Husqvarna Automower Technical Manual page 123

Table 11: Fault messages
Fault message
Left wheel motor blocked
Right wheel motor blocked
Left wheel drive system
defect
Right wheel drive system
defect
Blade motor drive defect
Blade disc blocked
Cause
The Automower has jammed.
Grass or other object may have become
wrapped around the drive wheel.
The wheel motor is defective.
The control box is defective.
The wheel motor is defective.
The control box is defective.
Lower section cable harness is damaged
or defective.
The blade motor is defective.
The control box is defective.
Lower section cable harness is damaged
or defective.
Grass or another object may have
become wrapped around the blade disc.
6. Trouble shooting
Action
Remove the object.
Check the drive wheel and remove the grass or other
object.
Check the function of the wheel motors when free
wheeling via Tools - Test - Power & Motors – Wheel
motors (shortcut 5-2-1-1) or with Autocheck. Check
that both wheel motors start with a force of 50 %.
Now increase the force using Arrow up to 100 %. At
100 % the speed of each wheel should be at least
45 cm/seconds. Check to make sure that the motors'
gearboxes do not slip by blocking respective wheels.
When blocked the speed should be 0 cm/second.
NOTE! When a motor does not start and is extremely
difficult to turn by hand, except from the wheel motor,
the control box may be faulty. See the cause below.
Replace the motor if defective.
Some control box faults can be discovered with the
help of the wheel motor. Rotate the wheel by hand
and note the resistance. Now remove the cabling
from the motor and rotate the wheel again. If it is
easier to rotate now, the control box is defective and
must be replaced.
Check the function of the wheel motors when free
wheeling via Tools - Test - Power and Motors –
Wheel motors (shortcut 5-2-1-1) or with Autocheck.
Check that both wheel motors start with a force of
50 %. Now increase the force using Arrow up to
100 %. At 100 % the speed of each wheel should be
at least 45 cm/seconds. Check to make sure that the
motors' gearboxes do not slip by blocking respective
wheels. When blocked the speed should be
0 cm/second. NOTE! When a motor does not start
and is extremely difficult to turn by hand, except from
the wheel motor, the control box may be faulty. See
the cause above. Replace the motor if defective.
Replace the control box.
Check the cable harness and connector and check
whether there is a repairable defect. If not; replace
the cable harness.
Check that the blade motor runs at the right speed
via Tools - Test - Power & Motors – Blade motor
(shortcut 5-2-1-2). The speed should be about
2,500 rpm.
Replace the control box.
Check the cable harness and connector and check to
see whether there is a repairable defect. If not;
replace the cable harness.
Check the blade disc and remove the grass or other
object.
Automower from 123
™