Error 6 — Cliff sensors dirty or robot on a ledge

How to fix it

1. Flip the robot over and locate the 4-6 small clear windows around the front bumper edge underside.
2. Wipe each cliff sensor with a clean, dry melamine sponge (Magic Eraser) or microfiber cloth.
3. For stubborn film, use slightly damp cloth and dry thoroughly.
4. Move robot to a different room with lighter flooring to test.
5. On dark or black rugs, place a light-colored towel as a test surface.
6. If error persists on normal flooring, the cliff sensor or front bumper assembly needs replacement.

Why it happens

Typical signs: 'Error 6, move Roomba to a new location' · Robot stops on dark floors or near furniture · Robot stops mid-room with no obvious cliff · Stops on glossy/reflective floors

• Dirty cliff sensors Dust and debris on the IR sensor windows on the underside cause false readings.
• Dark or glossy flooring Very dark, black, or highly reflective floors can read as a cliff to the IR sensors.
• Robot actually near a ledge Working as designed — stop happened because robot was at a real edge.
• Failed cliff sensor One of the four cliff sensors has internally failed.

Parts you may need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

• Magic Eraser cleaning pads Common replacement
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