JLG ES series scissor lifts (1930ES, 2030ES, 2630ES, 2646ES, 3246ES)
JLG error code 423 — LIFT UP AT CUTBACK - POWER MODULE CURRENT LIMIT
Message on the display: LIFT UP AT CUTBACK - POWER MODULE CURRENT LIMIT
Code 423 occurs in machines: JLG ES series, 1932RS, 6RS, 3248RS, 10RS.
warning / function limited
The lift up portion of the power module has reached thermal limit.
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 for jammed or obstructed arm stack or pivot bushing.
- Check for excessively high current consumption in the pump, ANALYZER -> DIAGNOSTICS -> PUMP -> PUMP CUR over 130 Amps with an empty deck.
- Refer to Pump Motor Electrical Evaluation in Section 4.8.
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 423 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.