Safety first: Disconnect power and allow the dryer to cool completely before inspection. Surfaces and components may be very hot.

Improve ventilation: Ensure the dryer has adequate clearance from walls and cabinets as specified in the SMEG manual. Do not block ventilation grilles.
Clean internal lint: Remove top and rear panels and vacuum lint from around the heater, motor, and internal ducts. Pay attention to areas near thermostats and sensors.
Check cooling fan (if present): Some models have an internal cabinet cooling fan. Verify that the fan spins freely and runs during operation. Replace the fan motor if seized or not powered.
Test safety thermostat: Locate the safety thermostat on the cabinet or heater housing. With wires disconnected and the unit cool, check for continuity. Replace if open and not resettable.
Reset and test: After cleaning and any part replacement, reconnect power and run a short cycle while monitoring for excessive heat or recurrence of E18.

Dryer shows E18; may stop unexpectedly and require unplugging to reset.

Possible Causes