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22 Troubleshooting Guide
4004 – Internal fault
Press OK to release
– Error in the program sequence.
– Power failure during automatic operation.
– Robotic mower is located outside the mowing 
area.
► Check the power supply to the docking 
station.
Check the LED on the docking station. The 
LED must glow red during operation.
► Return the robotic mower to the mowing area.
► Confirm message by pressing the OK button.
4005 – Internal fault See message 4004. ► See message 4004.
4006 – Internal fault See message 4004. ► See message 4004.
4008 – Internal fault See message 4004. ► See message 4004.
4027 – STOP button 
pressed
Press OK to release
STOP button has been pressed. ► Confirm message by pressing the OK button.
Message Possible Cause Remedy