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Smell Coming From Intertherm Furnace

This started yesterday. When the furnace comes on there is a ''fumes'' like smell going throughout the entire house. Any idea what could be causing this?

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It could be several things.

The most alarming being a cracked heat exchanger allowing the exhaust fumes to enter the living space.

Exhaust fumes that contain carbon monoxide.

I HIGHLY RECCOMEND that you purchase carbon monoxide detectors, and/or check the batteries in any you might already have.

Carbon monoxide can be deadly at high concentrations.

It could be burning wires, but would smell like burnt rubber.

It could be mold/mildew but would smell musty like dirty socks.

It could be a build up of dust oil etc on the heat exchanger, but that is usually only smelled when it is started up for the first time in months.

Make sure the filters are clean. Dirty filters can cause overheating of the heat exchanger and sometimes cause smells.

This is one of those times I will recommend you have a professional look at your unit.
Specifically the heat exchanger to look for cracks.

A pro will know where to look, where the usual stress points are etc.

Posted on Dec 10, 2008

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