The potentiometer or Hall effect sensor that measures pedal position is out of alignment, causing it to send a "pressed" signal even when it is not.
If the issue persists, it may be necessary to contact a certified Jungheinrich technician. Complex electrical or hydraulic problems may require specialized tools and expertise to diagnose and repair. Jungheinrich Error Code 1901
On many Jungheinrich models, error 1901 can trigger if the sensor wheel is wobbling or the gap between the sensor and the sensor wheel is too large . The potentiometer or Hall effect sensor that measures
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is almost always a temperature sensor circuit problem, not a catastrophic motor failure. By following the diagnostic steps outlined above—starting with resistance checks and harness wiggling—you will resolve 90% of cases without replacing the drive motor.
The operator is simply pushing the pedal down while turning the key.
If the pedal is physically fine, the sensor might need recalibration. This usually requires a qualified service technician to check the "neutral zone" of the throttle using Jungheinrich diagnostic tools. Related Jungheinrich Safety Codes