Washer-dryer combo shows E18 and may stop heating or drying; often associated with overheating conditions.

Safety first: Unplug the appliance and allow it to cool completely before servicing. Overheating can be a fire hazard.

Step-by-step checks:

• 1. Restore airflow: Follow the airflow cleaning steps from E17: clean lint filter, internal ducts, blower housing, and external vent.
• 2. Locate dryer thermistor: Typically mounted on the exhaust duct or blower housing. Access via rear or lower front panel.
• 3. Test thermistor: Disconnect the thermistor and measure resistance at room temperature. Compare to Monogram specifications. Replace if out of range or open.
• 4. Check high-limit thermostat: Test for continuity. An open thermostat indicates it has tripped and must be replaced, but also investigate and correct the cause of overheating.
• 5. Inspect wiring and control: Ensure all connectors are secure and wiring is intact. Look for signs of overheating on the control board near the heater relay.
• 6. Replace faulty parts: Install OEM Monogram thermistor and thermostat as needed. Reassemble and test a short dry cycle while monitoring temperature.

When to call a technician: Persistent E18 after component replacement may indicate a control board issue or more complex airflow problem requiring professional service.