4055837316 Genuine High Voltage Diode for Electrolux Group Microwaves, Microwave HV Rectifier Diode Replacement

A microwave that runs, lights up and turns the plate but won't heat often has a fault in its high voltage circuit, and 4055837316 is a genuine Electrolux high voltage diode for that circuit. Together with the transformer and capacitor, the diode supplies the magnetron that produces the heat. It's an Electrolux group microwave part, though we don't hold a model list for it, so match the number on your old diode or ask us first.

Microwave not heating? How the high voltage diode fits in

Inside a microwave, the high voltage transformer, capacitor and diode form a voltage doubler that feeds several thousand volts to the magnetron. The diode lets current flow one way only. When it fails it can short or go open circuit, and the usual result is a microwave that hums and turns but leaves food cold. A shorted diode may also make the transformer buzz loudly or blow the main fuse. Diodes, capacitors and magnetrons can produce similar symptoms, so these parts should be tested properly by someone trained on high voltage circuits rather than replaced by guesswork.

Part details

• Genuine Electrolux part 4055837316
• High voltage diode for the microwave HV circuit
• Electrolux group microwave part, model fit not on file
• For fitting by a qualified technician

Safety before you touch a microwave

This is not a DIY job. The high voltage capacitor in a microwave can hold a dangerous charge long after the oven is unplugged, and the circuit runs at lethal voltage. Have the diode replaced by a qualified appliance technician or licensed electrician who will unplug the oven, discharge the capacitor safely, fit the new diode facing the same way as the old one, and check for microwave leakage afterwards.

Questions about this part

Should I replace the capacitor at the same time?

Not automatically. A technician should test the capacitor, diode and magnetron to find which part has failed. Some repairers do replace the diode and capacitor together when one has shorted, but it depends on the test results.