Washer-dryer combo shows F13 during drying cycle; drying does not start or stops quickly.

Safety first: Unplug the combo and allow time for internal components to cool before working near the dryer section.

Step-by-step checks:

• Clean lint paths: Remove rear or front panels as needed to access the dryer air duct. Clean lint from the blower housing, ducting, and lint filter housing.
• Inspect dryer fan: Spin the blower wheel by hand; it should rotate freely without wobble. Check for broken blades or obstructions.
• Test dryer NTC: Locate the dryer temperature sensor on the heater housing or exhaust duct. Disconnect and measure resistance at room temperature (typically 10–20kΩ; verify spec). Replace if open, shorted, or far out of range.
• Check wiring: Ensure all connectors in the dryer circuit are tight and undamaged.

When to replace: Replace a faulty dryer NTC or fan motor as needed. If components test good but F13 persists, the main control board may not be reading the sensor correctly and may require replacement.