ROBOFAULTS
Search a code or symptom…
EN ES
ROBOROCK·FAULT ERR 26 WARN

Roborock Error 26 — Wall sensor blocked

Severity: Warning — robot pauses until the side-facing sensor can see again S5Q
Last verified: 2026-07-05 Tools: soft dry cloth Time: ~2 min Difficulty: easy

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 · #models — 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.

RELATED FIRMWARE

S5 series (S5)

SAMPLE DATA — dataset in progress
3.3.9_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 →

MODELS AFFECTED

Model Status Firmware Parts Verified
Roborock S5 limited s5 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.