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Jotul 3 Classic NG Problem

Post in 'It's a Gas!' started by 8arlie8, Sep 11, 2009.

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  1. 8arlie8

    8arlie8 New Member

    Joined:
    Sep 11, 2009
    Messages:
    1
    Loc:
    Maine
    I have a Jotul 3 Classic gas (NG) B vent stove. It's about 10 years old. During the last season it started burning very rich and sooty with crud building up below in the burn chamber. I'd clean it out, run it another month, and end up with more soot and crud. When I say crud, it was piled up right to the burn tube sometimes. So I first opened the air intake near the base of the burn tube to see if this would balance it. I then realized the burn tube itself was completely corroded and cracked, and with a lot of trouble from Jotul replaced it (it is the one piece "U" type tube and it cost almost $200). All this history brings me to the problem and the question....

    Now the stove lights but doesn't stay on. Furthermore, without any change to the gas pressure (which is normal) the stove is totally over fired when on with huge flames. Nothing has been touched on the stove valves and the new tube is OEM perfect. I have trimmed the gas pressure with the house gas line's valve so the flames are normal height, but the stove still kicks off after a few minutes. What is going on and did something happen when it was sooting heavily to burn out the stove's gas valve?

    I should mention that I have cleaned thermopile, thermocouple, and bypassed the spill switch (just to check it) and they all seem fine.

    Thanks for any help.

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  2. DAKSY

    DAKSY Patriot Guard Rider Staff Member

    Joined:
    Dec 2, 2008
    Messages:
    5,387
    Loc:
    Averill Park, NY, on Burden Lake II...
    1. Does the pilot also go out - or just the burner?
    2. Did you take a Millivolt (Mv) reading on the t-pile?
    You should get in the 550 +/- 50 range on the pilot...
    With the burner you should be about 250...
    If the Mvs drop to about 135 it'll shut the unit down...
    It may be on it's last legs...
    If so, replace it...
    Warm in Woolwich likes this.
  3. MountainStoveGuy

    MountainStoveGuy Minister of Fire

    Joined:
    Jan 23, 2006
    Messages:
    3,654
    Loc:
    Boulder County
    Is the vent cap clear of obstructions? Very strange that its overfiring, the manifold pressure might need to be checked. Check to make sure the orfice is still seated on the feed tube, or the feed tube is not cracked. Do all the things Dak asked and report back?
  4. jenny

    jenny New Member

    Joined:
    Mar 19, 2010
    Messages:
    4
    Loc:
    canada
    I know this thread was posted a long time ago but I wonder if you ever found out what was causing the problem. I bought an old Jotul, Classic DVNG D31719 that had never been used. When I turn the flame up, after a couple of minutes theres a click and the pilot light goes out.
    Has anybody got a manual or installation guide? Wonder if it was installed right.
  5. Wood Heat Stoves

    Wood Heat Stoves Minister of Fire

    Joined:
    Jun 12, 2009
    Messages:
    1,901
    Loc:
    Nevada City, California
    is the unit spilling exhaust?? smoke(insense stick etc) near hood should get sucked up chimney...
    if so the spill switch/ and or venting sounds like the culprit
    bypass it for testing only!

    i have generic troubleshooting info avail, does your unit use robertshaw or nova sit valve?
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