ROOMBA·FAULT ERR 9 WARN
Roomba Error 9 — Bumper stuck
Severity: Warning — robot won't drive while it thinks it's pressed against a wall 600eijs
DIRECT ANSWER
Error 9 means the bumper is stuck or its sensor reads as permanently pressed. Usually grit trapped behind the bumper; sometimes the bumper got knocked out of place. Tap it around the edge, then press CLEAN.
#meaning · #causes · #fix — link straight to any section
COMMON CAUSES · RANKED
1
Debris trapped behind the bumper MOST COMMON
Grit in the gap stops the bumper from springing back after contact.
2
Dislodged bumper UNCOMMON
A hard knock or a drop can pop the bumper off its mounts so it hangs pressed.
3
Failed bumper switch RARE
If the error survives cleaning and realignment, the internal sensor has failed.
HOW TO FIX IT
No battery or electrical work involved in this fix.
Tap the bumper briskly
Tap several times across the front and sides to shake debris out of the gap, then press CLEAN.
Work the bumper in and out
Press it in along its full length. It should move and spring back evenly everywhere.
Check the alignment
Look for uneven gaps between bumper and body. A dislodged bumper needs to be clipped back onto its mounts.
Reboot the robot
Hold CLEAN until the robot reboots. If error 9 returns right away, the bumper sensor needs service.
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Corrections
Spotted an error? Report a correction — fixes ship within 48h and are logged on this page.