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Posted by geothermaljones on January 10, 2008, 7:59 pm
Your problem was restricted flow through the heat exchanger...
Fairly common if the system is filled with unconditioned water.
It results in crud build up, slowing flow & causing the water to boil &
flash to steam...
It does sound like a skeet range.
Glad you got it figured out.
good luck
geothermaljones
st.paul,mn
> I have a Munchkin 199M Boiler that started acting up recently. When
> the boiler goes to light, it sonds like some one shooting skeet in my
> basement. The first time this happened when I was standing next to the
> boiler, I nearly jumped out of my skin. I think this backfiring also
> caused the demise of the plastic induction fan impeller, which
> fortunately still had 3 months left on the warranty, so I have the new
> aluminum fan now installed. However, the detonation problem still
> exists and the Service Techs and myself are stumped as to the cause.
> Has anyone heard of this happeneng and know the cause? I've found
> references to this in other posts on the net, but no one has yet
> posted a definitive answer. Help!
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