0458-725-8621-B
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23 Troubleshooting Guide
23.1 Trimmer / Brushcutter
23 Troubleshooting Guide
Always remove the connecting cord before carrying out any inspection, cleaning or maintenance.
Condition LEDs on 
Battery
Cause Remedy
Trimmer / 
Brushcutter does not 
start when switched 
on.
No electrical contact 
between trimmer / 
brushcutter and 
battery.
► Remove the connecting cord, @ 14.2.
► Visually check the electrical contacts in the socket.
► Reinsert the connecting cord, @ 14.1.
► If the trimmer/brushcutter still does not start, clean the 
contact surfaces on the connecting cord, @ 21.2.
1 LED flashes 
green.
STIHL AR only: 
Additionally, 
four long beeps 
are emitted.
Battery has low 
charge.
► Charge the battery as described in its instruction manual.
1 LED glows 
red.
Battery too hot / too 
cold.
► Allow the battery to warm up or cool down gradually at 
ambient temperatures of about 50°F to 68°F (10°C to 
20°C).
4 LEDs flash 
red.
STIHL AR only: 
Additionally, a 
rapid 
succession of 
short beeps is 
emitted.
Malfunction in 
battery.
► Remove and reinsert the connecting cord, @ 14.
► Switch on the trimmer / brushcutter, @ 15.1.
► If the LEDs continue to flash, do not attempt to use.
The battery has a malfunction and must be replaced.
3 LEDs glow 
red.
Trimmer / 
Brushcutter too hot.
► Allow the trimmer / brushcutter to cool down.
3 LEDs flash 
red.
Malfunction in 
trimmer / 
brushcutter.
► Remove and reinsert the connecting cord, @ 14.
► Switch on the trimmer / brushcutter, @ 15.1.
► If the LEDs still flash, do not attempt to use.
The trimmer / brushcutter has a malfunction and must be 
checked by a servicing dealer.