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My kenwood microwave model KCTAL30 is buzzing when power is switched on and door is shut ,when door opened buzzing stops but turntable is rotating.

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I was having the same problem. Out of warranty for a month or so hence no-one wanted to know. Nothing to lose then. It had to be a door switch I thought and so removed cover. The bottom switch showed continuity (door open or closed). Removed the switch to reallign the contacts inside (the switch is open on one side so the cantacts can be seen. That did the trick and it now works again.

Posted on Jul 28, 2011

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RE: Samsung microwave SMH7187STG mfg'd 5/08. I heated cup of tea 2 min.Then I closed micro's door & micro emitted a continuous electrical buzzing sound.I opened door & buzzing stopped.


The cook relay on your control board is shorted, and the unit is cooking whenever you close the door.

When the magnetron overheats, its thermostat opens, shutting power down until the unit cools to a safe level, then power is restored.

I regularly repair these with my $54.95 service, which includes insured return shipping.

Details are here, or for full information and instructions, please e-mail me here at pupista@gmail.com and remind me of your full model number and symptoms.

Dec 20, 2016 | Samsung Microwave Ovens

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When I shut door, the light stays on and it


I would suspect that the door sensing switch (top door switch) is open inside or is disconnected. This will cause it to seem like the door is open, but it will not cook.

It may also have an intermittently bad secondary interlock switch (bottom switch). If this were the case, it would not microwave or cook in convection mode, but the turntable would fail to operate, too.

We have the applicable service manuals for this models and have uploaded them to our site here and here to help you.

If you only need a switch, you can order a universal type here for $5 postpaid.

If you need other parts, you can order them by the part number in the service manual from this supplier.


We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

May 13, 2010 | Dacor DCM24 Convection/Microwave Oven

1 Answer

Odd buzzing after timer stopped, food was still being heated


Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

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Aug 20, 2009 | Whirlpool MH1150XM Convection/Microwave...

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I have a Whirlpool AMW545 built in microwave oven. The turntable continuosly runs with the door shut when the microwave is not in use. The turntable will stop rotating if the door is opened.


the controller for the turntable is shorted out or welded its contact if its a relay. the door has safety switches that turns off the electrical connection to the turntable and magnetron once you open the door. you can trace the switch that runs the turntable. start from the power supply, goes to the door switch then to the controller before it goes to the turntable motor. i'm sure it has an electrical diagram at the inner wall of the cover.
i hope i was able to help.

Jun 27, 2008 | Whirlpool Microwave Ovens

1 Answer

Microwave Oven Problem


Quite often this is due to a bad door switch. Opening the door while cooking (without first hitting the STOP pad) is the primary cause of door switch failure. It's probably not actually heating with the door open, but better safe than sorry! If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info (as well as a text file which helps in diagnosing and repairing door switch problems) at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk You can find helpful exploded view diagrams and order parts by entering your full model number (without the suffix) here: http://tinyurl.com/gv383

Apr 10, 2007 | GE JEM25 Microwave Oven

1 Answer

Microwave works with door open


If the top is open, the upper door switch should be open and the high voltage section should not be energized. That's the way it's *supposed* to work. But that buzzing is worrysome! Does the turntable turn during this condition? Does the inside light come on? How about the fan? If not, then I would doubt that it's cooking. If so, some models will do this. It's not uncommon to notice that the fan and light will try to come on for a split second when you shut the door. This would not indicate a problem. It has to do with the timing of the door switches and a replay on the board. If it's still under full warranty, it wouldn't hurt to call a GE-authorized servicer.

Nov 07, 2006 | LG LRMM1430 Microwave Oven

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Smasung MW7490w door/turntable problem


It's probably a defective door switch, probably the upper one, or the mount which holds the switch is broken. Opening the door while cooking (without first hitting the STOP button) is the primary cause of door switch failure. There are plastic mounts inside the microwave which hold the door switches and onto which the door hooks latch when you close the door. The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly. Usually it's not a loose screw, but instead a broken tab on the switch holder, allowing the switch to rotate just out of position.

Sep 23, 2006 | Samsung SMH7159 Microwave Oven

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