visible sparking inside top of MW unit

ApplianceWhirlpool Microwave


Level of DifficultyReally easy

Time to do repair15 - 30 mins

Age of Appliance1 - 4 years

Tools Screw drivers

Robert From Charleston, SC

Jul 24, 2012

Remove the two screws to the plastic vent strip at the top of the unit. That exposes a metal cover (upper right) held in place by two more screws. (Found that removing the screw holding the key panel in place and moving that out of the way made for more work room) Remove the metal cover. The HV diode (visible) on one end is secured to the chassis by a screw. The other end is fitted to the HV capacitor. So unscrew one end and pull the HV diode off the capacitor. The replacement fits on like the old one came off. Very simple repair. But it would be safe to short the capacitor terminals to the chassis first. Noticed that it appeared the sparking was caused by the HV diode's outer casing being worn by the asbestos covered wire next to it and laying against it. I made sure the two were not touching, before putting the covers back on. Also, the problem started with an occasional spark when the MW started. It quickly deteriorated to a full, non-stop electrical sparking. You can hear it, smell it, and see it through the top vent. You don't need to remove unit to work on it.

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Diagrams and Parts List for this repair

Part PhotoPart DescriptionPriceAvailability

H.V. Diode (Now subbed to DIODE)

Part Number: PS5136042

In Stock