Microwave runs (light and turntable on) but food remains cold; E03 appears on display.
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: The high-voltage section of a microwave (transformer, capacitor, diode, magnetron) can deliver lethal shocks even when unplugged. Do not attempt to service these components unless you are a trained technician with proper tools and procedures for discharging capacitors.
User-level checks:
- Confirm you are using microwave-safe cookware and not metal or foil, which can interfere with heating.
- Test with a known-good load: a large mug of water on full power for 2 minutes. If the water is still cold and E03 appears, internal HV components are likely faulty.
- Listen for abnormal humming, buzzing, or arcing sounds during operation and stop immediately if heard.
What a technician will do:
- Unplug and safely discharge the high-voltage capacitor.
- Test the magnetron for continuity and shorts to ground.
- Measure the high-voltage transformer primary and secondary windings.
- Check the capacitor and diode with appropriate test equipment.
- Replace the failed component(s) and verify no arcing or burn marks in the waveguide or cavity.
Recommendation: Due to the high risk, this repair should be left to an authorized Candy service center. Do not continue using the microwave if it runs without heating.