De'Longhi dehumidifier runs but does not collect water; humidity in the room remains high.

Safety first: Unplug the unit before cleaning or inspection.

Step-by-step:

• 1. Verify conditions: Ensure the room temperature is within the operating range (typically 5–35°C). At low temperatures, little water will be collected.
• 2. Clean filter and coils: Remove and wash the air filter. Inspect the evaporator and condenser coils and vacuum off dust with a soft brush.
• 3. Check compressor operation: After reassembly, plug in and run the unit. After 5–10 minutes, feel the air from the outlet—it should be slightly warmer than room air. Listen for the compressor humming.
• 4. Inspect for frost: Look at the evaporator coil. A light, even frost pattern is normal in some conditions, but no frost at all and no water in the tank after hours of operation may indicate a refrigerant or compressor issue.
• 5. Test in a smaller room: Move the unit to a smaller, closed room and run for several hours. If there is still no water collection, the sealed system or compressor may have failed.
• 6. Professional repair: Refrigerant and compressor faults require an authorized De'Longhi service technician.