Genie DC and FE electric boom lifts (Z-60 DC, S-60 DC, Z-45 DC, Z-45 FE, Z-33/18 DC)
Genie error code 139-21 — Left Rear Drive Controller — Fault
Message on the display: Left Rear Drive Controller — Fault
Code 139-21 occurs in machines: Genie Z-33/18 DC.
blocking fault
The Genie display shows code 139-21 with the message “Left Rear Drive Controller — Fault”. It is a blocking fault or a safety-related code: do not use the machine until the cause has been found and removed.
Effect on the machine: Functions disabled or limited per AC motor controller internal fault handling.
Possible causes
- Internal fault not mapped to a specific Genie fault code has occurred
What you can do
Switch the machine off with the emergency stop and switch it on again. If the code comes back, do not use the machine and call service.
Solution from the manual
Refer to MOTOR CONTROLLER FAULT CODES screen on platform display and MOTOR CONTROLLER FAULT CODE CHART in service manual.
Source: Genie Service and Repair Manuals (Part No. 1307785, 1299608, 1297714, 1271125, 1268514), Fault 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 139-21 not go away?
RK Rental services Genie 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.
Genie service · Genie parts · All Genie codes of this system