Display shows E4 and the unit may shut down unexpectedly.

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

Heater shorted to chassis, Damaged insulation on heater leads, Faulty triac/relay on control board, Surge-damaged PCB

Safety first: Unplug immediately. Do not attempt to restart until inspected.

Check for burning smell or smoke: If present, discontinue use permanently until repaired.
Visual inspection: With basket removed, inspect the heater area for melted insulation or arcing marks.
Do not use: E4 indicates a potentially dangerous electrical fault. Do not continue to operate the appliance.

Warning: This fault requires professional diagnosis of the heater and control board. Contact an authorized Panasonic service center.

Professional Required 5/5

Control PCB (Heater Drive Circuit)

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