ROOMBA·FAULT ERR 23 CRITICAL

Roomba Error 23 — Battery not communicating

Q: Roomba Error 23 — Battery not communicating

Error 23 means the robot can't talk to its battery — the pack never initialized when charging began. Aftermarket batteries are the usual suspect. Reseat the battery; if the error survives a reboot, replace the pack.

Severity: Critical — robot won't charge or run until the battery link is restored eis

Last verified: 2026-07-05 Tools: none Time: ~10 min Difficulty: moderate

DIRECT ANSWER

Error 23 means the robot can't talk to its battery — the pack never initialized when charging began. Aftermarket batteries are the usual suspect. Reseat the battery; if the error survives a reboot, replace the pack.

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COMMON CAUSES · RANKED

Aftermarket or counterfeit battery MOST COMMON

Clone packs often skip the authentication chip iRobot firmware expects, so the handshake fails.

Battery seated loosely

A pack that shifted after a bump or a previous battery swap loses its data connection.

Failed battery electronics UNCOMMON

The pack's internal board can die even when the cells still hold charge.

HOW TO FIX IT

SAFETY · READ THIS FIRST

Power off and remove the battery before touching its contacts; never pry at a swollen or damaged pack.

Power off and reseat the battery

Remove the battery, wait ten seconds, and reinstall it firmly. Put the robot back on the dock.

Verify the battery is genuine

Check for iRobot branding and part markings on the pack. Clone batteries trigger this error routinely.

Reboot the robot

Hold CLEAN until the light ring swirls, let it boot, and start a charge.

Replace the battery

If a genuine, reseated pack still won't talk after a reboot, the pack is done — fit a new original battery.

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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.

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.

Check price on Amazon ↗

Sources

Verification

OFFICIAL SOURCE

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

Corrections

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