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20 Troubleshooting
Fault
LEDs on the
battery
4 LEDs flash
red.
The lawn mower
3 LEDs illumi‐
stops during ope‐
nate red.
ration.
The lawn mower
vibrates excessi‐
vely during ope‐
ration.
The lawn mower
operating time is
too short.
The battery gets
stuck when fitting
0478-131-9862-B
Cause
There is a fault in the
battery.
The electrical connec‐
tion between the lawn
mower and battery
has been interrupted.
The lawn mower or
battery is damp.
The resistance at the
blade is too great.
The area around the
blade is blocked.
The lawn mower is
too warm.
The blade is blocked. ► Pull out the activation key.
There is an electrical
fault.
The blade fastening
screw is loose.
The blade is not cor‐
rectly balanced.
The battery is not fully
charged.
The battery service
life has been excee‐
ded.
The area around the
blade is blocked.
The blade is blunt or
worn.
The resistance at the
blade is too great.
The guides or electric
contacts in the battery
Remedy
► Allow the lawn mower to cool down.
► Remove the battery and fit it again.
► Switch the lawn mower on.
► If 4 LEDs still flash red: do not use the
battery and consult a STIHL specialist
dealer.
► Pull out the activation key.
► Remove the battery.
► Clean the electric contacts in the battery
compartment.
► Insert the activation key.
► Fit the battery.
► Pull out the activation key.
► Remove the battery.
► Clean the lawn mower.
► Allow the lawn mower or battery to dry.
► Set a higher cutting height.
► Switch the lawn mower on in lower
grass.
► Clean the lawn mower.
► Pull out the activation key.
► Remove the battery.
► Allow the lawn mower to cool down.
► Clean the lawn mower.
► Do not switch the lawn mower on too fre‐
quently within a short time.
► Set a higher cutting height.
► Mow shorter grass.
► Remove the battery.
► Clean the lawn mower.
► Remove the battery and fit it again.
► Switch the lawn mower on.
► Tighten the screw.
► Sharpen and balance the blade.
► Fully charge the battery.
► Replace the battery.
► Clean the lawn mower.
► Sharpen and balance the blade.
► Set a higher cutting height.
► Mow shorter grass.
► Clean the lawn mower.
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