Hello,
PROBLEM 37
Display = "F5", no lift truck operation, line contactor closes and opens.
POSSIBLE CAUSE
Faulty wire connections; DTR1 failed; Current limit set to low; Failed DD1
or DD2; Failed driver board; Failed current sensor; Failed logics.
CHECKS
Disconnect the following wires, visually inspect them for burnt or discolored terminals; Loose
connections; Smashed or compressed connectors; Corrosion or foreign material. Wire #L65 at P9-1.
Wire #L64 at P9-5 and emitter bus bar of left drive power transistors. Wire #L67 and #L68 at resistor
DR1. Wires #L63 at DTR1. Wire #4 from driver board to positive heatsink. Wire #1 from driver board to
negative heatsink. Wire #L22 from logics P1-12 to current sensor. Wire #25 from logics P1-16 to current
sensor. Current sensor PIN3 to negative heatsink. Repair any defects then reconnect the wires.

hello, do you know what the error code was? I have a truck with the same code.