AL-KO robot mower displays E7 and stops with the front bumper pressed in.

Safety first: Turn off the main switch and wait for all movement to stop before touching the bumper area.

• Release bumper: Gently pull and push the front bumper. It should move freely and return to its neutral position. Remove any trapped branches, stones, or turf.
• Clean bumper guides: Use a brush to remove grass and dirt from the bumper slides and springs.
• Inspect springs: Check that the bumper return springs are intact and not broken or detached. Reattach if they have slipped off their hooks.
• Check collision switches: Remove the front cover to access the collision sensor switches or strip. Ensure they are firmly mounted and that the actuator from the bumper reaches them.
• Verify wiring: Inspect the cable from the collision sensor to the main PCB. Reseat the connector and look for pin damage.
• Test operation: Reassemble, power on, and gently press the bumper by hand while the mower is in test mode (if available). If E7 persists, replace the collision sensor assembly.