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  1. #1
    Join Date
    Jul 2002
    Location
    NorthEast
    Posts
    811

    A O Smith Water heater Pilot

    40 gallon gas with a vent motor FGR

    the thermocouple screws into a factory interrupt switch
    that connects to two limit switches on the top flue vent opening

    I have continuity through the wire and both limit swiches, but

    when i connect the limits back into the switch the pilot does not stay lit

    If I jump out the switch the PILOT will stay on

    Can it be a weak thermocouple that does not

    generate enough current to travel through the limits?

    The pressure swich is working and it energizes the vent motor when

    the burner lights

  2. #2
    Join Date
    Oct 2004
    Location
    PDX
    Posts
    4,917
    Check the voltage of the Thermocouple. If it is out of the acceptable range, its bad.

  3. #3
    Join Date
    Jul 2002
    Location
    NorthEast
    Posts
    811
    Should I check the Voltage at the terminals that are behind the
    control vave
    What is an acceptable milivolt reading for that valve

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