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Seat belt or belt lock not closed. The truck may inhibit travel until the belt is buckled.
These codes typically point to issues with the battery, fuses, or the main contactor.
Drive pedal activated while the parking brake is still engaged.
Overvoltage. Often caused by an incorrect battery or a faulty controller; travel and hydraulics may be inhibited to prevent damage.
These codes often require technical inspection of the wiring and internal components. Jungheinrich Forklift Truck Fault Codes DTC.pdf