JLG R6 - Manual (Page 88)

SECTION 5 - GENERAL SPECIFICATIONS AND MAINTENANCE
5-28 – JLG Lift – 3121684
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POWER MODULE FAILURE - INTERNAL
ERROR A problem has been detected with the power
module. Cycle machine power on /off a few times if this doesn’t clear the DTC,
refer problem to a qualified JLG mechanic.
9-9 Hardware
DTC FAULT MESSAGE DESCRIPTION CHECK