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  1. #1
    Join Date
    Mar 2020
    Location
    sf bay area
    Posts
    1
    Post Likes

    U41 - burner will not light

    Regency U41. 910-028 valve per part diagram. Robert Shaw valve.
    Pilot lights and holds solid flame. Yes - moved to "on".

    When turn on switch main burner does NOT light.
    TH - TH/TP when off is 330-335mv
    TH - TH/TP when on is unchanged. I would expect a drop to fire solenoid.

    Ohm-ing out switch leads...
    Switch when off : TH - TH/TP OL
    when on: 0 ohm

    But shorting switch terminals across valve also doesn't light main burner.
    that is th-th/tp
    Pile voltage seems low but puzzled why i don't see a drop across the thermopile when I turn switch on.

  2. #2
    Join Date
    Aug 2004
    Location
    S.E. Pa
    Posts
    7,282
    Post Likes
    We can't give DIY advice here. See Site Rules. You are testing incorrectly. None of what you posted makes sense. If you are a tech, get your post count up so you can post in the Pro forums where we can explain and give technical advice.
    Meanwhile, you need to review a technical manual on the RS valve.

    Could be spiders blocking the orifice .

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