English
Fault
LEDs on the
battery
3 LEDs illumi‐
nate red.
4 LEDs flash
red.
Self-propulsion is
not working.
The lawn mower
3 LEDs illumi‐
stops during
nate red.
operation.
The lawn mower
vibrates exces‐
sively during
operation.
The lawn mower
operating time is
too short.
20
Cause
The lawn mower is
too warm.
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.
There is a fault in the
self-propulsion mech‐
anism.
The lawn mower is
too warm.
The blade is blocked. ► Remove the battery.
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.
Remedy
► If 3 LEDs still flash red: do not use the
lawn mower and consult a STIHL spe‐
cialist dealer.
► Remove the battery.
► 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.
► Remove the battery.
► Clean the electrical contacts in both bat‐
tery compartments.
► Fit the battery.
► Remove the battery.
► Clean the lawn mower.
► Allow the lawn mower or battery to dry,
21.5.
► Set a higher cutting height.
► Switch the lawn mower on in lower
grass.
► Remove the battery and fit it again.
► Engage self-propulsion.
► If the self-propulsion fault persists: con‐
sult a STIHL specialist dealer.
► 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.
► If working with self-propulsion engaged:
set a lower speed.
► If working with self-propulsion disen‐
gaged: go forwards slower.
► Set a higher cutting height.
► Mow shorter grass.
► 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 as described in
the STIHL charger operating instruc‐
tions.
► Replace the battery.
► Clean the lawn mower.
► Sharpen and balance the blade.
20 Troubleshooting
0478-131-9980-A