Dryer runs but takes excessively long to dry clothes; laundry is still damp after the normal program duration.

Safety first: Unplug the dryer before cleaning internal components.

• Clean lint filter: Remove lint from the filter after every load. Wash the filter with warm soapy water if it appears coated.
• Clean condenser/heat exchanger: For condenser and heat pump models, remove the condenser unit and rinse thoroughly to remove lint and dust. Allow to dry before refitting.
• Inspect exhaust duct (vented models): Disconnect the duct from the dryer and wall. Remove lint buildup and straighten any kinks or crushed sections.
• Check room conditions: Ensure the dryer is in a well-ventilated area and ambient temperature is within the recommended range.
• Test heating performance: Run the dryer empty on a heated program for 10 minutes and check if the exhaust air is hot. If only lukewarm or cold, further diagnosis of the heater or heat pump is required.