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-   -   furnace buzzing/humming? (http://www.houserepairtalk.com/f11/furnace-buzzing-humming-6742/)

Christian 05-27-2009 06:01 AM

furnace buzzing/humming?
 
Hello all,

I recently noticed my furnace making a buzzing/humming noise (similar to a 60 Hz noise hum...) all the time.

It does this even when off / not running. My fiancee says it's always done that, but I've never noticed it. It's loud enough that I can hear it upstairs (main floor) through the vents when the house is quiet.

Anyone know if it's normal and/or what it could be?

Thanks!

Christian

kok328 05-27-2009 06:05 AM

It could be a bad transformer or a contactor stuck closed.

Christian 05-27-2009 08:40 AM

Quote:

Originally Posted by kok328 (Post 30863)
It could be a bad transformer or a contactor stuck closed.

Any idea how to tell which?

Something I could fix myself?

kok328 05-27-2009 08:54 AM

You have to inspect the components I referred you to.
Once you ID the bad part and get it in stock, the replacement is only a few minutes of work.

Christian 05-27-2009 11:05 AM

Quote:

Originally Posted by kok328 (Post 30867)
You have to inspect the components I referred you to.
Once you ID the bad part and get it in stock, the replacement is only a few minutes of work.

So when looking at the components...how would I tell if it's bad or good??

I'm sure it varies between models, but can anyone help me to identify either of these components also?

Thanks.

kok328 05-27-2009 03:30 PM

If bad/going out; the transformer will be warm/hot and buzzing. If the contactor is bad; the contacts will be closed even though there is no power to the coil. Start by removing the panels from the unit and turn the power on (you might have to hold down the safety switch). Listen and/or feel for the buzzing noise and post back what you found and what it looks like.

Christian 05-28-2009 10:20 AM

I will pop the panel off and look in there tonight and let you know what I find.

Thanks for all the help!!

Christian 05-29-2009 10:42 AM

OK I took off the panel and listened/felt for the hum...it was very hard to pinpoint.

Here is a picture of what I'm working with:
http://i668.photobucket.com/albums/vv45/darga19/0529090615.jpg

If I touch anywhere on that silver "box" (that the circuit board is mounted to) or the circuit board, I can feel the hum. Also on either of the 2 other components mounted on the "box." It doesn't really stand out on one component more than another...and unfortunately I'm not sure what to look for.

Hopefully the picture could help you tell me what to look for / inspect?

Thanks!

kok328 05-29-2009 11:10 AM

Sorry, I can't see clear enough to tell what components are what.
Can you post a pic w/more light in the cabinet?

Christian 06-01-2009 05:52 AM

I'll try to take some better / lighter pictures tonight and post them.


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