Choose your fault below to see common causes and solutions.
Head blocked with grass or debris
Unplug trimmer and clean cutting area.
Line tangled on reel
Unplug trimmer, carefully unravel line and refit.
Contact a qualified repairer.
Check mains flex, plug fuse and wiring, and mains outlet for faults.
Disconnect from mains and contact a qualified repairer.
Check flex and plug for damage. If all is in order, reset RCD. If it trips again, unplug trimmer and contact a qualified repairer.