Microwave runs but does not heat; display shows E03 after a few seconds

CRITICAL SAFETY WARNING: The high-voltage section of a microwave (transformer, capacitor, diode, magnetron) can store and generate lethal voltages. Do not attempt to test or replace these components unless you are a trained appliance technician with proper tools and know how to discharge the capacitor safely.

For basic users, only external checks are recommended.

• Step 1 – Confirm symptom:
  • Place a cup of water inside and run on full power for 1–2 minutes.
  • If the turntable rotates and the interior light is on but the water remains cold and E03 appears, the high-voltage system is likely at fault.
• Step 2 – Basic user checks:
  • Unplug the unit for 5–10 minutes to reset the control board.
  • Check that the power outlet is properly grounded and not using an extension cord.
• Step 3 – Professional checks (for technicians only):
  • Remove the cabinet and visually inspect the high-voltage transformer, capacitor, and diode for burn marks or melted insulation.
  • Discharge the capacitor safely using a resistor-rated discharge tool.
  • Test the high-voltage diode and capacitor with appropriate test equipment.
  • Replace any failed component with SilverCrest-compatible parts of identical ratings.

Due to the danger involved, most users should contact a qualified service center for E03 faults.