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  • Imperial Oven Pilot Light

     fixbear updated 1 week, 6 days ago 3 Members · 7 Posts
  • johnshumway

    Member
    November 25, 2019 at 5:31 pm

    Have an imperial oven + range.  Oven pilot light will light and stay on just fine.  When I turn the oven on, once it gets up to temperature and the burner goes off, the pilot light goes off, too.  If I re-light the pilot light at that point everything works fine.  

    Turning the burner off right after it lights doesn’t affect the pilot light.  I think it has to get up to temp before the issue occurs.

    Any guidance?  

  • Olivero

    Member
    November 25, 2019 at 5:45 pm

    Sounds like a high limit problem.

  • fixbear

    Member
    November 25, 2019 at 6:14 pm

    Not having your model number prevents me from knowing what kind of controls you have.  Like maybe a standing pilot and hydraulic safety valve? If  tha gas supply is marginal, that can happen. Or it’s not a standing pilot.  Or the pilot flame is not making enough voltage to hold the safety open if a millivolt system. Or there is a noncombustible vapor getting to the pilot, like steam. 

    Let us know what we are working with.

  • fixbear

    Member
    November 25, 2019 at 6:37 pm

    I should clarify something here.  I and standing pilot system, pilot flame on the detection device, whether a millivolt generator  or a hydraulic valve has to be correct and impart the proper amount of heat to either make the pressure or the electricity .  If the mixture or intensity is wrong it will cause a trip as it should.  Hydraulics are especially critical to the right temp and often have special alloys built into the pilot hood as a catalysis to make the heat for the bulb to vaporize the metal in the bulb.  Often mercury. 

    With a Millivolt generator, one can make the flame to hot and prematurely destroy the generator.  It’s always best to place a digital volt meter on the generator and adjust the pilot to the 50 or 750 millivolts as required.  I’ve seen many of the 50 mv ones cooked over the years.  Now if your oven is tripping of the pilot, it may be that there is too much load for the generator when the main valve comes on.  Again, pilot flame off. (low or mixture)

    Hopefully this will tricker some thought. But let us know the model and I’m sure we can give you further.

  • johnshumway

    Member
    November 26, 2019 at 1:05 pm

    Looks like an Imperial IR-6.  I don’t believe it’s a marginal gas supply issue, at least, not at any point up to the oven itself.  The rest of the appliances are ok.

    I’m leaning toward a thermostat issue because it only happens when the oven gets up to temperature and probably a safety shut-off.  Doesn’t occur when the oven is still cold, burners are on, and I turn it off.

    • Olivero

      Member
      November 26, 2019 at 1:19 pm

      What’s the t-stat say compared to actual temp?

      Normally the pilot won’t go out if it just reaches temp, only in high limit safeties and flame sense loss.

  • fixbear

    Member
    November 26, 2019 at 2:14 pm

    Ok, they use a Teddington oven valve on that one. Becuase the millivolt generator has to have a extension to reach a valve all the way up on the top , you may want to check the coupling of that as well as that it is tight on the back of the valve. The first cycle makes a lot of expansion and it may be causing a bit of resistance. 

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