My Robot Doc

Known issue

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

Error 323 is a documented overload code, but four independent owners split into two very different outcomes: a five-minute cleaning fix, or weeks-long free warranty repair for a genuine motor fault.

From owners' reports in German, not from Mammotion's own pages.

Status Open

Models
LUBA 2 (base/2024)
First reported
07 Apr 2024
Last updated
07 Sep 2026
Affects
Robot body — not the app
LUBA 2 (base/2024)First reported 07 Apr 2024Details
Models
LUBA 2 (base/2024)
First reported
07 Apr 2024
Last updated
07 Sep 2026
Affects
Robot body — not the app

What to do next

  1. Clear the cutting deck and blades, and check what the mower just cut. Mole hills, tall wet grass and debris are the reported causes behind a temporary overload.

    More about this step

    Applies when: 323 appears after unusually long, wet or debris-heavy grass, including alongside 325, 326 or 328, which can trip together from one motor problem.

    Worked if: 323 stops recurring without anything being replaced.

    Didn't work? Next: step 2 — After a thorough clean, turn each cutting disc by hand with the...

    Method: owners on this page whose fault stopped after cleaning

  2. After a thorough clean, turn each cutting disc by hand with the disc and its guard removed. A right disc noticeably harder to turn than the left reads as a genuine motor fault rather than debris.

    Stop and get help if

    the disc will not turn freely at all: stop running the mower and treat it as a motor fault.

    More about this step

    Applies when: the code came back after cleaning, with no jam or debris found.

    Worked if: you know which of the two causes you are in, before spending weeks on a repair or a cleaning that will not work.

    Didn't work? Next: step 3 — Contact Mammotion support for a warranty repair. For reference:...

    Method: two owners who found no jam and returned the unit

  3. Contact Mammotion support for a warranty repair. For reference: one covered unit came back in about two weeks at no cost with saved maps intact, and a second was still in repair after nearly two weeks.

    More about this step

    Applies when: the disc turns hard by hand, or the fault persists after cleaning and a blade change.

    Worked if: the unit is with support, and the maps survive the repair.

    Method: this page's own outcomes and timings

On this page
  1. What to do next
  2. The code
  3. Cause 1: temporary overload from debris or wet, tall grass (cleaning fixes it)
  4. Cause 2: a genuine motor fault (needs a warranty repair)
  5. Sources
What this page is: error 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.

Sources

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