Stihl Backup Power / Clock Retention Failure

Robot lawnmower occasionally loses time or date settings after being powered off.

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

Weak internal backup battery or capacitor, Main PCB aging, Frequent full power disconnections

Safety first: Ensure the mower is OFF and stable while adjusting settings.

Minimize full shutdowns: Leave the main switch ON when possible and allow the mower to rest in the docking station instead of fully powering down frequently.
Re-enter settings: After each power loss, re-enter the correct time and date and verify the mowing schedule.

Persistent loss of settings indicates a failing backup component on the main PCB, which will require PCB replacement by a service center.

Hard 4/5

Main Control PCB

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