JLG M600 Service Manual - Manual (Page 184)

SECTION 6 - JLG CONTROL SYSTEM
6-18 – JLG Lift – 3121813
3/3 Flash code 3/3 indicates that a contactor coil is short-circuit.
OVERLOADED VALVE SUPPLY-CHECK WIRING
There is a high current draw from the valve supply when no valve is energized; this is probably due to a wiring error at the ground
module.
SHORT-CIRCUIT FORWARD CONTACTOR COIL
The forward contactor was not energized when required, due to coil overcurrent protection.
SHORT-CIRCUIT LINE CONTACTOR COIL
The line contactor was not energized when required, due to coil overcurrent protection.
SHORT-CIRCUIT REVERSE CONTACTOR COIL
The reverse contactor was not energized when required, due to coil overcurrent protection.
3/5 Flash code 3/5 indicates that there is a brake pressure problem.
BRAKES DID NOT LOCK
Brake pressure did not clear when the brake valve was deenergized.
BRAKES DID NOT RELEASE
No brake pressure was detected when running the pump motor and energizing the brake valve and steer speed valve.
4/2 Flash code 4/2 indicates that the controller is overtemperature.
SYSTEM TOO HOT - PLEASE WAIT
The controller heatsink temperature reached 75 degrees. The controller is shut down until it cools to below 70 degrees.
4/4 Flash code 4/4 indicates problems with the battery supply.
BATTERY LOW
Battery voltage is below 40V. This is a warning - the controller does not shut down.
BATTERY TOO HIGH - SYSTEM SHUT DOWN
Battery voltage is above 62V.
EMS recycle required.
BATTERY TOO LOW - SYSTEM SHUT DOWN
Battery voltage is below 33V.
EMS recycle required.
Table 6-5. Help Descriptions and Fault Flash Codes