Bosch Collision Bumper Not Working (No Code)

Robot mower does not detect obstacles and collides hard with trees or walls

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Bumper jammed, Broken bumper springs, Disconnected collision sensor, Worn bumper guides

Safety: Turn OFF the mower before inspection.

Test bumper movement: Manually press the bumper in various spots; it should move and spring back freely.
Clean around bumper: Remove grass, mud, or debris from the bumper gap.
Inspect for damage: Look for broken plastic mounts or missing springs.
Service sensor: If the bumper moves but impacts are not detected, the internal collision sensor switch or wiring may need replacement.

Medium 3/5

Bumper / Collision Sensor Assembly

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