Microwave stops heating shortly after start and displays E02; fan may continue to run briefly.

Safety first: Unplug the microwave. Internal components can store high voltage; do not touch the high-voltage section. If you smell burning or see smoke, do not attempt further use.

Step-by-step checks:

• 1. Check ventilation: Ensure the microwave has proper clearance on all sides as specified in the Paderno manual. Clear any obstructions from intake and exhaust vents.
• 2. Inspect cooling fan operation: Run the microwave with a cup of water and listen for the internal cooling fan. If the fan is not running or is unusually noisy, it may be failing.
• 3. Access internal thermostats: With the unit unplugged and cabinet removed, locate the magnetron thermostat and cavity thermostat (small round devices with two terminals mounted on metal surfaces). Visually inspect for signs of overheating.
• 4. Test thermostats: Using a multimeter, check continuity across each thermostat at room temperature. A normally closed thermostat that reads open is faulty and must be replaced.
• 5. Inspect for dust buildup: Carefully vacuum dust from the fan blades and air channels without disturbing wiring.
• 6. If E02 recurs: The magnetron may be overheating due to internal failure. Do not continue using the microwave; contact a professional technician.