Husqvarna Automower 420 Workshop Manual page 50

Messages
Number Message
INTERNAL DIAGNOSTICS
49 Problem with ultrason-
ic
69 Alarm! Mower shut
down
70 Alarm! Mower stopped Alarm activated as the product has
71 Alarm! Mower lifted
72 Alarm! Mower tilted
74 Alarm! Mower outside
Geofence
77 Connection problems
501 Electronics problem
502 Electronics problem
503 Electronics problem
504 Electronics problem
50 - Troubleshooting
Cause
The ultrasonic sensors are faulty.
The ultrasonic circuit board is faulty.
Alarm has been activated as the prod-
uct is shut down.
been stopped.
Alarm activated as the product has
been lifted
Alarm activated as the product has
been tilted
Alarm activated as the product was
moved outside the Geofence area.
Problem with the Automower
module.
Communication problems between the
HMI circuit board and main circuit
board
HMI circuit board memory problem
Keypad problem
Display problem
Action
Replace the ultrasonic sensors. Refer
To replace the ultrasonic sensors
to
450X/450XH/550/550H on page 30 .
Replace the ultrasonic circuit board.
Adapt the security level of the product
Security menu .
in the
®
connect Restart the product. If the fault persists,
To replace the communication
refer to
circuit board, 420/440 only as accesso-
ry on page 29 .
Restart the product by switching off the
ON/OFF button, wait 10 seconds and
then switch on the ON/OFF button.
Make sure the cable between the HMI
circuit board and main circuit board is
connected properly. Check also that
the cable is not damaged, pinched, or
that the connector is not damaged.
Replace the HMI circuit board. Refer to
To replace the HMI circuit board on
page 29 .
Replace the main circuit board. Refer
To replace the main circuit board on
to
page 28 .
Replace the HMI circuit board.
Make sure the cable between the HMI
circuit board and the keypad is properly
connected.
Replace the keypad. Refer to
place the keypad 420/430X/430XH/
440/450X/450XH on page 23 .
Replace the HMI circuit board.
Replace the HMI circuit board.
To re-
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