Safety: Unplug the microwave and allow it to cool completely before inspection.

Immediate actions:

1. Allow cooling: Leave the door open and let the unit sit unplugged for 30–60 minutes to allow the cavity thermostat to reset (if it is a resettable type).
2. Check for misuse: Ensure the microwave was not run empty or with metal containers, which can cause overheating.
3. Inspect vents: Check all external vents for obstructions (plastic bags, boxes, grease buildup). Clean with a soft brush and ensure adequate clearance around the unit.

Further checks (advanced):

Remove the outer cover (after unplugging) and locate the cavity thermostat / thermal cut-out mounted on the top or side of the cavity.
Test the thermostat for continuity at room temperature. If it remains open after cooling, it has failed and must be replaced.
Verify the cooling fan motor runs whenever the magnetron is energized. If the fan is seized or not powered, replace or repair as needed.

Note: Repeated E5 errors indicate a cooling or usage problem. Correct any airflow issues before replacing parts.

Microwave shows E5 and stops heating; fan may continue to run for a short time.

Possible Causes