Diagnosis
The cleaning solution is not reaching the roller effectively, or the dock's internal spray nozzles are clogged with hard water or solution residue.
How to Fix It
Ensure you are using genuine Tineco cleaning solution, not plain water or a third-party product. The correct ratio is critical. Fill the clean water tank to the MAX line with clean water, then add one full capful of solution. Run a manual deep clean cycle via the app or by holding the dock button for 3 seconds.
If That Didn't Work
The nozzles are clogged. Unplug the dock. Remove the water tank. Use a toothpick or pin to gently clear the small spray holes inside the dock where the roller sits. Run a water-only clean cycle to flush any dislodged debris.
Heads Up
After cleaning, always remove the roller from the vacuum to air-dry completely. Storing it damp in the dock is the primary cause of mildew odor.