Stihl No Power / Dead Unit

Robot lawnmower does not start at all; display is blank and mower appears completely dead.

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Safety Warning

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.

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Possible Causes

Disconnected or failed power supply to docking station, Faulty docking station, Deeply discharged or failed battery pack, Defective main control PCB

How to Fix / Troubleshooting

Safety first: Disconnect the docking station from mains before handling cables.

  • Check mains outlet: Plug another device into the same outlet to confirm it has power. Reset any tripped breakers or RCDs.
  • Inspect power supply: Verify that the external power supply for the docking station shows a status LED (if equipped). Check the low-voltage cable for damage.
  • Test docking station: With power connected, check the docking station LED. If it is off or flashing abnormally, consult the manual; the base may be faulty.
  • Wake the mower: Place the mower in the docking station, ensure proper contact, and leave it for at least 1–2 hours to charge a deeply discharged battery. Then try switching it ON.

If the mower remains completely unresponsive with a known-good docking station and power supply, the battery pack or main PCB is likely defective and should be replaced by an authorized Stihl service center.

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Repair Difficulty

Hard 4/5

Required Part

Power Supply / Battery Pack
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