Robot Mower Safety Checklist

Robot Mowers  · 

Children, pets and a moving cutting disc

A robot mower cuts with pivoting blades spinning under a deck, and it moves on its own schedule. Lift and tilt sensors stop the disc when the body is raised, and most machines push out of a bump and continue in another direction, so a child or a pet standing in the path is an obstacle, not an awareness test. Set the schedule to daylight hours when the garden is normally empty, enable the PIN or app lock so nobody can start a run from the panel, and teach children that the mower is machinery and never a ride-on toy. Keep pets indoors or behind a closed gate during a run until they have learned to ignore it, and keep spare blades and the battery out of reach in storage.

Lifting, carrying and blade-stop behaviour

Before you lift the machine, stop it from the panel or app and wait for the disc to stop spinning; the lift sensor is a backup, not the plan. Check that behaviour when you take delivery and again at the start of each season: lift the back of the body clear of the ground and confirm the blades stop within a moment or two. Carry the mower by its body or handles, not by the deck or the wheel arches, and never reach under a deck that could still be turning. Wear gloves when swapping blades, disconnect or remove the battery before servicing the underside, and test the stop button the way you would test a smoke alarm.

Rain, lightning and the charging dock

An outdoor ingress rating means the machine survives weather, not that it should be cutting through a downpour. Running on soaked turf costs traction and turf health as much as it risks the electronics, so use the rain sensor or a weather-aware schedule and let the grass drain. Thunderstorms are a different matter: stop the schedule, power the dock down at the socket or unplug the transformer, and leave the machine docked and switched off until the storm has passed. An outdoor socket feeding the dock should have residual-current protection, and a surge protector on the supply is cheap insurance for the electronics in the dock and the mower.

Inspecting charging contacts and the low-voltage lead

Charging contacts carry real current in damp conditions, so they deserve a look rather than a glance. Wipe the pins or plates on the dock and the matching pads on the mower, and check for pitting, a dull grey film, green corrosion or blackened heat marks. Never bridge the contacts with a tool or a piece of wire to check the supply. Trace the low-voltage cable for nicks, crushed sections and cracked insulation where it leaves the dock, keep the connector out of standing water, and clear leaves and clippings from the dock apron so the mower can park squarely. A swollen battery should be taken out of service rather than charged again.

Routing the boundary wire near utilities and irrigation

Before any wire goes into the ground, establish what is already buried. Water and irrigation lines, electrical conduit, gas runs, drainage and fibre all sit at similar depths, and a spade through them turns an afternoon job into a repair bill. Locate services first, then keep the loop clear of mains cable runs where induction can disturb the signal. Irrigation is the most common casualty because sprinkler lines follow the same bed edges the wire does. Peg the wire rather than bury it where layout may change, seal every splice with a waterproof connector, and leave slack at corners so frost movement does not tension the run.

Slopes, drop-offs and water edges

Every machine has a published slope limit, and it applies to dry, firm turf with grip available. Wet grass reduces traction, so treat a limit reached on the flat as optimistic on a bank. Climbing ability is usually better than lateral stability, which means crossing a slope is the riskier move and the reason a mower slides sideways into a bed or a drop. Give a retaining wall or a pond edge a physical barrier as well as a wire offset, because a sliding machine does not stop at a signal. Measure your steepest section honestly before buying, and remember the limit is a maximum, not a comfortable working angle.

Bystanders during mapping and manual driving

The first mapping run, or any manual drive from the app, puts the machine under direct control at mowing speed. Keep children, pets and visitors clear of the lawn while that happens, and do not walk alongside the mower to watch it, since a person in the path triggers a turn you did not intend. Show everyone in the household where the stop button and the app stop control are, and agree that only adults run manual sessions. If the machine is being carried between zones, switch it off first rather than lifting a live mower over a fence.

Storing and charging the battery away from flammables

Robotic mowers run on lithium packs, which should be charged and stored clear of anything that burns easily. Keep the dock and charging area away from petrol cans, solvents, paint thinners, stacked cardboard, dry hay and piles of leaves, and avoid charging on a wooden bench packed with clutter. A concrete or paved floor with ventilation around the machine is a better home than a crowded timber shed. Store a spare pack at a moderate temperature rather than in a freezing outbuilding or a hot loft, stop using a pack that is swollen, dented or unusually warm after charging, and make sure the space where the mower lives has a working smoke alarm.

FAQ

Does the blade stop when I pick the mower up?

A lift or tilt sensor should cut power to the blade disc when the body is raised, and it works quickly on most machines. It is a backup safety device, though, not a substitute for stopping the mower from the panel and waiting for the disc to spin down before you lift it or reach underneath.

Can a robot mower run in the rain?

It can survive weather within its ingress rating, but running on saturated grass risks traction loss, ruts and rucked clippings more than it risks the electronics. Use the rain sensor or a weather-aware schedule, and stop the machine entirely during thunderstorms rather than relying on its enclosure.

Where must the charging dock never be placed?

Not where it can sit in standing water, not on a slope the mower has to climb to park, and not where the low-voltage lead has to be extended with a domestic extension cable. It also belongs away from petrol, solvents and dry leaves, since the battery charges there.

How close to a pond or retaining wall can a robot mower run?

Close enough to cut up to the edge, but the wire alone is not protection on a drop. Leave a wire offset plus a physical barrier such as a low kerb or planted strip, because a mower that loses traction on wet grass can slide past the signal boundary.