Fault Symptom, General - Husqvarna Automower Technical Manual

6. Trouble shooting

6.2 Fault symptom, General

Table 12: Fault symptom, General
Symptom
Uneven mowing results
The Automower works at
the wrong time.
The Automower vibrates
Automower runs, but the
blade disc does not rotate
The mower mows for
shorter periods than usual
between charges
Both the mowing and
charging times are shorter
than usual
Automower runs at an
angle or in an arc.
Automower runs in a small
circle or one of the wheels
locks when turning
instead of rotating
backwards.
The Automower reaches
the F-field, but does not
interpret the N-signal.
124 Automower from
Cause
The Automower works too few hours per
day.
Working area too large.
Dull blades.
Long grass in relation to the set cutting
height.
Accumulation of grass by the blade disc
or around the motor shaft.
The clock on the Automower needs to be
set.
The start and stop times for mowing are
incorrect.
Unbalanced blade disc or damaged
blades.
Automower is searching for the charging
station.
Grass or a foreign object is blocking the
blade disc or skid plate.
This behaviour is normal in high
temperatures (gradually increasing
above 25 °C).
The tilt sensor is calibrated incorrectly.
The mower believes it is climbing a slope
and tries to compensate for this.
The tilt sensor is defective.
The wheel motor's gearbox is slipping.
The charging plate (N-coil) is defective.
™
Action
Increase the working hours.
Try to limit the working area or extend the working
time.
Replace all the blade units so that the rotating parts
are balanced.
Increase the cutting height and then successively
lower.
Check that the skid plate and the blade disc rotate
freely and easily in relation to each other. If not, the
skid plate and perhaps the blade disc must be
removed and the grass and foreign objects removed.
Set the clock.
Adjust the start and stop time setting for mowing. The
battery in the control box may need to be replaced,
see page 112.
Inspect the blade and screws and replace them if
necessary.
No action The blade disc does not rotate when the
mower is searching for the charging station.
Dismantle and clean the skid plate and blade disc.
No action.
Calibrate the tilt sensor by selecting Tools - Special
settings - Calibrate tilt sensor (shortcut 5-6-3)
Replace the control box, see page 108 about
replacement.
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.
Replace the wheel motor when faulty, see page 115
about replacement.
Check the N-signal from the charging station: Place
the Automower in the test position and then check
the value via the Quick check function (Press and
hold the 0 key down for 2 seconds). The N-coil is
defective if the value for N is lower than 100. The
charging plate must be replaced.