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A robot mower that stops, spins its wheels, becomes trapped, or reports No loop signal usually has one of two problems: a physical problem such as an obstacle, wet grass, debris, or a difficult slope, or a boundary problem involving the charging station, boundary wire, guide wire, installation route, or interference. Start by recording the exact alert and location, then check the station and lawn before digging up any wire. The correct repair depends on whether your mower uses a physical boundary loop or a virtual boundary system.
Start with the exact symptom, message, and location
Do not move the mower immediately and guess at the cause. Record the message shown on the mower or in its app, the point where it stopped, whether it was travelling to or from the charging station, and the charging station indicator state. Error wording differs by manufacturer. You may see No loop signal, Outside work area, Lost boundary signal, Mower trapped, or a wheel-related fault such as Slipped.
Note whether the failure is repeatable. A mower that stops in exactly the same place provides useful evidence about a local obstruction, narrow passage, slope, boundary-wire routing, or interference source. It does not prove that the wire is broken. A mower that fails throughout the yard points more strongly toward station power, a connection, a loop fault, or an electronic problem.
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- Position: mark the spot on a sketch or with a temporary outdoor marker.
- Timing: note whether the fault occurs only while mowing, only while returning, or immediately after starting.
- Conditions: record rain, dew, wet grass, mud, recent edging, construction, or a storm.
- Station indicator: write down the color or pattern, then check the model manual because LED meanings are model-specific.
These details make a support request substantially more useful and prevent you from applying a physical-wire repair to a mower that uses a virtual boundary.
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First identify the boundary system
Physical-loop mowers use a boundary wire connected to the charging station, often with a guide wire that helps the mower navigate back to the station. Virtual-boundary models define the work area through positioning hardware, a digital map, beacons, or another system; they do not have a buried or pinned perimeter wire to splice.
| What you see | Likely system | What you can inspect | What not to do |
|---|---|---|---|
| Two perimeter-wire terminals, visible wire, or a guide-wire terminal at the station | Physical loop | Station power, terminal seating, visible cable, connectors, splices, routing, and guide-wire connection | Do not assume every wire detector or connector fits every brand |
| No perimeter wire and a map, positioning setup, or digital boundary in the app | Virtual boundary | Map, positioning status, reference equipment, firmware or app instructions, and the model’s boundary-calibration procedure | Do not dig for a wire or use a loop-break method |
Check the installation and owner manuals for the exact model before lifting the mower, touching the cutting area, resetting a signal, or changing a map. The same words can describe different faults on different products.
When the mower reports No loop signal or Lost boundary signal
On a physical-loop installation, work from the station outward. A station that has lost power cannot generate a usable loop signal, and a loose connector can look like a broken cable.
1. Confirm station power and indicator state
- Make sure the station’s power supply is connected to a live outlet and that its cable is fully seated.
- Check the station indicator and compare its color or flashing pattern with the current model manual. Never interpret an LED using a different model’s chart.
- Inspect the boundary-wire and guide-wire terminals. Confirm that each wire is in the correct terminal, is clamped firmly, and has no visible corrosion or damage.
- Look around the station for a cable that has been pulled, cut, pinched, or loosened by edging, gardening, animals, or frost movement.
GARDENA’s support guidance identifies a damaged boundary wire, an incorrect station connection, and an improperly installed guide-wire connector as possible causes. EGO’s RM4000E manual likewise separates station-power faults, boundary-wire breaks, and the procedure for generating a new loop signal.
2. Inspect visible wire and known splices
Walk the accessible perimeter before excavating. Examine places where the wire emerges near the station, crosses a path, passes an edging line, or was previously repaired. A connector that is partly open or a splice exposed to moisture can interrupt the signal intermittently. Use only the wire type and repair connectors specified for your mower. A generic connector is not automatically compatible.
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3. Narrow a suspected break by dividing the loop
Husqvarna describes a manual search in which you repeatedly split the boundary loop into halves until the defective section is isolated. Disconnect and test only as the mower’s instructions permit; the terminal arrangement and test procedure differ by model. Once one half tests as the faulty section, divide that section again, continuing until you have a short area to inspect rather than digging up the entire perimeter.
