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 18-21 — Proportion Al Relief Valve — Fault
Message on the display: Proportion Al Relief Valve — Fault
Code 18-21 occurs in machines: Genie Z-60 DC, S-60 DC, Z-45 DC, Z-45 FE.
warning / function limited
The Genie display shows code 18-21 with the message “Proportion Al Relief Valve — Fault”. It is a warning: some functions of the machine may be limited until the cause has been removed.
Effect on the machine: Warning: Will cause poor operating efficiency
Possible causes
- Open or short circuit
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
Verify no open/short circuit across C28-2 RRDCON, C1-6, C3-3 (V191PCE WH/RD)
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 18-21 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
Neighbouring Genie codes
- 17-26AUX PUMP _ Auxiliary Pump — RESISTANCE TOO LOW
- 18-12Proportional Relief Valve — VALUE TOO HIGH
- 18-16Proportional Relief Valve — VALUE AT 0V
- 19-27Aux Pump Toggle Switch — Active at startup
- 20-11Primary Extend/Retract Joystick Rocker — Shorted to supply
- 20-16Primary Extend/Retract Joystick Rocker — Sensor at Zero