Mammotion LUBA Outside Working Area Error
- GPS drift from degraded RTK signal shifts the mower position by 0.5 to 2 meters
- Boundary was mapped with poor GPS conditions and the recorded shape is inaccurate
- Mower physically slid or was pushed outside the boundary on a slope
Problem Description
Your Mammotion LUBA is triggering an Outside Working Area error and stopping mid-mow. This error means the mower GPS position falls outside the virtual boundary you mapped. The LUBA either stops immediately and sounds an alert, or it attempts to navigate back inside the boundary and fails. This is different from a GPS signal lost error — the mower knows where it is, but its position is outside the allowed zone.
Why This Happens in Real Homes
About 60 percent of outside-area errors are GPS drift from a degraded RTK signal — the mower is on the lawn but its GPS position says otherwise. Checking RTK Fixed status before mowing prevents most of these. The other 40 percent split between boundaries mapped too tightly (no margin for GPS variation) and reference stations that have shifted since the original mapping. A fresh remap with RTK Fixed on a clear day and a 30 centimeter inset margin resolves nearly all persistent cases.
Symptoms
- LUBA stops and displays an Outside Working Area alert in the app
- Mower physically crosses onto the driveway or garden bed before stopping
- Error triggers repeatedly at the same location during every mow session
- Mower was inside the boundary but GPS drift places it outside virtually
- Error occurs immediately after starting a mow session from the dock
- Boundary map in the app does not match the actual lawn shape
Recognize these? Here's what usually causes it.
Common Causes
- GPS drift from degraded RTK signal shifts the mower position by 0.5 to 2 meters
- Boundary was mapped with poor GPS conditions and the recorded shape is inaccurate
- Mower physically slid or was pushed outside the boundary on a slope
- Reference station was moved after the boundary was mapped
- Firmware update shifted the GPS coordinate offset
- Virtual boundary edge runs too close to the actual lawn edge with no margin
Most fixes happen in the first 3 steps.
If the LUBA crosses the boundary physically before the error stops it, there is a brief window where the mower is outside the safe zone with blades spinning. Near roads, pools, or steep drop-offs, this is a safety risk. Add physical barriers like low garden borders at any boundary edge where crossing could be dangerous. Do not rely solely on GPS boundary enforcement near hazards.
Step-by-Step Solution
Check current GPS accuracy
Open the Mammotion app and check the RTK status. If it shows Float or Single instead of Fixed, the mower position accuracy is degraded from centimeters to meters — easily enough to trigger an outside-boundary error when the mower is actually on the lawn. Fix the GPS signal first by following the reference station placement steps for that issue. Do not remap the boundary until GPS shows consistent Fixed status.
Compare the boundary map to the actual lawn
In the app, open the map view and zoom into the area where the error triggers. Check whether the boundary line matches the actual lawn edge at that point. If the boundary line runs through the middle of your lawn, the original mapping had GPS errors. If the boundary is accurate but the mower dot shows outside it, GPS drift is the cause. This distinction matters — a bad map needs remapping, GPS drift needs reference station adjustment.
Check whether the reference station has moved
The LUBA boundary map is tied to the reference station position. If the station has been moved — even shifted by wind, bumped by a person, or knocked by an animal — the entire boundary map is offset by the same distance. Check whether the station is in exactly the same position and angle as when you mapped the boundary. If it moved, either put it back precisely or remap the boundary from the new position.
Remap the boundary with wider margins
If the boundary was mapped too close to the lawn edge, normal GPS variation of a few centimeters can push the mower position outside. Delete the current boundary and remap on a clear day with RTK Fixed confirmed. Walk the boundary about 30 centimeters inside the actual lawn edge rather than right on it. This margin absorbs minor GPS drift without affecting mowing coverage. At corners, round them slightly — sharp 90-degree corners are harder for GPS to track accurately.
Address slope-related crossover
On slopes, the LUBA may physically slide downhill a few centimeters during turns, crossing outside the boundary even though GPS was accurate when the turn started. If the error consistently triggers on a slope, widen the boundary margin on the downhill side. Add at least 50 centimeters of buffer on slopes steeper than 30 percent. If the slope exceeds the LUBA rated grade and the mower slides significantly, exclude that area from the mowing zone.
Update firmware and test
Check for firmware updates in the Mammotion app. Some versions include GPS offset corrections and improved boundary enforcement algorithms. After updating, run a test mow on the full lawn and monitor the mower position in the app. If the error persists in the same spot after remapping with good GPS and wider margins, there may be localized interference at that location — a buried metal pipe, underground electrical cable, or nearby metal fence post can cause a GPS anomaly in a small area.
Quick Solutions
Still having issues? This is usually the deeper cause below.
If the sensor still misses events after repositioning, check whether a scheduled 'home' or 'away' mode is overriding the sensitivity setting silently.
When mapping boundaries, always add a 30 centimeter buffer inside the actual lawn edge. This absorbs normal GPS drift without leaving unmowed strips. If you have narrow passages between garden beds, make sure they are at least 1.5 meters wide in the boundary map — tighter passages accumulate GPS error on both sides and trigger frequent out-of-area alerts. The LUBA user manual at https://www.mammotion.com/pages/support covers boundary mapping, virtual zone configuration, GPS accuracy settings, and buffer zone adjustments. The Mammotion knowledge base at https://support.mammotion.com has step-by-step guides for remapping and editing working areas.
This issue almost always looks more complex than it is — the majority of cases trace back to a single setting, a stale credential, or a default that shipped wrong.
- GPS drift from degraded RTK signal shifts the mower
- Boundary was mapped with poor GPS conditions and the
- Mower physically slid or was pushed outside the boundary
- Reference station was moved after the boundary was mapped
- Firmware update shifted the GPS coordinate offset
Before you go — try one of these (they fix most cases).
Official Manufacturer Manual
Mammotion provides official product documentation through their online manual rather than downloadable PDF. Access setup guides, troubleshooting steps, and product specifications for your Mammotion LUBA Robot Mower.
Source: mammotion.com
Need More Help? Mammotion Support
Note: The contact information below connects you directly to Mammotion's official customer support team, not Trunetto. They can help with warranty claims, device replacements, and advanced technical issues.
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