Microwave runs but food remains cold; display may show E03 indicating no microwave power.
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 be lethal. The capacitor can hold a dangerous charge even when unplugged. If you are not specifically trained in microwave high-voltage repair, do not attempt to service these components yourself.
- Basic checks only: Unplug the Amica microwave. Remove the outer cover and visually inspect for obvious burn marks, melted connectors, or a blown line fuse (usually on the filter board). Do not touch the high-voltage capacitor terminals.
- Check cooling fan and turntable: If the fan and turntable operate but there is no heating, the fault is likely in the high-voltage circuit (magnetron, diode, capacitor, transformer).
- Do not bypass safety devices: Never bypass thermal cutouts or door switches to "test" heating.
- Professional service: For E03 or no-heat conditions, contact an authorized Amica service technician to test and replace the magnetron or other high-voltage components using proper discharge procedures and test equipment.