A boundary-wire break detector can save time on a large installation. It is a diagnostic aid, not a universal repair system: verify that its method works with your mower’s loop and that any replacement wire and connectors meet the manufacturer’s requirements.
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4. Reconnect or repair, then follow the model’s signal procedure
After repairing a confirmed break or reseating a connector, restore the station connections exactly as shown in the installation diagram. Some models require you to generate a new loop signal after a wiring change or after the station has indicated a fault. Follow the prescribed sequence rather than repeatedly power-cycling at random.
If the station indicates a normal loop but the mower still reports signal loss, treat the problem as intermittent, location-specific, or electronic. Do not keep replacing wire without evidence.
When the fault happens in only one area
A repeatable failure in one part of the lawn can result from distance, routing, or interference. Husqvarna notes that a mower may be too far from the boundary wire in a particular location. GARDENA identifies nearby metal objects, including fences and reinforcing steel, as possible sources of interference.
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Check distance and routing
- Compare the failing location with the approved wire layout in the installation manual.
- Look for a narrow corridor, a wire run that was moved during landscaping, or an island loop that no longer follows the intended route.
- Check whether a newly installed fence, metal edging, reinforcement, or other large metal object is close to the wire.
- Observe whether the mower loses the signal only when travelling in one direction or only while cutting. That pattern can distinguish route geometry from a total loop failure.
Do not infer a universal maximum distance or clearance from another brand’s installation diagram. Boundary sensitivity and permitted layouts are model-specific.
Consider weather and electrical events
If the fault began after a thunderstorm, a surge may have affected the station or mower electronics. Complete the basic power, connector, and wire checks once. If the warning persists, stop experimenting and arrange manufacturer or authorized service; repeated resets will not repair surge-damaged electronics.
When the mower says Outside work area or crosses the boundary
An Outside work area warning means the mower believes it has left the permitted area. The cause can be a connection error, a crossed wire, an incorrectly routed island, or insufficient clearance from an obstacle or slope.
Verify station terminals and wire direction
- Confirm that the two boundary-wire ends enter the correct station terminals and are not crossed.
- Inspect each island loop around a pond, tree, bed, or other exclusion. Follow the installation diagram for the intended direction and parallel-wire arrangement.
- Check for a wire that was moved, cut, or re-pinned during edging or landscaping.
- Test the mower again in the problem area only after the routing is restored.
Use clearances only in their stated context
Husqvarna’s UK outside-work-area guidance gives a normal minimum margin of 35 cm from a slope or obstacle for the installation context described on that page. That is a Husqvarna UK recommendation, not a universal robot-mower measurement. Your model may require a different distance, a different wire layout, or a no-go area.
When it is physically stuck, slipping, or reporting a wheel fault
A mower can be perfectly connected to its boundary and still stop because it cannot move. Treat traction and obstruction faults separately from signal faults.
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Clear obstacles and material safely
- Look for toys, branches, stones, edging, exposed roots, holes, ditches, and lawn borders that catch the chassis.
- Inspect the drive wheels for grass, string, mud, or other material wrapped around an axle.
- Check the cutting disc for wound grass or debris that increases resistance.
- Examine narrow passages where the mower can turn only partly or wedge against a boundary.
Follow the model manual for stopping the mower, isolating power, and accessing the wheels or cutting disc. Do not reach under an active mower or assume that pressing a pause button alone makes the cutting mechanism safe.
Account for wet grass and dew
Wet grass, heavy dew, and mud reduce tire grip. A cited operator manual states that a Slipped fault can occur when the wheels cannot move on wet grass and recommends freeing the mower and waiting for the lawn to dry when wet grass is the cause. Worx guidance also notes that a wet lawn or significant dew can make the wheels skid. If the fault disappears after drying, improve mowing conditions or scheduling rather than changing the boundary wire.
Assess slope and route geometry
Repeated trapping on a grade, at a transition between lawn and paving, or in a narrow turn may indicate that the route exceeds the mower’s capability. Slope limits, permitted approaches, and clearance layouts vary by model and installation. Do not apply a single percentage or angle from another manual.
Reconsider the route if the mower repeatedly reaches the same ditch, edge, ramp, or tight corner. A small change to the boundary or a defined exclusion may solve the problem, but only if it follows the manufacturer’s layout rules.
