Microwave does not heat; fan and turntable may run, but food stays cold and E03 appears on the display.

Critical safety notice: The high-voltage section (transformer, capacitor, diode, magnetron) can store and generate lethal voltages. Do not open the cabinet or attempt to test these parts unless you are a trained appliance technician.

• Basic user checks: Confirm that the outlet has power and that the microwave is not on a tripped breaker. Try another appliance in the same socket.
• Reset attempt: Unplug the microwave for 5–10 minutes to reset the control board, then plug back in and test.
• If still no heat with E03: Internal high-voltage components are likely faulty. Continued use may cause further damage.
• Professional repair: A technician can test the high-voltage fuse, capacitor, diode, and transformer with appropriate tools and replace the defective component with a Princess-compatible part.