Microwave beeps and shows E2 shortly after starting; cooking stops automatically.

Safety warning: Unplug the microwave before any disassembly. Internal components can store high voltage. Do not touch the high-voltage section (transformer, capacitor, magnetron) unless you are qualified.

Steps to diagnose:

• 1. Allow the unit to cool: If the microwave has been used repeatedly, leave the door open and allow it to cool for 30–45 minutes. Plug back in and test. If E2 clears temporarily, overheating may be stressing the sensor.
• 2. Locate the cavity sensor: On most Morphy Richards microwaves, the cavity thermistor is mounted on the top or side of the cooking cavity, often behind a small metal cover or near the air outlet channel.
• 3. Visual inspection: With the unit unplugged and outer cover removed, inspect the thermistor body and its wiring. Look for burnt insulation, melted plastic, or a sensor that has come loose from its mounting bracket.
• 4. Check connections: Trace the thermistor wires back to the control PCB. Ensure the plug is fully seated and that there are no corroded or broken pins.
• 5. Test resistance: Using a multimeter, measure the thermistor resistance at room temperature. Compare with the service manual specification (commonly in the tens of kilo-ohms). A reading of near 0 Ω (short) or infinite (open) indicates a failed sensor.
• 6. Replace if faulty: If the thermistor is defective, remove the mounting screw or clip, disconnect the plug, and install a new Morphy Richards-compatible cavity thermistor. Route the wires away from hot or moving parts.
• 7. Reassemble and test: Refit the covers, plug in, and run the microwave with a cup of water for 1–2 minutes to confirm that E2 does not reappear.

Note: If the thermistor tests good but E2 persists, the control PCB temperature-sensing circuit may be faulty and should be checked by a professional.