Maytag High-Voltage System Fault

Microwave displays E4 and may not heat or may shut off quickly.

Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Failed high-voltage transformer or inverter, Shorted high-voltage capacitor, Faulty magnetron, Loose high-voltage wiring

How to Fix / Troubleshooting

Critical safety warning: High-voltage microwave components can be lethal. Do not attempt to service the high-voltage system unless you are trained.

User action:

Unplug the microwave and discontinue use.
Schedule service with a qualified technician.

Likely repair:

A technician will test the transformer or inverter, capacitor, diode, and magnetron, and replace the defective part(s).

Repair Difficulty

Professional Required 5/5

Required Part

High-Voltage Transformer or Inverter

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