Drying function does not heat; clothes remain damp after drying cycle; E09 displayed

Safety first: Unplug the washer-dryer and allow it to cool completely before working on the dryer section.

• 1. Clean lint and condenser: Remove and clean the lint filter. If your Bosch combo has a user-accessible condenser, remove it and rinse thoroughly to clear lint and scale. Blocked airflow can cause overheating and heater shutdown.
• 2. Check air ducts: Inspect accessible air channels for lint buildup and vacuum them carefully.
• 3. Access dryer heater: Depending on model, remove the top and rear panels to locate the dryer heating element assembly and thermal cut-outs.
• 4. Test heater and TCO: With a multimeter, check continuity across the heater terminals and thermal cut-out. An open circuit indicates a failed component that must be replaced.
• 5. Replace faulty parts: Install a new Bosch dryer heating element and/or thermal cut-out as needed, ensuring all wiring is correctly reconnected and secured.
• 6. If E09 returns: The main control board may not be powering the heater. Professional diagnosis is recommended to avoid misdiagnosis and repeated part failures.