oven takes forever to heat up

Discussion in 'Home Repair' started by Heathcliff, Nov 17, 2009.

  1. Heathcliff

    Heathcliff Guest

    I have a Kenmore gas oven, about 10 years old. Usually, but not
    always, it takes a loooong time to reach the set oven temperature -
    like 30 min. to get to 350. My wife thinks she can "fool it" by
    putting in on broil first, then switching over to bake. She may even
    be right. It seems to able to reach and maintain any temperature, it
    just takes a long time. Appreciate any ideas on how to diagnose/fix
    it. Thanks, -- H
     
    Heathcliff, Nov 17, 2009
    #1
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  2. Heathcliff

    mm Guest

    On Tue, 17 Nov 2009 11:01:40 -0800 (PST), Heathcliff
    <> wrote:

    >I have a Kenmore gas oven, about 10 years old. Usually, but not
    >always, it takes a loooong time to reach the set oven temperature -
    >like 30 min. to get to 350. My wife thinks she can "fool it" by
    >putting in on broil first, then switching over to bake. She may even
    >be right. It seems to able to reach and maintain any temperature, it
    >just takes a long time. Appreciate any ideas on how to diagnose/fix
    >it. Thanks, -- H


    When you look at the flame, is flame coming from every port along the
    whole thing?

    If one hole is clogged with dirt, the flame won't spread beyond that
    whole, which might disable a whole big section of burner.

    Otherwise, if you see as many flames as you should and they are as big
    and the right color that they should be (yellow tipped with blue, I
    think, or maybe mostly blue. I don't know.), you must be getting
    enough heat, so if you're not, the flames must be wrong.

    There is an adjustment for air, but I don't think it ever needs
    resetting. I wouldn't touch it. I think the only thing that ever
    needs to be done is cleaning.

    A lot of people don't seem to realize that with gas ovens and stoves,
    each whole burner comes out for cleaning. The gas comes in at one
    end, and the cast iron burner rests on something at the other end.
    After you've checked out the flame, lift the front end it a little,
    pull a little, and the whole thing comes out. Clean each hole with a
    toothpick, eespecially holes near the border between working and not
    working. And maybe after that a brush, though I'm not that picky and
    I only use the toothpick.

    This is why gas stoves can last forever.
     
    mm, Nov 17, 2009
    #2
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  3. Heathcliff

    Jules Guest

    On Tue, 17 Nov 2009 14:46:52 -0500, mm wrote:
    > This is why gas stoves can last forever.


    Kind-of :) I had some friends with one from the 1920s - it was still
    running more-or-less, but a lot of the cast metal parts were so corroded*
    that it was a bit of a pig to light the thing, and spares were (obviously)
    unobtainable and had been for decades. In the end I think it had to come
    out because they couldn't get insurance on the property because of it.

    * I'm not sure if that was just from moisture - doesn't unlit gas cause
    inherent corrosion problems? Maybe I'm misremembering there, though.

    cheers

    Jules
     
    Jules, Nov 17, 2009
    #3
  4. Heathcliff

    Mikepier Guest

    On Nov 17, 2:01 pm, Heathcliff <> wrote:
    > I have a Kenmore gas oven, about 10 years old.  Usually, but not
    > always, it takes a loooong time to reach the set oven temperature -
    > like 30 min. to get to 350.  My wife thinks she can "fool it" by
    > putting in on broil first, then switching over to bake.  She may even
    > be right.  It seems to able to reach and maintain any temperature, it
    > just takes a long time.  Appreciate any ideas on how to diagnose/fix
    > it.  Thanks,  -- H


    The ignitor could be the culprit. If it's defective, it will glow red,
    but it will not generate enough current to turn on the gas valve for
    the oven, or it might shut the gas off too soon.
    A good indicator its the ignitor is when you turn the oven on, it
    takes a while before the ignitor glows red.
     
    Mikepier, Nov 17, 2009
    #4
  5. Heathcliff

    Heathcliff Guest

    On Nov 17, 5:52 pm, Mikepier <> wrote:
    > On Nov 17, 2:01 pm, Heathcliff <> wrote:
    >
    > > I have a Kenmore gasoven, about 10 years old.  Usually, but not
    > > always, ittakesa loooong time to reach the setoventemperature -
    > > like 30 min. to get to 350.  My wife thinks she can "fool it" by
    > > putting in on broil first, then switching over to bake.  She may even
    > > be right.  It seems to able to reach and maintain any temperature, it
    > > justtakesa long time.  Appreciate any ideas on how to diagnose/fix
    > > it.  Thanks,  -- H

    >
    > The ignitor could be the culprit. If it's defective, it will glow red,
    > but it will not generate enough current to turn on the gas valve for
    > theoven, or it might shut the gas off too soon.
    > A good indicator its the ignitor is when you turn theovenon, ittakesa while before the ignitor glows red.


    This morning I took off the oven bottom plate so I could observe the
    burner. When I turned the oven on, the ignitor worked fine, and the
    burner worked fine (no clogs) but the gas supply was weird. The
    flame came on full blast for just a few seconds, then went to a
    minimal level for half a minute or so, then repeated that cycle a
    couple times. Then, it went into an even weirder mode where where the
    flame level was oscillating between low and medium, making a ft-ft-ft
    sound. So, I can see why it is so slow to heat up - the flame does
    not stay at a high level. But, why does that happen? -- H
     
    Heathcliff, Nov 21, 2009
    #5
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