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Weil mcclain HE-2 Flame prove?

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Bowtieboy
Bowtieboy Member Posts: 1
in THE MAIN WALL
I have a weil mc cain HE-2 That  on a call for heat the pilot lights but the main burner does not open.  My question is "What proves the flame so that main gas opens.

Thanks

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  • icesailor
    icesailor Member Posts: 7,265
    edited February 2013
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    Proven:

    If the pilot lights, the flame rod senses irt and tells the brain to go to the next step. If the flame rod is OK, and the brain doesn't sense it, the brain doesn't open the gas valve. The flame rod is the first step in the train.

    The pilot is supposed to light. Is it a hot surface ignitor or a spark ignition or a standing pilot?
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