ROBOROCK·FAULT ERR 21 WARN

Roborock Error 21 — Vertical bumper pressed

Q: Roborock Error 21 — Vertical bumper pressed

Error 21 means the vertical bumper is pressed — the spring-loaded cover over the LiDAR turret that detects when the robot wedges under furniture. Free the robot, make sure the cover moves, and retry.

Severity: Warning — robot stops because something is pressing down on its LiDAR cover S6S7S8Q

Last verified: 2026-07-05 Tools: none Time: ~3 min Difficulty: easy

DIRECT ANSWER

Error 21 means the vertical bumper is pressed — the spring-loaded cover over the LiDAR turret that detects when the robot wedges under furniture. Free the robot, make sure the cover moves, and retry.

#meaning · #causes · #fix · #models — link straight to any section

COMMON CAUSES · RANKED

Robot wedged under low furniture MOST COMMON

Sofas and beds a few millimetres too low press the turret cover down and pin it there.

Object resting on the robot

A fallen curtain hem or a draped blanket is enough weight to hold the bumper pressed.

Debris jammed under the cover UNCOMMON

Grit in the gap around the turret cover keeps the switch closed after the obstacle is gone.

HOW TO FIX IT

No battery or electrical work involved in this fix.

Pull the robot out

Slide it out from under whatever it is wedged beneath.

Press and release the turret cover

It should travel down and spring straight back. Clear any grit from the gap if it sticks.

Restart, then fence off the spot

Retry the clean and add a no-go zone under the offending furniture in the app.

Did this fix your robot?

No reports yet for this fix — be the first.

RELATED FIRMWARE

S7 series (S7, S7 MaxV)

SAMPLE DATA — dataset in progress

4.1.2_07984.1.5_11964.3.5_16124.5.3_5936

Firmware timelines are rebuilt monthly from release notes. Versions marked as sample data are community-reported and not yet verified. Full firmware timeline →

MODELS AFFECTED

Model	Status	Firmware	Parts	Verified
Roborock S6	limited	s6	Parts →	2026-07-05 · Source
Roborock S7	active	s7	Parts →	2026-07-05 · Source
Roborock S8	active	s8	Parts →	2026-07-05 · Source
Roborock Q5 / Q7	active	q	Parts →	2026-07-05 · Source

Models resolved from the series chips above. Support status comes from our EOL library; rows link to the matching parts and firmware pages.

Sources

Verification

OFFICIAL SOURCE

Last verified: 2026-07-05 · How we verify a fault code

Corrections

Spotted an error? Report a correction — fixes ship within 48h and are logged on this page.