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    Rick D's Avatar
    Rick D Posts: 2, Reputation: 1
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    #1

    Oct 20, 2009, 08:00 PM
    Furnace dropping voltage at gas valve
    I was checking voltage at the gas valve on a coleman furnace and my reading was 18 volts. What would cause the drop in voltage? I do have 24v into the board.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #2

    Oct 20, 2009, 08:23 PM

    Check the voltage ACROSS the gas valve relay contacts. It's probably between R and one of the gas valve terminals. In one case you should have 18 V and I'm expecting the 6 to be across the relay contacts indicating that the relay is bad.

    Any contact in series with the gas valve is suspect.
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