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Robot Lawn Mower Not Working? Fixes (2026)
Common robot lawn mower problems and fixes: boundary wire breaks, stuck on slopes, poor cut quality, and app connection issues.
Most robot mower problems trace to four causes: the boundary wire, the blades, the wheels, or the schedule. Work through these fixes in order before assuming the mower itself is broken.
Mower reports a boundary wire break and will not start
Walk the perimeter and look for recent digging, edging, or aeration that may have cut the wire. Most manuals describe a signal-tracing method using the charging station; a wire break detector tool makes this fast. Repair with waterproof wire connectors, not twisted tape, and rebury the section.
Mower gets stuck on a slope it used to climb
Check wheel tread for caked mud and grass, which kills traction. Wet conditions reduce grip significantly, so consider scheduling around rain rather than through it. If the slope is near the mower's rated maximum, reroute the boundary wire to exclude the steepest section.
Cut quality is ragged or patchy
Ragged tips mean dull blades: replace them, as robot mower blades are consumables rated in months, not years. Patchy coverage usually means the schedule is too sparse for the lawn size; increase mowing frequency or add a second daily window rather than assuming the mower is broken.
App will not connect to the mower
For Bluetooth models like the Husqvarna and Gardena, stand within 30 feet with a clear line of sight and toggle your phone's Bluetooth. For Wi-Fi models like the Worx, check that the mower is within range of the router or an extender; metal sheds and dense walls block the signal to the charging station location.
Questions, answered
Why does my mower keep stopping with an error?
Lift and tilt errors usually mean debris under the body or a wheel lifted on uneven ground. Clear the underside, check for trapped sticks, and confirm the lawn has no new holes or ruts from animals or weather.
How often should I replace the blades?
Every one to three months of active mowing season depending on lawn size and soil sandiness, which dulls blades faster. Dull blades tear rather than cut, browning the grass tips.