heat exchanger noise

10 year old Armstrong gas forced air furnace makes a muffled boom noise 10-15 seconds before blower turns off after a heating cycle. Service man states its the heat exchanger. Company will warranty the part but not cost to replace $200-$300 labor. Have been told its not a safety issue but an asthetic one. Any thoughts on this? Thanks in advance, Jim
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Hey, if you want a warranty heat exchanger installed for $300 so it looks pretty.........that's up to you. Just make sure you change the thermostat and wiring to make it run more efficient. Bubba
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My thoughts are "not likely"...
...it'd be a new one in the book if it were true.
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In the older days, heat exchangers might "oil can", but I haven't heard on doing that in many years. I'd bet it's something else. Check to see if the blower wheel is tight to the shaft. Or something ....
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Zyp
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the
Of coarse, his 10 year old furnace might ACTUALLY be 20+ years old.
Like the one I was told wasn't very old... less than 5 years.
Ended up being an old Brown, natural draft, Heil, with a pilot light!!!!!!! <grin>
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