Washer-dryer combo shows F13 and will not start drying; drying cycle aborts quickly.

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

Step-by-step checks:

• 1. Clean lint paths: Remove the lower front or rear panel (model-dependent). Inspect and clean the internal lint duct, blower housing, and any accessible air passages. A blocked duct can cause overheat errors.
• 2. Inspect dryer fan: Locate the dryer fan/blower motor. Check that the wheel is not jammed with lint or debris and that it spins freely by hand.
• 3. Test dryer thermistor: Find the dryer thermistor on the exhaust duct or heater housing. Disconnect it and measure resistance at room temperature; compare to the tech sheet. Replace if open, shorted, or far out of spec.
• 4. Wiring check: Inspect the harness from the thermistor and fan motor to the control board. Repair any damaged wires or loose connectors.
• 5. Replace faulty parts: If the fan motor does not run when commanded (and has proper voltage), replace the fan motor. Replace the thermistor if resistance is incorrect.