First step: power cycle the unit.
- Unplug the appliance from the wall outlet.
- Wait a moment, then plug it back in.
If the error code clears, you're good. If the same error code continues to be displayed, contact the Dyson Helpline.
One thing to check first: Ensure the filters are correctly installed. The unit can display errors or perform poorly if filters are missing, badly installed, or overdue for replacement.