Liebherr Fault Code
Free · no signupE437
Drilling Assistant Interruption.
System
Control (Litronic)
Symptom
Drilling Assistant Interruption.
Diagnosis & fix steps
LOGIC: Abnormal signal from the Lower Proximity Sensor (B40 series).
ACTION: Perform a "Tug Test" on the sensor cable. These cables are highly exposed to drill cuttings; look for "sheared" insulation near the leader base.
Red Seal field insights
RED SEAL FIX: If the sensor is clean but failing, check the LED on the sensor tail. If it’s ON but the monitor says OFF, the signal wire is broken inside the harness.
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