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I am working on an older Williams gas wall heater. Pilot lights, heater comes on- after 1 hour cycles off, kills pilot light. one year ago installed new gas regtulator. DJWilson djwilson10@juno.com

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  • djwilson10 Dec 07, 2008

    I replaced thermopile prior to replacing regulator, also replaced thermostat at that time. that seemed to help at that time-but now back to same problem.

  • Ken Bledsoe May 11, 2010

    Have you ever replaced the thermopile? It is similar to thermocouple.

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You have some limit switches located around the unit one high one or two around the middle one of them is opening and not closing. You need to take off the cover and locate the limits undo the wires and ohm them out you should have complete circuit now the one that is open when you find it is bad and needs to be replaced with the same rated heat temperature as original. Your t-stat goes through these limits and one open would kill the whole circuit. Let me know how it goes. ken

Posted on Dec 07, 2008

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