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ROOMBA·FAULT ERR 6 WARN

Roomba Error 6 — Cliff sensor problem

Severity: Warning — robot refuses to move until it trusts the floor again 600eijs
Last verified: 2026-07-05 Tools: melamine foam or a dry cloth Time: ~5 min Difficulty: easy

DIRECT ANSWER

Error 6 means the cliff sensors think the robot is at a drop-off. It's stuck at a real edge, the sensors are dusty, or a dark floor reads as a cliff. Wipe the sensors and move the robot.
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COMMON CAUSES · RANKED

1

Dusty cliff sensors MOST COMMON

A film of dust over the sensor windows blinds them, so every surface looks like a drop.

2

Robot hanging at a real edge

It stopped half over a stair nose or a sunken floor transition and can't back away.

3

Dark or black flooring

Very dark carpet or tile absorbs the sensor beam, which the robot reads as a cliff.

HOW TO FIX IT

No battery or electrical work involved in this fix.

Move the robot and restart

Carry it to open floor away from stairs and press CLEAN.

Wipe the cliff sensors

Turn the robot over and wipe all sensor windows along the front underside with lightly dampened melamine foam. Let them dry.

Keep it off problem surfaces

If a dark rug triggers the error every pass, block it with a Virtual Wall or a keep-out zone rather than fighting physics.

COMPATIBLE PARTS

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Dual Mode Virtual Wall barrier

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Runs on two AA batteries and needs no app or cloud, which makes it useful insurance for older Roombas.

Check price on Amazon ↗

Sources

Verification

OFFICIAL SOURCE

Last verified: 2026-07-05 · How we verify a fault code

Corrections

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