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7556-VOLT LITHIUM-ION ELECTRIC ZERO TURN MOWER — ZT4200S/ZT4200S-FC
LCD
Display
Description
Fault code
on LCD
Mower
Status
Indicator
Audio
Indicator
Cause Solution
see
“Fault
code”
Left blade
motor
fails in
rotation
PCBA con-
trolled left
blade motor
fails
607 n/a One beep PCBA failure
Have repairs performed by a qualified
service technician.
Plug (Triple-
phase, power
wire) connect-
ing the left
blade motor
with the corre-
sponding PCBA
is loosened.
509 n/a One beep Loose connection
Inspect the blade firstly. If it is loos-
ened, use a 9/16 in (14 mm) torque
wrench to tighten the bolt clockwise.
The recommended torque for the
blade bolt is 36-41 ft-lb (50-55 Nm).
Otherwise, have repairs performed by
a qualified service technician.
Left blade mo-
tor fails
509 n/a One beep Motor failure
see
“Fault
code”
Right
blade
motor
fails in
rotation
PCBA con-
trolled right
blade motor
fails
507 n/a One beep PCBA failure
Have repairs performed by a qualified
service technician.
Plug (Triple-
phase, power
wire) connect-
ing the right
blade motor
with the corre-
sponding PCBA
is loosened.
609 n/a One beep Loose connection
Inspect the blade firstly. If it is loos-
ened, use a 9/16 in (14 mm) torque
wrench to tighten the bolt clockwise.
The recommended torque for the
blade bolt is 36-41 ft-lb (50-55 Nm).
Otherwise, have repairs performed by
a qualified service technician.
Right blade
motor fails
609 n/a One beep Motor failure
see
“Fault
code”
Accelerator pedal fails
311/411
OFF One beep
PCBA failure
Have repairs performed by a qualified
service technician.
307/407 Loose connection
see
“Fault
code”
Steering wheel fails 312/412 OFF One beep
PCBA failure
Have repairs performed by a qualified
service technician.
Loose connection
see
“Fault
code”
Parking
brake
fails, the
mower
cannot be
driven.
Parking brake
PCBA, which
is in the front
frame assem-
bly, is broken.
309/409 OFF One beep PCBA failure
Have repairs performed by a qualified
service technician.
Parking brake
switch and/or
wire is broken.
801 OFF One beep
Wire/Switch
failure
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