Husqvarna Automower 420 Workshop Manual page 46

Messages
Number Message
MOTORS
20/21 Wheel motor blocked,
right/left
22/23 Wheel drive problem,
right/left
35/36 Wheel motor overloa-
ded, right/left
25 Cutting system
blocked
40/42/46 - Limited cutting height
range
41 - Unexpected cutting height adj
43 - Cutting height problem, drive
44 - Cutting height problem, curr
45 - Cutting height problem, dir
46-47 Cutting height blocked
46 - Troubleshooting
Cause
Grass or other object has wrapped
around the drive wheel.
The wheel motor is faulty
The main circuit board is faulty
The cabling to the wheel motor is dam-
aged
Grass or other object has wrapped
around the drive wheel.
Grass or another object may have be-
come wrapped around the blade disc.
The blade disc is lying in a pool of wa-
ter.
The blade motor is defective.
The main circuit board is defective.
The cabling to the blade motor is dam-
aged or faulty.
The cutting height adjustment cannot
move.
The cutting height adjustment motor is
not installed correctly or faulty.
The cutting height sensor circuit board
is not installed correctly or faulty.
The cutting height adjustment has been
altered without a request from the prod-
uct.
Action
Check the drive wheel and remove any
objects.
Check the function of the wheel motors
when idling.
Replace the main circuit board. Refer
To replace the main circuit board on
to
page 28 .
Check whether the damage is repaira-
ble. Replace the wheel motor if neces-
sary.
Check the drive wheel and remove any
objects.
Check the blade disc and remove any
object.
Move the product and rectify the cause
of water collecting in the work area.
Make sure the blade motor has the
Tools - Test - Mo-
right speed. Refer to
tors on page 12 .
Replace main circuit board. Refer to
replace the main circuit board on page
28 .
Check whether the damage is repaira-
ble. Otherwise replace the blade motor.
Remove the chassis and check that the
cutting height adjustment can move.
Check all moving parts in the cutting
height system.
Check that the motor cabling is fitted
correctly. Replace the motor if required.
Check that the cutting height sensor
circuit board is installed correctly. Re-
place the board if required.
Do a cutting height calibration. Refer to
Tools - Calibrate on page 14 .
To
1191 - 001 -