Question about Whirlpool GH4155XP Microwave Oven

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Humming noise from control panel

When pluged in control panel hums

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This usually means that a micro switch is faulty, check the micro switch and replace if faulty, there should be two micro switches

Posted on May 17, 2014

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Posted on Jan 02, 2017

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A microwave in standby mode should not crackle. There might be a slight humming sound from a transformer, but that should be all the noise it makes. You could have a transformer or control panel component that is failing.

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My parents have had a couple of the spacemaker microwaves mounted over the range with the built-in vent. Over time, the seal on the control board gets a crack in it and the steam from cooking below it gets up into the control board and does it in.
Even if yours isn't mounted over the range, it sounds like a main control board failure.

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Our KitchenAid microwave works well, heats food, etc., but makes a constant loud and annoying humming noise (close in frequency and tone to the hum of cold fluorescent tubes) even when not in use. When...


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When the microwave is plugged in but not running there is a buzzing/humming noise.The unit works fine and the buzzing/humming continues when in operation as well.


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The transformer can be replaced by contacting the manufacturer and browsing for a dealer near you.
Hope that helps.

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1 Answer

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If all of your door switches check out, replace the magnatron, capacitor, and diodes.

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1 Answer

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Most likely a shorted capacitor is causing the fuse to blow. Easy and cheap to fix.
Check with www.martinmicrowave.com or call toll free 1-877-894-0035 for parts info

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1 Answer

Humming sound


In my professional opinion, it sounds like you have a shorted relay or other defective component on your control circuit board, which is actually made by Samsung. We regularly repair these control panel assemblies nationwide for $32.50, so the problem can certainly be fixed economically. Looking at typical microwave wiring shows it has to be the cooking relay or a device that drives that relay. Since it stops when you open the door, we can say the door switches are certainly doing their job.

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