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Thread: LSWS305ST LG Wall oven Thermostat AND thermal fuse

  1. #1
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    Default LSWS305ST LG Wall oven Thermostat AND thermal fuse

    Model Number: LSWS305ST
    Brand: LG
    Age: 6-10 years

    Hello, I am in need of help.

    My LG wall oven blew a thermal fuse a few years ago after a self clean. I did not use the self clean cycle again.

    Since then, the thermal fuse has blown 2 more times, and the thermostat (another fuse type one on the back of the unit) has failed twice. I have had to take my oven out of the wall 4 times. This is getting frustrating to say the least.

    One thing i notice is that each fuse I remove has melted plastic near the leads (the metal tabs that you connect the wires to). This does not look like it melted from external heat (the rest of the plastic on the fuse is fine). I will post a photo.

    Is there something else that could be causing these repeated failures? How would I go about diagnosing this?

    HELP. I am sick of pulling the oven out. Yesterday it happened when i tried to use the oven on convection bake at 450 degrees.

    Click image for larger version. 

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  2. #2
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    Take the wire that was on the melted t-stat terminal and cut the wire end off. Strip the wire back about an inch and check the wire strands. If they are not shiny and look dull that's probably causing the problem. Make sure all the wire connectors are on tight. Even though the other end is not melted that wire can be bad also. Check the wires on any part you've replaced. If there's a gap between the wire insulation and the wire end it's a good indication the wire is breaking down.
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  3. #3
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    Okay, so I can do that. But i have one question. As i mentioned in my post, there are 2 separate thermal fuses in this oven. BOTH of the fuses have melted like this. It seems unlikely to be a wire issue, because it would have to affect 2 different wires on 2 different parts. Does that kind of thing happen?

    Could this be something with one of the circuit boards?

    Also, I installed the oven in a cabinet with ample room behind the oven (4" more than spec), but it does not get any air flow back there. Could this be a problem? There is nothing in the installation manual about air inside the cabinet, and the oven has an intake and a vent on the front. I do notice, however, that there are air vents on the back of the oven cabinet.

    Thanks.

  4. #4
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    The 4" is fine. The main problem is it's an LG. I've replaced a lot of those TCO's on LG ovens and ranges more than any other brand.
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  5. #5
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    Quote Originally Posted by rickgburton View Post
    The 4" is fine. The main problem is it's an LG. I've replaced a lot of those TCO's on LG ovens and ranges more than any other brand.
    So would it be feasible to replace the wiring, or would that be a job too big to try?

  6. #6
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    You don't need to replace the entire wiring harness (a big job). Just cut off the bad wire, about an inch or two, and replace the wire terminal/end.
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  7. #7
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    Sorry for so many questions, but i have one more.

    In my original post, you can see that I have had to replace both of the thermal fuses in this oven. So i likely have more than 1 bad wire...

    Does this change your thoughts on the problem at all?

    thanks.

  8. #8
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    Maybe four bad wires. I made you a diagram:
    Click image for larger version. 

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