Distinguish a terrain problem from a mechanical fault
If the mower slips only on wet ground or at one obstacle, correct the condition and retest. If a wheel remains immobile on dry, clear, level ground, or a wheel or motor warning recurs after cleaning, arrange service. Continued operation can turn a minor obstruction into a motor or drivetrain failure.
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Choosing the right diagnostic or repair approach
| Situation | Best first action | Advantages | Limitations |
|---|---|---|---|
| Station has an abnormal indicator or no power | Check outlet, supply cable, station connections, and model-specific LED meaning | Fast and does not disturb the installation | Cannot locate a hidden break |
| Visible cut, loose connector, or known splice | Repair with specified wire and compatible connector | Usually the smallest repair area | Requires confirmation that the part is approved for the mower |
| Signal fault with no visible damage on a large loop | Divide the loop into halves or use a compatible wire-break detector | Narrows the search without excavating the whole perimeter | Manual steps and detector compatibility are model-specific |
| Fault occurs near metal, a new fence, or one location | Inspect routing, distance, and possible interference | Addresses an environmental cause | A local failure does not prove interference or a break |
| Virtual-boundary mower | Use the manufacturer’s map, positioning, and recalibration procedure | Matches the system that defines the boundary | Physical-loop tests and wire detectors do not apply |
| Wheel slip or repeated trapping | Clear debris, wait for dry grass, and assess route and slope | Targets the physical cause | Does not fix a failed motor, wheel sensor, or electronics |
A complete troubleshooting sequence
Use this order so that low-risk checks come before excavation or service.
- Write down the exact alert, model, location, weather, and station indicator.
- Identify whether the mower uses a physical loop or a virtual boundary.
- If it is physically stuck, stop it safely and remove obstacles or material from the wheels and cutting area according to the manual.
- If the alert concerns the boundary, verify station power and inspect the boundary and guide-wire terminals.
- Inspect visible cable, accessible splices, island loops, and areas recently disturbed by gardening or construction.
- For a physical loop with no visible cause, use the model’s half-loop search or a compatible detector.
- Repair the confirmed section with specified wire and connectors, then perform the model’s loop-signal reset or new-signal procedure if required.
- For an outside-area alert, verify terminal order, wire direction, clearances, and slope or obstacle margins from the model’s installation guide.
- Retest in the original location under dry conditions. Record whether the symptom changes.
- Escalate persistent electrical, signal, wheel, or motor faults to the manufacturer or an authorized service provider.
Preventing repeat failures
- Keep a simple drawing or photograph of the installed boundary and every splice.
- Protect accessible wire and connectors from edging tools, digging, animals, and water ingress.
- Recheck the route after landscaping, installing a fence, adding metal edging, or changing a path.
- Keep the charging station powered and positioned exactly as specified by the installation guide.
- Schedule mowing when the lawn is dry if your model reports wheel slip in dew or wet grass.
- Remove toys, branches, stones, and other temporary obstacles before a scheduled run.
- Do not place exclusion loops, narrow corridors, or slope transitions by copying another brand’s diagram.
- Keep the current owner and installation manuals available; error labels, LED meanings, clearances, and reset procedures change by model.
When to stop troubleshooting and get service
Contact the manufacturer’s support route or an authorized service provider when the station remains abnormal after the prescribed power and connection checks, a repaired loop still loses signal, a wheel or motor fault recurs on a clear dry surface, or a fault follows a thunderstorm. Include the model number, exact alert, station indicator state, location, weather, repairs already attempted, and whether the failure is repeatable.
Do not keep digging up the perimeter without evidence, repeatedly generate new loop signals, or substitute unapproved wire and connectors. Those actions can obscure the original fault and create a second installation problem.
The practical diagnosis
Boundary alerts require an electrical and routing check; stuck or slipping alerts require a physical inspection. Start at the charging station, use the exact message and location as evidence, and apply physical-loop tests only to physical-loop mowers. A visible connector or wire fault can often be isolated and repaired, while a local signal loss may instead reflect distance or interference. Wet grass, debris, obstacles, narrow routes, and model-specific slope limits explain many movement failures. If the prescribed checks do not identify the cause, professional service is safer than guessing.
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