ROOMBA·FAULT CHG 8 CRITICAL

Roomba Charging Error 8 — Battery communication fault

Q: Roomba Charging Error 8 — Battery communication fault

Charging error 8 means the battery stopped communicating while charging. Reseat the pack and confirm it's a genuine iRobot lithium battery — clones drop the data handshake. Clean the contacts; replace the pack if it recurs.

Severity: Critical — charging refused until the battery handshake is restored 600eijs

Last verified: 2026-07-05 Tools: melamine foam or a soft cloth Time: ~10 min Difficulty: easy

DIRECT ANSWER

Charging error 8 means the battery stopped communicating while charging. Reseat the pack and confirm it's a genuine iRobot lithium battery — clones drop the data handshake. Clean the contacts; replace the pack if it recurs.

#meaning · #causes · #fix · #parts · #models — link straight to any section

COMMON CAUSES · RANKED

Loose battery connection MOST COMMON

The data pins lose contact when the pack shifts even slightly in its bay.

Aftermarket battery without proper comms

Clone lithium packs frequently fail the data exchange iRobot chargers require.

Dirty contacts interrupting data

Grime on charging or battery contacts corrupts the link mid-charge.

Battery electronics failing UNCOMMON

A pack that keeps dropping comms after cleaning and reseating is dying.

HOW TO FIX IT

SAFETY · READ THIS FIRST

Power off and remove the battery before reseating it, and never use a pack with cracked or swollen casing.

Reseat the battery

Power off, remove the pack, wait ten seconds, and reinstall it firmly.

Confirm it's a genuine pack

Check for iRobot lithium-ion markings. If a clone battery is installed, that's your answer.

Clean contacts and wheels

With the dock unplugged, wipe the charging contacts on robot and dock; dirty wheels can also lift the robot off the contacts.

Replace the battery if it recurs

Repeated comms drops from a genuine, clean, well-seated pack mean the battery has failed.

Did this fix your robot?

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COMPATIBLE PARTS

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Lithium-ion battery — e & i series

e5e6i1i3i4i6i7i7+i8

Unplug the robot and remove the bin before opening the battery door; dispose of old cells at a battery recycling point.

Compatibility and replacement details → Check price on Amazon ↗

Lithium-ion battery — s series

s9s9+

A healthy s9 battery runs well over an hour; sudden short runtimes usually mean the pack, not the charger.

Compatibility and replacement details → Check price on Amazon ↗

MODELS AFFECTED

Model	Status	Firmware	Parts	Verified
Roomba 614	limited	600	Parts →	2026-07-05 · Source
Roomba 675	limited	600	Parts →	2026-07-05 · Source
Roomba 690	limited	600	Parts →	2026-07-05 · Source
Roomba 694	limited	600	Parts →	2026-07-05 · Source
Roomba e5 / e6	limited	e	Parts →	2026-07-05 · Source
Roomba i1 / i1+	limited	i	Parts →	2026-07-05 · Source
Roomba i3 / i3+	limited	i	Parts →	2026-07-05 · Source
Roomba i4 / i4+	limited	i	Parts →	2026-07-05 · Source
Roomba i6 / i6+	limited	i	Parts →	2026-07-05 · Source
Roomba i7 / i7+	limited	i	Parts →	2026-07-05 · Source
Roomba i8 / i8+	limited	i	Parts →	2026-07-05 · Source
Roomba j7 / j7+	limited	j	Parts →	2026-07-05 · Source
Roomba j9 / j9+	active	j	Parts →	2026-07-05 · Source
Roomba s9 / s9+	limited	s	Parts →	2026-07-05 · Source
Roomba Combo j7+	limited	j	Parts →	2026-07-05 · Source
Roomba Combo j9+	active	j	Parts →	2026-07-05 · Source

Models resolved from the series chips above. Support status comes from our EOL library; rows link to the matching parts and firmware pages.

Sources

Verification

OFFICIAL SOURCE COMMUNITY-VERIFIED

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

Corrections

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