Microwave shows E14 and shuts down; may occur after extended cooking or repeated use.

Safety Warning: Internal thermal devices are safety-critical. Unplug the microwave before inspection. Do not bypass thermostats or thermal cutouts.

User-level steps:

• Check that all vents are clear and that the microwave has adequate space around it.
• Clean dust and grease from vent openings.
• Allow the unit to cool for at least 30–60 minutes, then try a short cook cycle.

Technician-level steps:

• Remove the cabinet and discharge the capacitor.
• Locate the magnetron thermostat/thermal cutout mounted on or near the magnetron.
• Test for continuity at room temperature; if open and non-resettable, replace.
• Verify the cooling fan motor runs properly and that airflow is not blocked internally.
• If the thermostat repeatedly trips, test the magnetron for overheating or excessive current draw and replace if necessary.

Persistent E14 indicates a cooling or magnetron problem that should be addressed promptly to avoid further damage.