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
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 ....
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!!!!!!!
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