Fireplace pilot light won't stay lit

jgdickjr Posted By jgdickjr, Jan 17, 2009 at 10:01 PM

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  1. jgdickjr

    jgdickjr
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    Jan 17, 2009
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    I'm looking for some input from an "experienced gas specialist!! I have a Majestic DVBR36 Direct Vent Fireplace about 2 years old with very low hours on it. It worked fine last year but over the summer I turned off the gas and thus the pilot light. NOw, the pilot light won't sray lit after I release the "pilot" button. The ignitor works fine and the flame envelops the thernocouple and thermopile fine I think. I even used a propane torch to add some extra heat but no joy so I have ruled out a flame problem. It uses a Honeywell Millivolt Hi-Low gas valve ((VS8420) with a remote wall switch (no thermostat) I checked the switch and it and the wires are OK. The thermopile (connected to terminals TH and TDTH) puts out 470 mv after 30 seconds and 750 mv after 1 minute. The thermocouple puts out 220 mv after 30 seconds and 350 mv after 1 minute. These seem Ok based on what I'v been able to gather from manual and the internet. I'm about ready to order a gas valve but am looking for confirmation from an expert. Help Please!!
     
  2. R&D Guy

    R&D Guy
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    Apr 25, 2007
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    Sounds like the valve to me. You might want to make a short jumper and jump the wall switch just to be sure. Also, try taping on the valve with the handle side of a screw driver. If it kicks on then you know its the valve although you'll still need to replace it as the problem will come back.
     
  3. trafick

    trafick
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    Dec 12, 2008
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    You said, "Now the pilot light won't stay lit after I release the "pilot" button". Well I'm certainly no expert but this sounds like the classic bad thermocouple problem to me.

    I would try that before I replaced the gas valve. Probably a lot less expensive.
     
  4. R&D Guy

    R&D Guy
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    Apr 25, 2007
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    That's what I thought at first, but it sounds like he has plenty of milli-volts. It's refreshing to see someone who knows how to check pilot voltage BTW.

    If I was more familiar with Honeywell I'd suggest doing a continuity check on the pilot coil, but I can't tell you what that should read. Perhaps others can help, but in the end it sounds like a sticky valve.

    The only reason suggested jumping the switch is in case the wiring is shorting some where. A continuity check won't show that.
     
  5. DAKSY

    DAKSY
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    <>The thermocouple puts out 220 mv after 30 seconds and 350 mv after 1 minute. These seem Ok based on what I'v been able to gather from manual and the internet. <>

    What!?!!? Your Thermocouple should read about 30 mv MAX..
    If you're getting 350 mv, there's something wrong with your t-couple or your meter...
    Most t-couples operate between 25-28 mv...
    Did you unscrew the threaded end out of the valve, put one multimeter probe on the small silver end & the other one on the copper sheathing to take your reading?
     
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