#-59 - How to Test Microwave Door Switches

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Does your microwave give you an “open and close door” error? Does your microwave count down without cooking? Does the turntable turn when the door is opened? How to tell if a microwave door switch is bad. Four most common ways that microwave door switches fail and how to test them. #testdoorswitch, #microwavedoorswitch, #microwaveswitches, #microwavecountsdown
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This video is intended for experienced or supervised technicians. Always take appropriate safety precautions when dealing with live circuits. For informational purposes only. Utilize the concepts in this video at your own risk.
The Tech Circuit or Steve Morrison assumes no responsibility or liability for any errors or emissions in the content of this video. The information contained in this video is provided on an as is basis with no guarantees of completeness, accuracy, usefulness, or timeliness.

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29 сен 2024

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Комментарии : 24

@saifulsarker2539 14 дней назад

Just wondering how a faulty door switch can cause the fuse to blow on a microwave oven. My Frigidaire oven fuse blown twice and I am going to check the door switch.

@sernani99 2 месяца назад

Good info, I'm not the most handy with electrical components, I believe I need the door switch replaced, but I don't know if I need the normally open or close. When I start my microwave, it trips my circuit breaker. Can you please tell me which one I need, please? Thank you.

@artriumph 2 месяца назад

I have a GE microwave that powers on, the timer counts down, and turntable turns. However it doesn’t heat up. Could the problem be one of the door switches? I’d appreciate any help. Thank you very much.

@TheTechCircuit 2 месяца назад

If you don't hear it running, then it is likely a door switch. If it is going through all of the motions, it is likely the magnetron. In that case, I like to do current draw testing per this video: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-fqb_ib7Hslo.html

@unamor 2 месяца назад

What if the fan and turntable work, but the countdown won't move and food won't heat? Thanks for this great video

@TheTechCircuit 2 месяца назад

That sounds like a stuck relay on the board.

@unamor 2 месяца назад

@@TheTechCircuit Thanks a lot for your answer! Do you know of any resource on YT or else where I can learn to test and eventually replace these? Thanks again

@TheTechCircuit 2 месяца назад

@@unamor If you mean the relay - if shorted, it will read about 0 ohms from terminal to terminal (on top). However, replacing the relay can void the CE and UL certification of the board and I can't officially recommend doing that. Generally speaking, the generally acceptable method to resolve the issue of a fused relay is to replace the boards.

@jonnelson6448 5 месяцев назад

This is a very helpful video, thanks. Two questions: 1) Do you have a suggested source for buying new switches? 2) Is the problem sometimes a mechanical problem with the latch mechanism? About 2), we've had the problem that the microwave turntable and heating turn on only if we tug slightly outward on the door. A few months back, I did check the electrical function of the switches, finding them fine, but I've not heard of anyone having to pull on the door to get the microwave to heat. (No error message, and the countdown display turns on and runs--it is just the turntable and heater that require pulling on the door.)

@jefferson2310 4 месяца назад

Not all door switchs click, some two prong side by side on panasonic nn cf microwaves don't make clicking noise, use of multimeter you will still hear the beep for on and off.

@StockDude 7 месяцев назад

great video, thank you.....but my microwave is 27 years old and can't even get parts for it anymore! lol An Emerson MW-8775S/D If you know where I can get some door switches, which is what I suspect wrong without checking it, then please let me know. Manufacture date June 1996. It still heats great.

@paul.alarner6410 5 месяцев назад

should a switch measure 3.5 ohms when closed?,if not does that point to it being bad?.

@TheTechCircuit 5 месяцев назад

If you touch your multimeter leads together and the meter reads almost 0 ohms then yes. If it reads close to 3.5 ohms, the resistance is in the meter leads or connections rather than in the switch.

@alanross3435 6 месяцев назад

New sub here…you nailed it showing the discoloration on the switch leads! New switch should be here tomorrow! We almost ordered a new one @ 160.$ out LG is only 10 years old! Thank you very much!👍🏻☮✌🏻

@trinityappliancerepair1344 Год назад

Great video

@TheTechCircuit Год назад

Thanks!

@CeceMA05 4 месяца назад

Very informative and detail! Thank you!

@robertburgess8981 9 месяцев назад

Great video! Will a heat stressed switch show an odd ohm reading?

@TheTechCircuit 9 месяцев назад

Often times, it will.

@robertburgess8981 9 месяцев назад

Thank you! We are trying to diagnose a problem on a Frigidaire microwave the switches don't seem to be getting made when you close the door. Sometimes slamming it worked but not anymore. All three switches tested good but one did seem to show some Blackness around the connections.