This microwave high-voltage capacitor stores and releases energy in the high-voltage circuit to power the magnetron. Replacing a failed capacitor helps restore proper heating and protects other components in the high-voltage system.
- Works with the transformer and high-voltage diode to supply the magnetron with the required voltage
- Failure may result in the unit running but not heating
- Shorted capacitors can blow the internal fuse or trip a breaker; opens may cause loud humming or buzzing
- Visible swelling or leakage on the capacitor body are common failure signs
What's included: One high-voltage capacitor Install notes:
- Unplug the microwave; capacitors can retain a dangerous charge even when unplugged—discharge using an appropriate, insulated method before servicing
- Note wire positions and terminal orientation; transfer any mounting hardware from the original part
- Mount securely and route wires to avoid pinching
Do-It-Yourself Stories from Customers like You
Microwave oven was not heating Scott S. • Charlotte , NC • June 20, 2017
I ordered the capacitor, diode, and magnetron in hopes that I would be able to complete the repair using the less expensive parts. I first removed the oven from the wall and then I removed the metal housing to access the internal parts. I discharged the capacitor using a pair of insulated needle nose pliers. Then I changed out the diode and the capacitor and reassembled the unit and tested it. It still did not heat so I disassembled the unit again and replaced the magnetron this time....
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