Fault Phenomenon: SANY SAP125C paver when using ultrasonic leveling, the screed moves up and down unexpectedly.

Troubleshooting Process:
– Checked probe: probe surface contaminated with mud or water droplets.
– Checked reference: reference wire has debris.
– Checked angle: excessive probe installation angle deviation.
– Checked interference: strong acoustic interference nearby.

Root Cause: Water droplets or mud on the ultrasonic sensor probe surface cause confusion in the reflected sound waves, leading to incorrect height judgment by the system.

Required Parts: Clean sensor probe surface.