Gas station without pumps

2020 November 11

Oven fixed

Filed under: Uncategorized — gasstationwithoutpumps @ 19:33
Tags: , ,

Our gas oven (LG brand model LRG3093SW) stopped working last week, just as I was about to heat a plate of nachos. I suspected that the problem was that the oven igniter had failed, for three reasons:

I first went through the trouble-shooting instructions in the manual, which are a very short list of things to check (like whether the stove is plugged in and the gas turned on), ending with calling a professional.  Under “Oven Control beeps and displays any F code error”  subpart “You have ‘F11′” (the code it displayed), it suggests checking the oven gas shutoff valve (and cross-references “Surface burners light but oven burner does not”).

I did not bother checking anything this time—I just ordered the cheapest igniter I could find that looked ok and claimed to be compatible (it was a tossup between Walmart and Amazon, and I went with the one on Amazon).  I went with a cheap one, because even the mid-priced one I ordered last time only lasted a little over three years. I could buy one of the cheap ones every nine months and still come out ahead. I ordered on November 4 and the part arrived on November 9.  Today (November 11) was the first day I felt I had time to deal with it.

I had to look at a RepairClinic video to remember how to take the door off, but after that things went quickly: I disassembled the oven (taking off the door, removing the bottom plate of the oven, removing the heat diffuser over the burner) and turned off the power to the stove at the outdoor breaker box (having remembered this time that there was no indoor breaker for the stove or the laundry room). Turning off the breaker was easier this time than last, as there was no paint seal to break.

I pulled out the old igniter and plugged in the new one. Just to reassure myself that my diagnosis was right, I tested the old one for continuity with an ohmmeter—the igniter was definitely broken, showing an open circuit.

While I had the oven partially disassembled, I vacuumed out the oven cavity and cleaned the bottom edge of the door.  It seems that there are three screws missing from the bottom edge of the door—I wonder what size they were originally and whether they are worth replacing.

I had no trouble this time reassembling the oven and getting the door back on.  I didn’t even have look anything up on the web.

The whole repair took about half an hour—much less than last time!  The differences were the following:

  • I knew what I was doing.
  • The breaker box wasn’t painted shut.
  • The screws holding the igniter were properly installed, so easy to remove.
  • I didn’t drop and lose any of the screws.

It looks like I’ll be able to bake bread for Friday this week—I wonder what recipe I should use.

8 Comments »

  1. Glad that went well.
    My instinct is opposite,
    I always try to buy the best part to longer avoid crawling around .
    Crawling around is even harder now as I approach 70 and hurts later.
    Although, I feel good too when it does go well, no question.
    Holly wanted me to call a plumber this week to help me,
    but I had a few hundred in outflow that was unexpected, so this was my chance to
    balance out that cash outflow.
    We have been ignoring the failing bath faucet, and I went for it this week.
    went well, I still had the custom tools I built last time
    which was just 3 years ago, when we did this….Home Depot had good stock this time,
    several units that would have worked great and are better and serviceable.
    Was able to get a better one this time.
    And so chromey!
    The box made a big deal about the finish and it is nice.
    My back hates me a bit, but it’s a standard we all aspire to–like that Dave Chappelle
    routine where (being black) he jokes about that terrible time when your black kid
    first time does a sleep over at a white friend’s house.
    Sunday morning, he says,
    up your game! Everything at Timmy’s house works!
    Anyway, thumbs up Kevin
    Rick

    Comment by richard rebman — 2020 November 15 @ 18:23 | Reply

    • The original igniter failed after a short time (still in warranty, I think). The replacement one by the appliance-repair guy failed in about the same amount of time. The replacement one I got at mid-price failed after about the same amount of time. I see no correlation between the price of the part and lifetime for gas igniters. I think that they all fail after about the same amount of time in the flames, so there is no point to getting a pricy one.

      Comment by gasstationwithoutpumps — 2020 November 15 @ 18:27 | Reply

      • My curiousity would be why?
        Must be a reason they all fail consistently …..I doubt that its wear and tear.
        I used to service commercial style stoves, and sometimes had repeat issues like that.
        I think there was sometimes a valve adjustment issue, and there was a clearance issue…..Mark Furnahauld, the old owner from appliance service center,
        he used to check gap clearances with nickels or dimes, depending on the product.
        It really helped stuff run right.
        Sadly that company is gone.
        but a lot of the guys went over to Box appliance Service, where they get well treated and well enough paid I hear.
        Maybe one of those guys would have an idea why…or the people at Appliance Parts over on Soquel, Some of their counter
        folks used to work in the trade or be dispatchers , know appliance issues well sometimes and can help often.
        also, they keep a nice boneyard of old units out back for parts salvage.
        If you ever need it I highly recommend those guys for parts and support.
        Rick

        Comment by richard rebman — 2020 November 16 @ 18:34 | Reply

        • I don’t know why the igniters always fail. My guess is that the thermal cycling (from both the electric current and being in the gas flame then cooling to room temperature) induces tiny cracks in the ceramic. These cracks result in concentrating the current to go around the cracks, resulting in still more thermal stress from uneven heating. Eventually some part of the igniter overheats and fails.

          If my conjecture is right, better quality control on making the ceramic could result in somewhat longer lifetime for the igniters, but they are still likely to fail eventually.

          Comment by gasstationwithoutpumps — 2020 November 17 @ 14:49 | Reply

  2. this is not typical.
    Yet that is likely a good description of how they fail over time….I bet there is a thermal-couple in the circuit somewhere, maybe firing too often? weak, or bent? or coated?
    In my experience, such issues were generated by maintenance folks over-cleaning stoves and plugging or coating stuff with cleaners, catching rags on thermal-couple sensor loops and bending them, or bending the igniter lead.
    If the thing is firing too often on an ignition cycle or if the valve over-feeds, like if it was jetted for propane for example…(flame color would also tell you that one)…..similar symptom to that…..
    overall I am betting there is a manageable cause for consistent repeat of that event.
    I would go online or make a call and ask, often those counter guys know the dirty details like that. Like a guy who works on english cars, good ones know special info….it can be a fun puzzle– once it’s solved, unlike the english car example
    which is never really solvable…..LG is usually good stuff. I think they still make most appliances in the world, many of the brands of appliances, like kenmore, etc.
    Rick

    Comment by richard rebman — 2020 November 19 @ 09:28 | Reply

    • No thermocouple—the gas igniter just sits in the jet of natural gas and heats it to ignition temperature.
      https://findanyanswer.com/how-long-do-stove-igniters-last says that the average lifespan of a gas igniter is 3–5 years. Other web sites have about the same information. Supposedly newer ovens use spark ignition rather than the ceramic glow bar, and the spark igniters last longer.

      Comment by gasstationwithoutpumps — 2020 November 19 @ 09:42 | Reply

  3. interesting. must be a newer smarter one.
    I wonder how they control gas loss.
    I looked up their guidance and saw 2 things that caught my eye.
    First was,
    treat the thing like a halogen light bulb–any skin contact will contaminate and cause the igniter to fail .
    Second was,
    over door gasket leaks can cause issues also.
    I know I cannot claim innocence on the first one, it happens.

    Comment by richard rebman — 2020 November 20 @ 11:35 | Reply

  4. The bottom line is, their guidance on handling says you are right, the thing will fail over time predictably.
    My goodness, if exposure to finger oils creates hot spot/failure fractures the same way halogen bulbs do–
    it’s in the bottom of an oven. Stuff with grease and oils get baked and broiled in there.

    Comment by richard rebman — 2020 November 22 @ 14:03 | Reply


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