5550428022 Genuine High Voltage Diode for Electrolux Group Microwave Ovens, Microwave HV Rectifier Diode Replacement

Part 5550428022 is a genuine Electrolux HV diode, the high voltage diode from a microwave oven's power circuit. It works with the HV transformer and capacitor to produce the high DC voltage the magnetron needs. We don't have a list of models for it, so match the number and the look of your old diode before ordering.

Microwave not heating or buzzing loudly? Test the HV diode

The HV diode only lets current flow one way, which turns the transformer's high AC output into the DC voltage the magnetron runs on. Diodes can fail shorted or open. A shorted diode often causes a loud hum or buzz and may blow the main fuse, while an open diode leaves the magnetron without power, so the oven runs but food stays cold. Because the capacitor, diode and magnetron can all cause a no-heat fault, a technician will usually test each one rather than guess.

Part details

• Genuine Electrolux part 5550428022
• High voltage diode for a microwave HV circuit
• Converts the transformer output for the magnetron
• Ordered by part number, no model list on file

Microwave high voltage safety

Only a trained technician should work inside a microwave. Unplug the oven and discharge the HV capacitor before touching the diode or any high voltage wiring, as it can stay charged after the power is off. Fit the new diode the same way round as the old one, with each end on the same terminal. Have the oven leakage tested before it's used again.

Questions about this part

Should the capacitor be replaced at the same time?

Only if it tests faulty. A shorted diode can sometimes damage other parts in the HV circuit, so have a technician test the capacitor and magnetron as well before deciding what to replace.