De'Longhi dehumidifier shows CF on the display; unit may still operate but indicates a service reminder.

Safety first: Unplug the unit before cleaning filters or coils.

Step-by-step:

• 1. Remove and clean filter: Slide out the air filter from the front or rear grille. Vacuum off dust, then wash with mild detergent and warm water. Allow to dry completely.
• 2. Inspect coils: With the filter removed, use a flashlight to inspect the evaporator and condenser coils. If dusty, gently vacuum with a soft brush attachment.
• 3. Reset the reminder: On many De'Longhi models, press and hold the filter or timer button (refer to your manual) for 3–5 seconds to clear the CF code after cleaning.
• 4. Reassemble and test: Reinstall the dry filter, plug in the unit, and confirm that CF has cleared and normal operation resumes.