Microwave displays E09 and will not heat; fan and light may run normally.
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
How to Fix / Troubleshooting
Critical safety warning: Inverter-based microwaves use high-frequency high-voltage circuits that are extremely dangerous. Do not attempt inverter repairs unless you are trained and equipped for high-voltage electronics work.
User-level actions:
- 1. Power reset: Unplug the microwave for 10–15 minutes to allow the inverter to discharge and reset. Plug back in and test with a cup of water.
- 2. Ventilation check: Ensure vents are not blocked and that the unit is not installed in a confined space causing overheating.
Technician-level checks:
- 3. Inspect inverter board: With the cabinet removed and capacitor safely discharged, visually inspect the inverter power module for burnt components or cracked solder joints.
- 4. Test magnetron and inverter: Measure magnetron resistance and check for shorts. Verify inverter output under controlled conditions.
Recommendation: E09 almost always requires inverter or magnetron replacement and should be handled by a professional.
Repair Difficulty
Required Part
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