Microwave stops heating shortly after start and displays E2 on the control panel.

Safety first: Unplug the microwave. Internal components can store high voltage; do not touch the capacitor or magnetron terminals.

Basic checks:

• Check ventilation: Ensure the microwave has proper clearance on all sides and that rear and side vents are not blocked by cabinets, walls, or objects.
• Clean air paths: Remove grease and dust from intake and exhaust vents using a soft brush and vacuum.
• Inspect cooling fan: Remove the outer cabinet. Locate the cooling fan motor near the magnetron. Spin the fan blade by hand; it should turn freely without binding. If seized or noisy, replace the fan motor.
• Test magnetron thermostat: Locate the thermal cutout/thermostat mounted on or near the magnetron. With the unit unplugged and wires removed, test for continuity with a multimeter. A normally closed thermostat should show continuity at room temperature. If open and does not reset after cooling, replace it.
• Check for signs of overheating: Look for discoloration or burning around the magnetron and wiring. If the magnetron shows burn marks or a cracked ceramic insulator, it should be replaced by a professional.

Reassembly: After replacing any faulty parts, reassemble the cabinet, restore power, and test with a cup of water for 1–2 minutes. Monitor for recurrence of E2.

Warning: Magnetron and high-voltage repairs are hazardous. If you are not experienced, have a technician perform component replacement.