"boom" noise from furnace before blower kicks on


Old 10-09-05, 03:00 AM
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"boom" noise from furnace before blower kicks on

I turned on the furnace for the first time this past Friday and noticed that about 10 seconds before the blower comes on, there is a "boom" sound that comes from the attic just above the location of the furnace in the attic. Other than that noise, the everything seems to work properly. We get hot air from all the vents.

I plan on getting the furnace serviced in the near future, but this "boom" has me a bit concerned because I never heard it last year. We are new homeowners to this home and have only been living in it since February so we aren't sure if this noise is normal for the furnace when it first starts getting used.

By the way, we have a natural gas unit that is about 20 years old. I cannot really give you any more details than that.

Should I get the service guy in quickly or is this sound somewhat normal?

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Old 10-09-05, 09:03 AM
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I will suggest you get it serviced "clean and check" now. That boom could be delayed ignition caused by dirty burner crossovers and can be very dangerous.

Does it make this noise if you simply turn the fan to the "on" position?
Old 10-09-05, 10:10 AM
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CALL FOR SERVICE NOW!!!!!!!!!!!!!!!!!!!!!!!!

make your homeowners insurance is paid up.
Old 10-09-05, 10:20 AM
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With them all ,get a service guy to look at it .Sounds like after 20 years the burners should be cleaned. Also did you but a new filter in it. Dont forget to.

Old 10-09-05, 10:42 AM
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I agree with the other guys about getting the furnace professionally serviced. The noise could be something serious or something as simple as sheet metal expanding. In either case a pro can let you know.
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