If the tank stays empty, it’s usually one of a few simple issues. Check these in order and you’ll often solve it quickly.
Quick Checks
1) Humidity is already low: the unit may not need to collect.
2) Wrong mode or target: set a higher fan or lower target (50%).
3) Room too cold for compressor models: use desiccant or warm the room.
4) Blocked filter or intake: clean filter and vents.
5) Hose mode enabled: if a drain hose is fitted, the tank won’t fill.
Placement And Airflow
Keep 20–30 cm space around the unit. Shut windows in wet weather. Close doors if drying one room.
When To Contact Support
If the unit makes unusual noises, shows error codes, or never starts the compressor/fan.
FAQs
Should the window be open? Not during damp weather if you’re drying the room.
How long to see results? Often within a few hours in a damp room.
Looking for product picks? Read our Best Small Dehumidifiers for Bedrooms (UK).
Last Updated on 30 November 2025 by YEG