Loud pop and microwave doesn't heat anymore

Whirlpool Microwave Buzzing Loudly - ApplianceBlog

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Aug 12, 2011 - 10 posts - ‎2 authors
My Whirlpool MT4155SPS-2 microwave oven has recently started to buzz loudlywhen operated. The sound is getting louder and more frequent ...

Whirlpool making intermittent loud buzzing noise Microwave ...

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Whirlpool microwave ovens making intermittent loud buzzing noise related questions and answers. Ask your ... ...loud buzzing noise and it doesn't heat. i just tried it again and let it run for 1 minute. ... Question about Accuwave Microwave Oven.

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If your microwave buzzes loudly and produces no heat you probably have a defective power .... I have a whirlpool oven range and it's less than a year old. .... Humming sound stops when I open door to remove food, but when door is closed, ...

Whirlpool Microwave Ovens - Consumer Affairs

SOUNDS TO ME LIKE YOU BLEW A FUSE WHICH IS INSIDE THE UNIT. IF IT'S UNDER WARRANTY TAKE IT BACK BECAUSE IF YOU OPEN UP THE CASING & FIX YOURSELF THIS VOIDS ANY WARRANTY

Sounds like the inverter (power supply for cooking) or the magnatron which does the work----neither are cheap parts.

No heat would mean the magnetron circuit has failed. It's the part that generates the microwaves that heat the food. If it is making a loud buzzing noise, it could mean that the magnetron or the high voltage diode has failed. Since there exists high voltages inside the oven, would require a qualified service person to repair. However, if the magnetron has failed, would recommend buying a new oven since the parts alone can cost as much as a new oven.

Sorry I can't help you but we purchased this same model 11 months ago and ours just stopped heating this week. Sure expected it to last longer than this.

WHEN THERE IS A BUZZING NOISE IT MEANS THAT ONE OF THE INTERNAL COMPONENT HAS FAILED .RANGING FROM A SMALL DIODE TO LARGE PARTS LIKE
THE MAGNETRON OR TRANSFORMER OR CAPACITOR. IF IT IS 10 YRS,OLD YOUR BETTER
OFF GETTING A NEW ONE .BECAUSE YOU COULD INVEST MONEY IN THIS ONE AND HAVE SOMETHING ELSE GO TWO DAYS FOR NOW.WITH A NEW ONE YOU ALSO END UP WITH THE NEW WARRANTY. HOPE I HELPED. KEN62 GOOD DAY!

HI, the loud popping noise was the Magnetron tube. this is the main heating device. the noise filter is also damaged and, should be replaced as well.

In conclusion, replacing the Magnetron tube and noise filter will fix this unit.

Hi, this is common in most microwaves. this abnormal noise is coming from a faulty Magnetron. this device is responsible for the heating process and, it is damaged and not heating at all at this point.Simply replace the Magnetron and, this unit will start to heat once more.

High voltage parts are suspect. Need to put a voltmeter on the input (primary) side to the high-voltage transformer (big heavy iron thing in there) Should be getting 120Vac when it goes to cook cycle. Don't touch the other (high voltage) side of this transformer. If the power is there, you are looking at replacing either the magnatron or the high-voltage capacitor and diode. Its affordable if you do it yourself - buy the part on EBAY - lookup "universal magnatron"
Hope ya fix it!

The magnetron is bad. Probably cost about $50 or $60 for the part. Not too easy to replace, but it can be done.