Sparks and loud hum from oven

ApplianceMaytag Microwave


Level of DifficultyReally easy

Time to do repair15 - 30 mins

Age of Appliance1 - 4 years

Tools Pliers
Screw drivers

Guy From Bellingham, MA

Dec 06, 2007

57 out of 91 people found this instruction helpful

1. I went to the internet to find the service manual for the Maytag microwave.
2. I opened up the oven and started measuring the resistance of the diode, capacitor, transformer, and magnetron between terminals and then to ground. The transformer and magnetron were well within the resistance limits. The diode was shorted in both directions(+-). The capacitor was fully open in both directions -- high resistance.
3. I ordered the 2 parts, installed them, and ran the oven. Worked perfect first time.
4. Reinstalled oven and worked ever since (1 week so far).
5. The secret was that the transformer had a load hum. I figured the transformer was OK. The magnetron had no short between filaments and ground to filaments. The only two left were the diode and capacitor. The first two are about $200 -- almost the value of a new microwave. The $70 repair was well worth it. If the first two were still bad, then tempted to buy a new oven.

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Diagrams and Parts List for this repair

Part PhotoPart DescriptionPriceAvailability

USE WPL 59001168 (Now subbed to Capacitor)

Part Number: PS2055685

In Stock

USE WPL R9800486 (Now subbed to Black Sleeve Diode)

Part Number: PS2174100

In Stock