Microwave runs but does not heat; display shows E03 after a few seconds.
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: High-voltage components inside a microwave (transformer, capacitor, diode, magnetron) can store and deliver lethal voltages even when unplugged. Do not attempt internal repairs unless you are a trained and certified technician with proper tools and procedures for discharging capacitors.
User-level steps:
- 1. Confirm symptom: Place a microwave-safe cup of water inside and run on HIGH for 1–2 minutes. If the turntable rotates and the light is on but the water remains cold and E03 appears, heating circuitry is likely faulty.
- 2. Power reset: Unplug the unit for 10 minutes, then plug back in and test again. If E03 returns, internal components require service.
- 3. Check outlet: Plug the microwave into a different properly grounded outlet (no extension cords) to rule out supply issues.
Do not remove the cabinet or attempt to access the high-voltage section. Contact Breville support or a qualified appliance technician for diagnosis and replacement of the high-voltage components.
Repair Difficulty
Required Part
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