Robot mower shows E15 and stops when the cutting height is adjusted or when mowing uneven ground.

Safety first: Turn OFF the mower and wear gloves. Keep the mower on a stable, flat surface.

• Manual movement check: If your Cedrus model allows manual height adjustment, try moving the height knob or lever through its full range. It should move smoothly without binding.
• Clean mechanism: Inspect the area around the cutting deck supports and height screw for packed grass or stones. Clean thoroughly.
• Avoid extreme settings: Set the cutting height to a mid‑range position and test operation. Very low settings on bumpy lawns can overload the mechanism.
• Listen for motor: When adjusting height via the menu, listen for the height motor. No sound may indicate a failed motor or wiring; continuous straining noise suggests a jam.
• Service if needed: If E15 persists, the height adjustment motor, potentiometer, or linkage may need replacement. This typically requires partial disassembly of the deck and is best done by a technician.