Preview — not yet launched. MyRobotDoc is online early so owners and reviewers can read it. Pages are still being checked against their sources, so details may change.

My Robot Doc

Independent guides for robot mower owners

Not affiliated with or endorsed by any device manufacturer. All trademarks belong to their respective owners.

← All guides

known-issue

LUBA 2: cutting-motor overload (323) — cleaning fixes it for some, others need a warranty repair

Models covered
LUBA 2 (base/2024)
Affects
Robot body — not the app
First reported
7 April 2024
Last updated
7 September 2026
Status
Open

Robot body — not the app. See our app vs. firmware vs. RTK guide if you're not sure which one you're dealing with.

What this page is: fault 323 ("right cutting-disk motor is overloaded") is already documented in Mammotion's manual: see the fault-codes reference for the official fix text. What the manual doesn't tell you is that owners report two genuinely different causes behind the same code, with very different next steps. Four independent LUBA 2 owners hit this in the same thread: here's how to tell which situation you're in.

The code

323 ("Überlastung des rechten Schneidmotors" / right cutting-disk motor is overloaded) is an officially documented fault. Related codes from the same motor — 325 (fails to start), 326 (overheating), and 328 (sensor failure) — came up alongside 323 for more than one owner in the same thread, suggesting a single underlying motor problem can trip several of these codes together1.

Cause 1: temporary overload from debris or wet, tall grass — cleaning fixes it

"Überlastung des rechten Schneidmotors" recurred repeatedly, traced to mole hills and tall, wet grass rather than a hardware fault; the fault stopped recurring after cleaning the cutting deck1. If your mower has just cut through unusually long, wet, or debris-heavy grass, clear the cutting deck and blades before assuming anything is broken.

Cause 2: a genuine motor fault — needs a warranty repair

The identical 323 code turned up with no jam or debris found in two other cases, with the right cutting-disc turning noticeably harder by hand than the left one even after removing the disc and its guard for inspection1. Both owners sent the unit in under warranty:

  • One owner's unit was repaired and returned within about two weeks (sent April 11, delivered back April 24), at no cost, with all saved maps intact; no re-mapping was needed after reconnecting it in the app1.
  • A second owner's repair was still in progress with no status update after nearly two weeks in transit/repair, as of the last post in the capture1.

A similar noise and an intermittent fault code (first the right motor, then the left) persisted after cleaning and a blade replacement for a fourth owner, with no resolution recorded at the time of the capture1.

If you're seeing 323 (or 325/326/328): first clear the cutting deck and check for mole hills, tall wet grass, or debris around the blades: several owners' faults cleared after a simple cleaning. If the cutting disc still turns noticeably harder by hand than the other side after a thorough clean, that reads as a genuine motor fault rather than debris. Contact Mammotion support for a warranty repair; based on these reports, turnaround has run from about two weeks to longer, and covered units come back at no cost with saved maps intact. Let us know what you find, especially your outcome and timeline.
Advertisement

Sources