Husqvarna LC 551 iV - 7.2 Troubleshooting: Error Code Diagnosis

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