Question about LG Microwave Ovens

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If we close the mircowave door the units start to run by itself. - it will not heat, but the light comes on and the turntable rotates it will not stop until we turn the power off - when power is turned back on the mircowave starts again. LG - MS 1943 AL

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I think you have a welded controller, either a digital one or a mechanical one. microwave won't run unless you switch it to run. the door switches are safety switches to turn off the microwave once you open the door. if you have a digital controller, you could have a welded relay, if you have a mechanical timer, it could be a welded contact at the timer. another thing is that it should heat what ever you are heating. if it is not heating, check if it has a fuse and if it is busted. some fuse are installed to protect only the magnetron that is why the light and turn table are still running. if there is no fuse to the magnetron, then check the diode from the capacitor to the ground. it could be open. if not then you can have a bad magnetron. i hope i was able to help.

Posted on Jun 24, 2008

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Panasonic inverter microwave: when i shut off the lid, turntale automatically rotating


When you close the door the turntable comes on? Almost all have a safety switch in the side of the wall where the door closes, An inspection inside the unit will show if switch is damaged or out of position which could cause this problem.

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Mbbs 01 thermador micro oven: timer counts down, lights go on, but no heat, no fan and turntable does not turn. is it a fuse?


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Jun 16, 2012 | Thermador MBBS Microwave Oven

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The unit will count down, light will come on, the unit will not heat nor will the turn table run. I jumped out the door switch and the unit will run, however it powers downs.. and runs slow... Any ideas??


HELLO.

That the microwave will not heat solution.

1 Make sure the door is closed. If the door is not closed tight, the microwave will not function.Sometimes food will get stuck in the door and prevent the latch from working. Use the paper towel to get the food out, then close the door carefully and listen for the latch to click.

2 Check the power sources. First, make sure the microwave is plugged in; the plug may have shifted or slipped partway out of the socket. If it is plugged in and still does not work, voltage test the outlet the microwave is plugged into. If you are not getting a reading, the breaker is probably blown. Reset the breaker for that outlet in your home's circuit breaker box.

3 Reset the microwave breaker. Take the back cover of the microwave off with a screwdriver. Inside you will find a motor. Most microwave motors have a small red reset button on them. Hit that button. Your microwave should work again if the breaker was the issue.


That the microwave turntable will not run solution.


Needed equipments are:
  • Screwdriver
  • New belt
  • Continuity tester
  • Bearing lube
    • 1 Inspect the turntable base wheels and guides. If they are gummed up with food or
    • other gunk, they will not turn and the turntable will not rotate. Clean as needed.

    • 2 Remove the microwave case by unscrewing the casing screws with your screwdriver. Locate the turntable motor which will be directly beneath the oven floor.

    • 3 Inspect the belt that connects the motor to the rotating table. If the belt is broken, replace it.

    • 4 Touch the probes of a continuity tester to the electrical contacts on the motor. If the tester lights up, the motor windings are good, which means the motor is functional. If there is no light, the motor needs to be replaced.

    • 5 Check the wires leading from the cord to the motor itself. Look for any breaks in the wire, or a wire that has been pulled off of any electrical connection. Any connection that has been compromised can be soldered back into place, but if the cord is damaged at all, it needs to be replaced.

    • 6 Attempt to spin the motor by hand if the continuity is good and the belt is in place. It should spin freely, but if it is difficult or doesn't move at all, you will need to lubricate the bearing. Either apply spray or bearing lube to the motor axles to solve this problem, and allow the motor to spin freely once again.

    • THANKS.

Sep 20, 2011 | Microwave Ovens

1 Answer

Hi our Haier HMW31AEDS microwave has the following problems. 1. It starts itself as soon as we shut the door. 2. The keypad does not work. 3. The only way to turn it off is to manually pull open the door...


I am 90% sure the running as soon as the door is closed is a bad door switch. This could possible explain all the issues with the unit. I would check that first

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My Belling BEL-CJ/SS25 Microwave / oven / grill has recently developed a problem. Every time I close the door the turntable starts rotating, even when I'm not using it. It doesn't make a noise, and doesn't seem to be going into any cooking setting, and the light doesn't come on, but it turns until I open the door, when the light comes on and the turntable stops turning. This has only recently started happening, and nothing else seems to be wrong with it, Is this safe or should I get rid of it and buy a new one. The guarantee has expired so repair may be cost prohibitive.

Sep 04, 2009 | Microwave Ovens

1 Answer

Turns on by itself and turntable does not rotate


You may have a control board issue. Thank God for safety switches.
This is a problem that an integrated circuit tech. can repair, but it may be costly.
Decide how much you want to put into this oven vs. buying a new one.

Contact me once you decide and I can help you find a service center.

Thank you,

Dave E. (Illeagle)

May 30, 2008 | Sanyo EM-S8000 Microwave Oven

1 Answer

Mircowave oven stopped working


Generally, the most common causes of a failure to heat are:

- bad door switches or door switch mounts
- loose connection at the magnetron
- problem or loose conneciton on the control unit circuit board
- bad magnetron or other high voltage part

If you or a friend decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and
disassembly information at our site, linked here on Fixya: http://tinyurl.com/yzjozk

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