Robot mower keeps getting stuck: causes and fixes

Start by finding the pattern

Before changing anything, record where and when the mower gets stuck. Many apps show the position or a run history; otherwise, put a cane in the ground each time you find it stopped. After a few days, you will usually see clusters: by a particular tree, at the edge of a path, on one slope, or only after rain. Each cluster points to a specific fix.

Clean the mower at the same time. Clogged wheels with packed clippings and mud lose grip, and worn tyre treads slip on damp grass. Brush out the wheels and underside before blaming the lawn.

Note:Press the stop button and switch off or disable the mower with the PIN before freeing it, cleaning it or turning it over. Never lift or tip a robot while the blades are running, and wear gloves near the blades. Follow the manual.

Common causes and fixes

This table covers the causes that account for most stuck messages. Several can appear in the same garden, so work through each cluster you found.

Ruts, roots and low edges

Robots follow similar routes near the dock and along guide wires, which can wear tracks into soft lawns. Many models let you vary the exit corridor or the distance from the guide wire, which spreads the wear; check your manual. Fill existing ruts with a sandy topsoil, firm lightly and overseed in spring or early autumn, which the RHS lists as the best times for lawn repairs.

Exposed roots and molehills catch the blade disc or lift a wheel. Top dress around shallow roots or place the boundary to keep the mower off the worst patch. Low edges are a classic trap: if a path or border sits several centimetres below the lawn, a wheel drops over and spins. Either raise the path or edging to lawn level, or move the boundary further in to the distance your manual gives for a drop.

Wire-free models can use virtual no-go zones in the app for the same job, which makes small adjustments quick.

Slopes, hills and wet grass

Every robot has a maximum slope rating, usually given as a percentage. A 35% slope is about 19 degrees and a 45% slope is about 24 degrees. Ratings assume dry grass and good traction, so slopes near the limit become a problem after rain. Banks next to a boundary are hardest, because the mower must turn on the slope.

Turn on rain delay if your mower has it, or schedule cutting for drier parts of the day. Some makers sell spiked or studded wheels for extra grip on slopes, so check what fits your model. If a bank is beyond the rating, exclude it and cut it by hand. For hilly gardens, our robot mowers for slopes guide lists models with higher ratings, such as all wheel drive options.

Narrow passages and small garden layouts

Small gardens often have tight gaps between a bed and a fence or a path between front and back lawns. Wired mowers need a minimum passage width so they can cross without mistaking one side of the wire for the other; the figure varies by model, so check the manual. Some models offer a corridor or passage setting to handle these.

If a gap is too narrow, widen it slightly, lay stepping stones flush with the lawn, or split the lawn into separate zones. Compact models with narrow bodies usually cope better, and our robot mowers for small gardens guide covers models with small passage figures. Our problems and fixes guide covers other faults.

• Keep stepping stones and paths flush with the lawn
• Round off sharp corners in the boundary
• Avoid loose gravel next to the cutting area
• Tuck hoses and cables away before runs

See robot mowers for small gardens →

Frequently asked questions

Why does my robot lawn mower keep getting stuck in the same place? That spot has a specific problem: a dip, a root, a low edge or a slope that gets slippery when wet. Level it, move the boundary or add a no-go zone.

Can robot lawn mowers handle hills? Yes, within their stated slope rating, given in percent. Choose a model rated comfortably above your steepest slope, and remember wet grass reduces grip.

Do spiked wheels help a robot mower on slopes? Some makers sell traction wheels or studs for exactly this. Use only parts approved for your model, and fit them as the manual describes.

Should I stop the mower running when the lawn is wet? On slopes and soft ground, yes. A rain sensor or rain delay setting helps reduce ruts and stuck messages.