Microwave runs (light and turntable on, fan running) but food does not heat at all.

High-voltage danger: Components responsible for heating operate at very high voltage. Do not remove the cabinet or attempt internal repairs yourself.

• Basic checks: Confirm the timer is set correctly and that you are not in a non-heating mode (such as timer or demo mode). Try heating a cup of water for 1–2 minutes.
• Listen and observe: During operation, you should hear a slight hum when the magnetron is energized. If the unit is unusually quiet or makes a loud buzzing, internal HV parts may be faulty.
• Ventilation: Ensure vents are not blocked and filters are clean; overheating can trip thermal cut-outs.
• Professional repair: A technician should test the magnetron, HV diode, HV capacitor, transformer or inverter, and thermal cut-outs with proper tools and replace the failed component(s).