Husqvarna Automower 420 Technical Manual page 94

6.2.4 Symptoms during charging
Table 8: Symptoms during charging
Symptom
Both the mowing and
charging times are
shorter than usual
The mower never leaves
the charging station
6.2.5 Miscellaneous symptoms
Table 9: Miscellaneous symptoms
Symptom
The display's backlighting
is lit but operating the
keypad and the main
switch does not produce
any reaction
The display shows the
Loading program text
The display flashes
or shows incorrect
information.
The display background
lighting is on but pressing
the keyboard does not
produce a reaction
English - 94
6. TROUBLESHOOTING 6. TROUBLESHOOTING
Cause
Impaired battery capacity.
PARK mode activated.
TIMER settings are preventing
the mower from leaving the
charging station.
The mower never becomes fully
charged.
Power supply faulty.
Cause
The main circuit board is faulty.
The HMI circuit board is blocked.
The HMI circuit board is blocked.
Faulty microswitch (for STOP
button) and/or faulty keypad.
Action
Perform a battery test to determine the
battery's capacity. Refer to 6.6 Battery test
on page 98.
Press the START button and select Main
area or Secondary area.
Check TIMER settings. Also check that the
clock shows the current time.
Check that the mower is receiving the
charging power. Check that the value for
Current agrees with the guide values in
section 1.13 Battery on page 16. If there
is no, or too low charge current, grind off
any deposits on the charging strips on
the mower and the contact strips in the
charging station. Use an emery cloth and
lubricate with a copper paste Also check
that the cabling in the charging station and
to the mower's charging strip is correctly
connected and that they are not damaged.
Check that the mower is receiving the
charging power. Check that the value for
Current agrees with the guide values in
section 1.13 Battery on page 16.
Action
Reprogram the main circuit board using
Autocheck EXP. Refer to
4.3.4 Programming on page 49.
Program the mower using Autocheck EXP.
Program the mower using Autocheck EXP.
Check the functioning of the microswitch
and the keypad. Replace faulty parts.