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EUFY·FAULT ERR S3 WARN

eufy Error S3 — Side brush error

Severity: Warning — the side brush motor reports a fault — clean first, then service G30/G40L70X8LR/L35
Last verified: 2026-07-06 Tools: scissors for wrapped hair Time: ~10 min Difficulty: easy

DIRECT ANSWER

Error S3 means the side brush module reports a fault — the escalation of Error 3. Strip hair off the brush and its connector, swap in a spare brush if you have one, and escalate to support if S3 returns.
#meaning · #causes · #fix · #parts — link straight to any section

COMMON CAUSES · RANKED

1

Chronic tangle stalling the motor MOST COMMON

Hair left wrapped for weeks overloads the small side-brush motor until the module-level fault trips.

2

Debris in the brush connector

eufy's fix includes cleaning the connector where the brush snaps on — grit there blocks the drive.

3

Side brush motor failure UNCOMMON

If a fresh brush snapped on correctly still triggers S3, the motor assembly has failed — a service case.

HOW TO FIX IT

No battery or electrical work involved in this fix.

Clean brush and connector

Power off, pull the side brush off its post, strip wrapped hair, and clean the connector area on the robot.

Refit until it clicks

Press the brush back on until it snaps — eufy notes a correct fit makes an audible click — then run a short clean.

Try a replacement brush

Fit a spare or new side brush; a persistent S3 with a new brush means the motor needs service — contact eufy support.

COMPATIBLE PARTS

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Side brush — G30 series

Side brush — G30 series

G30G30 EdgeG30 Hybrid

The G30 uses a single side brush; clean the connector under it when you swap brushes — grit there is a documented trigger for Errors 3 and S3.

Compatibility and replacement details → Check price on Amazon ↗

Sources

Verification

OFFICIAL SOURCE

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

Corrections

Spotted an error? Report a correction — fixes ship within 48h and are logged on this page.