Fault Phenomenon: Genie S-45 telescopic boom aerial work platform operating the lift handle, the platform does not respond, engine RPM normal.

Troubleshooting Process:
– Checked load sensor: no overload alarm.
– Checked hydraulic oil level: level normal.
– Checked proportional valve: proportional valve coil has no power.
– Checked emergency stop button: button reset.

Root Cause: The lift enable switch inside the platform control box has poor contact, preventing signal transmission.

Required Parts: Platform control handle assembly or enable switch.