This high-voltage rectifier diode is used in the microwave's high-voltage circuit. It converts AC to DC so the magnetron can produce heat. A failed diode can cause no heat, loud humming, or a blown fuse when starting. What it does:
- Rectifies high-voltage AC to DC to power the magnetron
- Blocks reverse voltage in the HV circuit
- Common failure symptoms can include: runs but doesn't heat; loud hum then shutdown; line fuse blows at startup
What's included:
Install notes:
- Unplug the microwave and properly discharge the high-voltage capacitor before servicing—dangerous voltage can remain even when unplugged
- Match diode orientation/polarity to the original and ensure a solid chassis ground connection where used
- Route leads and reinstall any clamps/insulators exactly as found; keep wiring clear of sharp edges and hot components
- If the original diode failed, inspect the HV capacitor and transformer for related issues before reassembly
Do-It-Yourself Stories from Customers like You
No heat Thomas S. • Port Jefferson Sta. , NY • August 23, 2015
I replaced both the Magnetron and the high voltage diode. I now have a fully functional microwave. I received the parts on time and the quality was good. I would use appliance parts pro's again.
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