Liebherr Fault Code
Free · no signup0x0318
Hydraulic Oil Temp High / Fan at Low RPM
System
Cooling / Thermal
Symptom
Hydraulic Oil Temp High / Fan at Low RPM
Diagnosis & fix steps
LOGIC: Hydraulic Oil Cooler Demand Fan Proportional Solenoid Open Circuit.
ACTION: Measure proportional valve coil resistance on hydraulic fan drive manifold (~22Ω). Trace 2-conductor cable running along upper carriage frame to Litronic output board +4A1-A2.
Red Seal field insights
Inverted Fan Logic: An open circuit drops variable pump swashplate to minimum displacement on this circuit, reducing fan airflow and resulting in rapid hydraulic oil thermal derate.
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