On Mon, 19 Oct 2009 10:39:29 -0700, jamesgangnc wrote:
That pump is to pump out the water byproduct of the gas burning. On
older lower effeciency furnaces the water would go out as vapor. On
newer furnaces the exhaust temp is too low so the water condenses.
It's optional because some people have a drain nearby in the floor tha
the pipe can be routed to. Yours maybe has to pump up to a sink drain
or something like that?

Yeah, that's it. We've got no drain in the basement floor, and the main
pipe to the septic runs at about chest height along the basement wall. The
pump raises it about 8' though, where it taps into one of the drain lines
running from a sink.

Sounds like it's irrelevant to the OP's problem, then...

cheers

Jules