I have a 23 year old Carrier nat gas furnace, model 58GP125. Last spring
and now in the early fall I noticed
a strong 'hot metal' smell coming from the furnace when it is on. After a
few heat cycles the CO detector
in the house goes off. So I think that the flue is blocked and it's not
venting properly, but it couldn't be any
cleaner. Nothing but some light rust dust in the vent pipes. The furnace
otherwise runs fine. No weird
noises, burners have a nice blue flame, fan runs fine, new air filter.
Good air flow at the registers.
I'm stumped. I haven't taken the furnace apart to fully inspect the heat
Years ago, there was a product sold at the supply house that when
sprayed into the return air of the furnace would cause the burner
flames to change color if there was a leak. I haven't seen it at
or noticed it at the supply house lately. I could check when I go by
today and see if it's still available. Here's a link to some information
that may help you find a possible heat exchanger leak.
ain't no "stumped" to it, you have a problem with a jurrasic furnace that is
most probably terminal(cracked or compromised heat exchanger). Your furnace
past the upper end of usable service life. They don't last forever. Bite the
bullet and have a new one installed. A new 2 stage, variable speed furnace
will most probably pay for itself in just a couple of years in energy
savings alone. Yes furnaces are more expensive now than what they were 23
years ago, but then so is everything else.
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