ROBOROCK·FAULT ERR 26 WARN
Roborock Error 26 — Wall sensor blocked
Severity: Warning — robot pauses until the side-facing sensor can see again S5Q
DIRECT ANSWER
Error 26 is the wall sensor dirty error as numbered on the S5 Max and Q series — same fault the S6 and S7 report as Error 15. Dust is covering the side sensor. Wipe it and restart.
#meaning · #causes · #fix — link straight to any section
COMMON CAUSES · RANKED
1
Dust build-up on the sensor window MOST COMMON
The wall sensor rides along skirting boards all day and fogs over faster than anything else on the robot.
2
Residue splash from mopping UNCOMMON
On mopping runs, dirty water mist can dry onto the sensor window as a film.
HOW TO FIX IT
No battery or electrical work involved in this fix.
Wipe the wall sensor
Soft dry cloth on the sensor window on the robot's right side. Ten seconds of work.
Restart the clean
Resume from the app or the clean button.
Make it monthly
Roborock's maintenance schedule says to wipe all sensors monthly — it keeps this error from coming back.
Did this fix your robot? No reports yet for this fix — be the first.
RELATED FIRMWARE
S5 series (S5)
SAMPLE DATA — dataset in progress3.3.9_0017683.5.4_0019103.5.7_0020083.5.8_0020203.5.8_002034
Firmware timelines are rebuilt monthly from release notes. Versions marked as sample data are community-reported and not yet verified. Full firmware timeline →
Corrections
Spotted an error? Report a correction — fixes ship within 48h and are logged on this page.