Dyson humidifier shows F8 and stops, often associated with very low or no humidity output despite water in tank

Safety first: Unplug the unit before cleaning sensor areas.

• 1. Locate sensor vents: On many Dyson humidifiers, the humidity sensor is behind a small grille or slot on the body. Refer to your user manual for the exact location.
• 2. Clean sensor opening: Use a soft brush or compressed air to gently clean the sensor vent. Do not insert liquids or sharp objects into the opening.
• 3. Avoid steam exposure: Ensure the sensor area is not directly in the path of mist output, which can cause condensation and false readings. Reposition the unit if necessary.
• 4. Reset and test: After cleaning, plug the unit back in, set a humidity target, and observe. If F8 reappears quickly, the sensor or its circuit is likely defective.
• 5. Replacement: RH sensor replacement requires opening the housing and disconnecting a small sensor board or module from the main PCB. This is best done by a professional.