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The contactor tips may be welded together or mechanically jammed in the "ON" position. Wiring Faults:
Ensure battery terminals are clean and the truck is fully charged. jungheinrich error code 0802
Look for loose, broken, or corroded wires near the mast or main controllers. The contactor tips may be welded together or
If your system uses a pre-charge resistor connected across the main contactor studs, verify it is not burned out. A failed pre-charge resistor causes massive arcing every time the contactor closes, drastically shortening the life of the new contactor. If your system uses a pre-charge resistor connected
Jungheinrich’s diagnostic process is well‑documented, and service centers have access to the latest firmware and component databases.
Understanding why code 0802 appears requires looking at the accelerator pedal’s electronic architecture. Most Jungheinrich trucks use a or dual potentiometer inside the pedal assembly. The controller expects a specific voltage range—typically 0.5V (idle) to 4.5V (full throttle). Code 0802 arises when:
Visually inspect the hydraulic manifold for any loose connections. When to Call a Professional