E05
Bosch Inverter / Power Supply Fault (Inverter Models)

Microwave shows E05 and will not start or stops shortly after starting.

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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.

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Possible Causes

Defective inverter board, Shorted magnetron drawing excessive current, Loose power connections on inverter, Control board power drive fault

How to Fix / Troubleshooting

Safety warning: Inverter-based microwaves operate at high frequency and high voltage. Do not open the cabinet or touch internal wiring.

  • Power reset: Unplug the microwave for at least 10 minutes to allow the inverter and control electronics to discharge and reset. Plug back in and test with a short 30-second heating cycle.
  • Check for overloading: Ensure you are not using metal containers, foil, or oversized dishes that may cause arcing or overload. Test with a single cup of water only.
  • Verify supply voltage: If possible, test the outlet with another high-load appliance. Low or unstable voltage can trigger inverter errors. Avoid using long extension cords or power strips.

If E05 reappears: The inverter module or magnetron is likely defective. These components are not user-serviceable and must be replaced by a Bosch-authorized technician.

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Repair Difficulty

Professional Required 5/5

Required Part

Inverter Power Module
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