Troubleshooting Schedule - Husqvarna LC 551 iV Workshop Manual

7.2 Troubleshooting schedule

Problem Possible cause
The warning indicator shows
the error code 2: Cutting mo-
tor phase connection is de-
fective or missing.
The warning indicator shows
the error code 3: There is too
high current in the cutting
motor.
The warning indicator shows
the error code 4: Cutting mo-
tor MOSFET failure or short
circuit.
The warning indicator shows
the error code 7: Drive motor
MOSFET failure or short cir-
The prod-
cuit.
uct does
not start,
the warn-
The warning indicator shows
ing indica-
the error code 8: Low voltage
tor flash-
alarm.
es.
The warning indicator shows
the error code 9: Battery
shutdown alarm. Connection
problem between the product
and the battery.
The warning indicator shows
the error code 11: Problem
with the connection between
the primary control and the
handlebar control.
The warning indicator shows
the error code 19: Connec-
tion alarm for the battery
pack in battery box 1.
The warning indicator shows
the error code 20: Connec-
tion alarm for the battery
pack in battery box 2.
34 - Troubleshooting
Step Troubleshooting
Make sure that the cutting motor is instal-
led correctly and that the phase cables are
1 not defective.
Make sure that the blade is not blocked
and that it can rotate freely. WARNING:
Remove the safety key from the safety lock
1
and put it in the safety key holder. Remove
the battery and wait a minimum of 5 sec-
onds before you touch the blade!
There is too high current in the transmis-
1
sion.
If the primary control MOSFET is out of or-
2
der, no troubleshooting is possible.
There is too high current in the transmis-
1 sion.
If the primary control MOSFET is out of or-
2
der, no troubleshooting possible.
The battery is out of power.
1
Do a check of the white wire between bat-
tery 1 and the power switch panel. Do a
1 check of the green wire between battery 2
and the power switch panel.
Do a visual inspection of the wires between
1 the primary control and the motor control
box.
Do a visual inspection of the wires between
2 the motor control box and the control pan-
el.
Connection problems between the product
and the battery. Do a check of the yellow
1
wire between battery 1 and the primary
control panel.
Connection problems between the product
and the battery. Do a check of the yellow
1
wire between battery 2 and the primary
control panel.
To do
Connect the phase
cables correctly or
replace the cutting
motor if it is defec-
tive.
Make sure that the
blade rotates freely,
replace the blade
or the blade sup-
port if it is defective.
Replace the cutting
motor if it is defec-
tive.
Replace the control
unit if it is defective.
Replace the trans-
mission if it is de-
fective.
Replace the control
unit if it is defective.
Charge the battery.
Replace the battery
box if it is defective.
Connect the wires
correctly or replace
defective wires.
Connect the wires
correctly or replace
defective wires.
Replace the wires
to the batteries or
the primary control
panel.
Replace the wires
to the batteries or
the primary control
panel.
1292 - 001 -