JLG R6 - Manual (Page 83)

SECTION 5 - GENERAL SPECIFICATIONS AND MAINTENANCE
3121684 – JLG Lift – 5-23
4-2 Thermal Limit (SOA)
DTC FAULT MESSAGE DESCRIPTION CHECK
421 POWER MODULE TOO HOT - PLEASE
WAIT The power module has reached thermal cut-
out. • Power down and allow to cool.
• Do not operate in ambients over 140° F (60° C).
Refer problem to a qualified JLG mechanic.
422 DRIVING AT CUTBACK - POWER MOD-
ULE CURRENT LIMIT The drive portion of the power module has
reached thermal limit. Refer problem to a qualified JLG mechanic.
423 LIFT UP AT CUTBACK - POWER MODULE
CURRENT LIMIT The lift up portion of the power module has
reached thermal limit. Refer problem to a qualified JLG mechanic.
4-4 Battery Supply
DTC FAULT MESSAGE DESCRIPTION CHECK
441 BATTERY VOLTAGE TOO LOW - SYSTEM
SHUTDOWN A problem has been detected with the batter-
ies or power module. • Recharge batteries or check for damaged batteries.
• Check battery charger function.
Refer problem to a qualified JLG mechanic.
442 BATTERY VOLTAGE TOO HIGH - SYSTEM
SHUTDOWN A problem has been detected with the batter-
ies or power module. • May be due to improper battery charging or incorrect voltage batteries being
used.
Refer problem to a qualified JLG mechanic.
446
4421
4422
LOGIC SUPPLY VOLTAGE OUT OF RANGE The System Module logic supply voltage was
measured to be out of normal operating range.
• Check for severely discharged battery, loose cables or for damaged battery;
otherwise;
• Refer problem to a qualified JLG mechanic.