. No, it doesn't have a belt.

The noise starts after it's been on for awhile (5 minutes or so) and quits immediately after the flame goes out (my error in original posting).

Today, it's not even making the noise....first in many many days (it's running right now as I time it and wait, wait, wait for the noise to come on - no noise this time - is this the same as the "watched pot"?).

Also, the noise is coming from somewhere above where the blower is as we've gone down to the basement and tried to trace the noise while it was running (and whining).

Is this weird???
 
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Old 12-03-02, 10:31 AM
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blower

With the power off. Reach in the blower on the other side from the motor and see if you can like lift the wheel of the blower up and down. Or like any play there? Any end play there like in and out on the motor. This way we should be able to tell if its in the motor bearings.Now you say it stops when the burner goes off you sure its not in the burner? When was the last time you did a gas pressure test with a manomete, on this LP setup. are you sure the vent holes are open all the way on the regulator by the home and on the tank ED
 
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Old 12-03-02, 11:00 AM
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damita:
Noises like this are sometimes difficult to trace, even for a pro.

This might be a good time to get your furnace checked by a qualified heating person.

A trick to sometimes locating noises like this is to use a longhandled screwdriver as a stethescope.
CAREFULLY place the pointy end against someting you want to check and then put the handle against your ear.
This will sometimes locate the source.

Again be carefull with this. Stay well away from the fan, flame and electricity.
 
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