JLG ES series scissor lifts (1930ES, 2030ES, 2630ES, 2646ES, 3246ES)
JLG error code 231 — FUNCTION PROBLEM - LIFT PERMANENTLY SELECTED
Message on the display: FUNCTION PROBLEM - LIFT PERMANENTLY SELECTED
Code 231 occurs in machines: JLG ES series, 1932RS, 6RS, 3248RS, 10RS, 4045R, R4045.
warning / function limited
The ground control box lift switch was closed up or down, during power-up in ground mode.
Description from the JLG service manual, in the original wording.
Possible causes
The manual does not list the causes for this code: the service technician establishes them during diagnosis of the machine.
Checks from the manual
- Check if the lift switch is obstructed or jammed.
- Check the lift switch signal and wiring to the ground board. The lift switch input (24V) is from ground board terminal J2-4, and its outputs (24V when closed) are to ground board terminals J2-6, J2-7 (up and down).
- Replace ground board.
What service does
A qualified service technician reads the code with the manufacturer's diagnostic tools, finds the cause, clears the code and carries out a function test.
Source: JLG Service and Maintenance Manual, ES series (Diagnostic Trouble Codes section).
The descriptions are quoted from the manufacturer's service documentation and are for guidance only. Clearing codes, calibrations and repairs are carried out by a qualified service technician according to the manual for the specific serial number. A machine with an active blocking code must not be used until the cause has been removed.
Does code 231 not go away?
RK Rental services JLG lifts at our workshop or on site at the customer's premises (construction site, factory, warehouse). We read the code, remove the cause and select the parts by serial number.