Genie Z-40/23N, Z-40/23N RJ and Z-33/18: machine control
Genie error code 57-21 — Tach L — Fault
Message on the display: Tach L — Fault
Code 57-21 occurs in machines: Genie Z-33/18 DC.
blocking fault
MOTOR Left side AC drive motor encoder.
Description from the Genie service manual, in the original wording.
Effect on the machine: Drive function disabled.
Possible causes
The manual does not list the causes for this code: the service technician establishes them during diagnosis of the machine.
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
Check wiring at the 6 wire deutsch plug at the drive motor. Check for 12V DC on pins 1 and 2. Replace encoder. Replace left (slave) AC motor controller.
Source: Genie Service and Repair Manuals (Part No. 119817, 1268528, 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 57-21 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.
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