Fault Phenomenon: EP ES12 electric pallet truck when operating the handle, the vehicle accelerates or moves in reverse on its own, unable to control precisely.

Troubleshooting Process:
– Checked handle potentiometer: potentiometer resistance jumps.
– Checked controller parameters: incorrect parameter settings.
– Checked wiring harness ground: poor grounding.
– Checked handle mechanical structure: return spring broken.

Root Cause: Wear of the handle speed potentiometer causes signal drift.

Required Parts: Handle potentiometer or handle assembly.