Gas valve vacuum

Old 09-21-04, 06:33 PM
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Gas valve vacuum

What is the purpose of the vacuum line to the gas valve?

I have 4 year old Comfortmaker 100K Btu high eff furnace. It will not light with the vacuum line attached to the valve. If it is taken off it will run and shut down. I would guess it is some kind of safety switch so I have not run it.

Any ideas of what would cause this?

Old 09-24-04, 03:50 PM
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Join Date: Aug 2001
Location: NW atlanta
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that is usually a proving switch for the valve to know the inducer is running

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