Fault Phenomenon: Palazzani HT29 telescopic boom aerial work platform pressing the horn produces no sound, warning function fails.

Troubleshooting Process:
– Checked horn: horn burnt.
– Checked switch: switch failed.
– Checked fuse: fuse blown.
– Checked wiring: wiring open circuit.

Root Cause: The horn is burnt or the fuse is blown.

Required Parts: Horn assembly or fuse.