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-   -   14 below zero here and my furnace exhaust is frosting up (

wease 02-03-2007 11:31 AM

14 below zero here and my furnace exhaust is frosting up
It vents through a chimney duct to the roof and the frost around the pipe is very large where it exits at the chimney. Should I be worried?

rakes9720 02-03-2007 11:42 AM

Is it a 90% efficient furnace?

wease 02-03-2007 12:18 PM

I believe so. It's a sealed combustion unit.

rakes9720 02-06-2007 08:27 AM

If the ice covers/blocks the vent pipe, it will prevent the pressure switch from making, and you will see the associated diagnostic code in the furnace. If it does this, then you have to clear the ice. It could possibly cause other problems if it gets blocked, but you don't have to clear it unless it causes a problem.

wease 02-06-2007 09:48 AM

Thanks. I just don't want any exhaust in my home.

rakes9720 02-06-2007 02:10 PM

The safety switches in the furnace will prevent this.

redline 02-06-2007 03:24 PM

Is the "chimney" made of bricks or metal pipe?

wease 02-06-2007 03:55 PM

Chimney is all stone with pvc coming up.

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