Microwave shows H15 and stops heating or will not start.

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

Defective inverter board, Power supply issues on control PCB, Loose wiring to inverter

Safety: Inverter and internal wiring are not user-serviceable.

Steps:

Check power source: Plug the microwave directly into a dedicated wall outlet. Avoid extension cords.
Reset: Unplug for 10 minutes, then plug back in.
Test with light load: Heat a single cup of water for 30–60 seconds.

If H15 reappears: Internal inverter or control circuitry is likely faulty. Contact a Panasonic service technician.

Professional Required 5/5

Inverter Board (Power Supply Module)

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