Robot mower displays E11 and stops on a slope or uneven terrain.

Safety first: Turn OFF the mower before moving it. Avoid working on steep slopes.

• Check slope angle: Verify that the area where the mower stops does not exceed the maximum slope specified in the Honda manual. Relocate the boundary wire to avoid overly steep sections.
• Inspect wheels and traction: Worn drive wheels can slip and cause excessive tilt. Replace wheels if the tread is heavily worn.
• Check sensor mount: Open the housing and locate the incline/tilt sensor. Ensure it is firmly mounted in the correct orientation and has not shifted.
• Reset and test: Power cycle the mower and test on a flat area. If E11 appears even on level ground, the sensor may be faulty.

Persistent E11 on level ground usually requires replacement of the tilt/incline sensor module and, if needed, recalibration using Honda diagnostic tools.