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EUFY·FAULT ERR 4 WARN

eufy Error 4 — Rolling brush stuck

Severity: Warning — robot pauses until the rolling brush and its path are cleared G30/G40L70X8LR/L35
Last verified: 2026-07-06 Tools: scissors for wrapped hair Time: ~10 min Difficulty: easy

DIRECT ANSWER

Error 4 means the rolling brush is stuck. eufy's official routine: remove the rolling brush, roller joint, brush guard and suction inlet, clean all of them, and reassemble before restarting.
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COMMON CAUSES · RANKED

1

Hair banded around the roller MOST COMMON

Long hair and pet fur wrap the roller until the motor overloads — the top trigger on every series.

2

Debris at the roller ends and joint

eufy's procedure singles out the roller joint and both end caps — hidden hair there stalls a clean-looking brush.

3

Object jammed in the suction inlet

Sock edges and toy parts wedge between brush and inlet, locking the roller solid.

HOW TO FIX IT

No battery or electrical work involved in this fix.

Power off and open the brush compartment

Turn the robot over and release the brush guard to lift out the rolling brush.

Clean brush, joint, guard and inlet

Remove wrapped hair from the roller, clean the roller joint and both ends, and clear the brush guard and suction inlet of debris.

Reassemble and verify rotation

Refit the brush and guard, then confirm the roller spins freely by hand before restarting the clean.

Replace a worn roller

If the bristles are matted or the ends wobble, fit a replacement rolling brush — a persistent Error 4 with a new brush points at Error S5.

COMPATIBLE PARTS

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Rolling brush — G30 series

Rolling brush — G30 series

G30G30 EdgeG30 Hybrid

eufy's Error 4 routine removes brush, roller joint, guard and suction inlet together — fit a new roller when cleaning no longer frees it.

Compatibility and replacement details → Check price on Amazon ↗

Sources

Verification

OFFICIAL SOURCE

Last verified: 2026-07-06 · How we verify a fault code

Corrections

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