Microwave displays E2 and stops heating shortly after starting.

Safety warning: Unplug the microwave. Internal components can store high voltage; do not touch the high-voltage capacitor or magnetron connections.

• Step 1 – Allow cooling: If the microwave has just been used, let it cool for at least 30 minutes before opening the cabinet.
• Step 2 – Access the cavity sensor: Remove the outer cabinet. Locate the cavity thermistor or temperature sensor, usually clipped to the side of the cooking cavity or on the top panel inside the chassis.
• Step 3 – Inspect and reseat: Check that the sensor is firmly clipped in place and that its wiring connector is fully seated on the control PCB. Look for signs of heat damage or melted insulation.
• Step 4 – Test the sensor: Disconnect the sensor and measure its resistance with a multimeter. Compare to the expected value in the service manual (typically 50–300 kΩ at room temperature). Replace if open, shorted, or far out of range.
• Step 5 – Check thermal cut-outs: Locate the magnetron thermal cut-out and cavity thermal fuse. Test for continuity; replace any that are open.

If all sensors and fuses test correctly, the control PCB temperature circuit may be faulty and should be replaced by a professional.