Oven buzzed and no heat

ApplianceWhirlpool Microwave

ModelMH7140XFQ-0

Level of DifficultyDifficult

Time to do repair1- 2 hours

Age of Appliance5 - 10 years

Tools Nutdriver
Screw drivers
Socket set

Joseph From Saint Charles, IL

Jul 21, 2010

32 out of 36 people found this instruction helpful

First took down the hood/microwave and removed the sheet metal housing.
I changed HV diode as it was the least expensive component and the first one that internet suggested and tested bad with a ohm meter. Didn't fix a thing.
Capacitor failed test with meter so I ordered and then replaced this.
Still no change so I ordered a new magnetron.
Now I have over $100 invested in a 9 year old oven but a new one is three times this so if my time is free I am still ahead.
The magnetron may be the first part installed onto the oven. To remove the old magnetron and install the new the top plastic vent hood moldings and motor had to be removed. Pretty straight forward but not a little amount of work.
The new magnetron did the job and the oven now heats like new.

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Diagrams and Parts List for this repair

Part PhotoPart DescriptionPriceAvailability

Microwave Magnetron

Part Number: PS2352604

$135.59
In Stock