ROBOROCK·FAULT ERR 12 INFO

Roborock Error 12 — Low battery

Q: Roborock Error 12 — Low battery

Error 12 means the battery is too low to start cleaning. This is a protective refusal, not a fault. Put the robot on the dock, let it charge, and it will start normally.

Severity: Info — nothing is broken — the robot just needs a charge before it will start S5S6S7S8Q

Last verified: 2026-07-05 Tools: none Time: ~2 min Difficulty: easy

DIRECT ANSWER

Error 12 means the battery is too low to start cleaning. This is a protective refusal, not a fault. Put the robot on the dock, let it charge, and it will start normally.

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

COMMON CAUSES · RANKED

Robot didn't finish charging MOST COMMON

A clean was started right after a long job, before the battery recovered.

Robot sat off the dock for weeks

The battery self-discharges in storage. A robot parked under the sofa for a month wakes up empty.

Dock not actually charging UNCOMMON

Dirty contacts or an unplugged dock leave the robot draining while it looks docked.

HOW TO FIX IT

No battery or electrical work involved in this fix.

Dock the robot

Place it on the charging dock and confirm the indicator shows charging.

Let it reach a working charge

Scheduled cleans only start above 20% battery, so give it time.

Check the dock if it never charges

No charging light means dirty contacts or dock power trouble — that is Error 13 territory.

Did this fix your robot?

No reports yet for this fix — be the first.

COMPATIBLE PARTS

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Lithium-ion battery — S5

Power the robot off and remove the bottom screws to reach the pack; buy from a reputable seller, since no-name cells are a fire risk.

Check price on Amazon ↗

RELATED FIRMWARE

S5 series (S5)

SAMPLE DATA — dataset in progress

3.3.9_0017683.5.4_0019103.5.7_0020083.5.8_0020203.5.8_002034

Firmware timelines are rebuilt monthly from release notes. Versions marked as sample data are community-reported and not yet verified. Full firmware timeline →

Sources

Verification

OFFICIAL SOURCE

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

Corrections

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