Roborock mop not working
DIRECT ANSWER
COMMON CAUSES · RANKED
Tank empty or not clicked in MOST COMMON
The tank has to click into place — pushed in halfway, the water line never connects. And it's easy to forget the refill after the last session.
Water flow set low or off in the app
A room-level setting from a past run can silently keep flow at minimum for that zone.
Scaled filter or drippers
Hard water leaves mineral crust in the tank filter and the dripper holes. Flow shrinks over weeks until the pad comes back dry.
Pad or bracket badly attached UNCOMMON
The bracket must slide in until it clicks, with the pad attached damp — a dry, caked pad won't spread what little water arrives.
Carpet sensor misread or pump fault RARE
On S7 and newer, a dirty carpet sensor can read hard floor as carpet — the mop lifts and water stops. A dead pump is the rare worst case.
HOW TO FIX IT
Fill and click in the tank
Fill with plain water, slide it home until it clicks, and do the same with the mop bracket.
Raise the water flow
In the app, set water flow to medium or high — and check per-room settings if only some zones come out dry.
Descale the filter and drippers
Rinse the tank filter and wipe the dripper holes with a vinegar-dampened cloth to dissolve mineral crust.
Wash the pad, attach it damp
A clean, pre-dampened pad wicks and spreads the water. A caked one blocks it.
Wipe the carpet sensor and retest
On S7 and newer, dry-wipe the carpet sensor window on the underside, restart the robot, and mop a small test zone.
COMPATIBLE PARTS
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Water tank filter — S5
A clogged tank filter starves the mop cloth; replace it if flow stays low after cleaning the tank.
Check price on Amazon ↗VibraRise mop cloth, 2-pack — S7
Wash the cloth after every mopping session; a glazed, stiff cloth streaks the floor.
Check price on Amazon ↗Mop cloth mount bracket — S7
Worn velcro on the bracket lets the cloth slip during VibraRise scrubbing; the bracket clips off without tools.
Check price on Amazon ↗Sources
Verification
Last verified: 2026-07-05 · How we verify a fault code
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