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Repair and disassembly guides for microwave ovens.

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Making loud Hum when not on, but plugged in.

Samsung SMH2117S Microwave started making a loud hum a few days ago, I unplugged it over night and left it, plugged it back in the next day and still a loud hum, the hum stops when you open the door. As soon as you close the door, without pressing any buttons or starting the microwave the hum comes back. I took the microwave down from above the range, removed the cover to try and pin point where the noise is coming from. the hum is coming from the Magnetron. The unit will still heat food, and everything else seems to be working as normal. I don't really feel like it is safe to leave plugged in or even use. I have found a price on a new magnetron for this product for $115.(i live in canada) i have no problem buying a new one and replacing it. But i want to make sure that is the real problem.

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I took mine apart to find that the power supply was poorly epoxyied . When I powered it up the wingdings were vibrating within the transformer. I ended up Zip-Tie ing them together to reduce the noise and so-far-so-good.

I have the same problem with my Frigidaire FFMV164LSA. It makes a humming sound (sort of like a refrigerator running) when it’s plugged in. If I open the door the humming stops. It heats fine.

I have the same exact issue Ryan with the same exact model. Tried cleaning all the switches but it still happens. Would be great to know how to fix

I’m here with the exact same problem. Model ME18H704SFS

Mine is exactly the same model as yours. Joe fix worked! :)

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I had a Maytag microwave doing this. The unit was only 4-5 years old. After testing transformers and magnetron and other interior components I traced the problem to the lower door switch. I tightened the screws just inside the door because one was slightly loose. You could not tell this by opening and closing the door only by applying a screw driver to the screw. I tightened it and everything worked the way it should.

Hope this helps.

Joe

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Thanks! Worked for me and took 2 seconds to do for my samsung microwave. I tightened both screws where the latches engage, and it no longer hums now.

Wow. Thank You. Just, thank you.

My microwave is now making the HUM sound (same sound when I am heating the food and the plate is turning). My microwave brand is Frigidaire and I don’t have screws on door to tighten, what can it be? Joe. It makes that sound the lights on and only stops when open door.

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There is a safety switch (thermostat) that is often located just behind the user interface. If there is an issue with the thermostat or connection it can cause a hum in the motor of the fan motor. Give the safety switches a test for continuity. This was the issue with a humming Samsung microwave I just repaired.

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This is happening with my Samsung microwave it's just started happening an it only a few years old it's in a house I rent. Should I call the landlord? Yes now that You mentioned it the door seems a little loose

This sounds like my problem. When door is closed it sounds like a fan is running near top right of microwave. I will try to figure out how to disassemble the front control panel and locate that thermostat.

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There are three micro-switches on the latch board. When the door is shut, two of them should be closed and one should be open. If the third one fails and remains closed, it creates an unintended circuit loop that causes hum, although not necessarily operation at full power. I replaced all three switches (since the unit had to be opened up anyway) and the problem appears to have been solved. It may be intermittent however, as it did occur once in the past and went away on its own. The current assumption is that it the switch was still the culprit and replacing it should make a lasting repair.

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mine sounds like that and blow the fuss, i buy another and blow it again, dont know what to do.

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If your microwave is blowing your fuse you want to look at your door switches or inspect if something is grounding out in your high voltage circuit. (HV transformer, HV capacitor, or magnetron) . Remember that a fuse gets blown because too much amperage is pulled through the unit. If nothing is grounding out and your door switches test okay, try opening up the microswitches to see if there is any damage inside them. It's possible for a micro switch to allow continuity but still be damaged and cause the unit to fail.

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I figured out my samsung's power transformer was coming unglued in terms of the steel laminations. I wrapped zip ties around the laminations to keep them from vibrating. Now it is all fixed.

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I had the same problem, I tested all door switches. They were all fine. I tested the power relay on the main board and found it stuck on closed shorting the power to the transformer. Relay is available for $6. But I rewired a car relay and problem solved.

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