Symptom - Husqvarna Automower 420 Technical Manual

6.2 Symptom

The most commonly occurring symptoms are described below. All symptoms are grouped by the situation
where they occur most often.
1. Cutting
2. Searching
3. Following the guide wire
4. Docking
5. Charging
6. Others
6.2.1 Symptoms during mowing
Table 5: Symptoms during mowing
Symptom
Uneven mowing result
The robotic lawnmower
runs at the wrong time
The robotic lawnmower
vibrates
The mower mows for
shorter periods than usual
between charges
Both the mowing and
charging times are shorter
than usual
6. TROUBLESHOOTING
Cause
The robotic lawnmower works
too few hours per day.
Working area too large.
Dull blades.
Long grass in relation to the set
cutting height.
Incorrect lawn coverage settings. Check the lawn coverage settings and
Does not follow the guide wire to
the areas specified.
Accumulation of grass by the
blade disc or around the motor
shaft.
The robotic lawnmower clock
needs to be set.
The start and stop times for
mowing are incorrect.
Damaged blade on blade disc
Wrong number of blades on the
blade disc creates an imbalance.
Grass or a foreign object is
blocking the blade disc or
wheels. The cause may also be
impaired battery capacity.
Impaired battery capacity.
Action
Increase the working hours.
Try to limit the working area or extend the
working time.
Replace all the blades and screws so that
the rotating parts are balanced.
Increase the cutting height and then lower
successively.
optimize them for the installation. See the
Operator's Manual.
Check guide signal, see 6.4 Troubleshooting
the loop signal on page 95, plus settings
to follow the guide cable.
Check that the blade disc rotates freely and
easily. If not, the blade disc may need to
be removed and grass and foreign objects
removed.
Set the clock. See the Operator's Manual.
Adjust the start and stop time setting for
mowing. See the Operator's Manual.
Inspect the blades and screws and replace
them if necessary.
Make sure there are no blades missing or
that more than one blade is mounted on the
same screw.
Remove and clean the blade disc. Perform
a battery test to determine the battery's
capacity. Refer to 6.6 Battery test on
page 98.
Perform a battery test to determine the
battery's capacity, see 6.6 Battery test on
page 98.
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