Pilot lights, flame starts, then burns out

Discussion in 'UK Home Improvement' started by wrlee, Feb 21, 2011.

  1. wrlee

    wrlee Guest

    In trying to get our natural gas fireplace to redraft, I\'ve gotten the
    pilot to light. Then the fire starts.
    After about 2-3 minutes the pilot burns out, which of course shuts the gas
    valves and the main
    flames eventually burn out. What could be causing the pilot to burn out?

    We have a thermocouple/thermopile based natural gas system. Since I\'m
    able to start the pilot and
    fire, I assume the electrical circuits/switches are fine.

    -------------------------------------
    wrlee, Feb 21, 2011
    #1
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  2. In article <e948b$4d62d099$45499b77$>,
    (wrlee) writes:
    >
    > In trying to get our natural gas fireplace to redraft, I\'ve gotten the
    > pilot to light. Then the fire starts.
    > After about 2-3 minutes the pilot burns out, which of course shuts the gas
    > valves and the main
    > flames eventually burn out. What could be causing the pilot to burn out?
    >
    > We have a thermocouple/thermopile based natural gas system. Since I\'m
    > able to start the pilot and
    > fire, I assume the electrical circuits/switches are fine.


    Could do with more info, but a few possibilities:

    Resistance in gas supply flow, causing a pressure drop when main burners
    come on, pilot shrinks, and no longer heats the thermocouple. Make sure
    any gas cock is fully on.

    Pilot jet part blocked or pilot air intake part blocked, so the draft
    caused by the main burners knocks the pilot flame off the thermocouple.

    If the fire has an oxygen depletion sensor, that might be operating if
    either it's faulty, or the air intake is low on oxygen for some reason,
    such as the fire's fumes coming out into the room and re-entering the
    air intake.

    --
    Andrew Gabriel
    [email address is not usable -- followup in the newsgroup]
    Andrew Gabriel, Feb 22, 2011
    #2
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