Error 42
Dock Maintenance Brush Jammed
Applies to: Roborock
What does Error 42 mean?
Dock mop-wash maintenance brush jammed (left stop = debris jam; right stop = water filter blocked or not seated).
How do I fix Error 42?
If the maintenance brush stopped on the left, clear debris jamming the brush path. If it stopped on the right, clean or reseat the cleaning-sink water filter until it clicks. Wipe grit from the cleaning tank and retry mop washing. If Error 42 returns with a clear brush path and locked filter, request dock brush-module repair.
Still stuck?
Run the free diagnosis wizard for step-by-step checks, or mail the robot to Brisbane if DIY is not enough.