Komatsu Fault Code

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A105 / Code 105

Propulsion Cut / Inverter Fault Code

System

Electric Propulsion

Symptom

Propulsion Cut / Inverter Fault Code

Diagnosis & fix steps

LOGIC: Grid Chopper Resistor Over-Temperature Circuit Tripped. ACTION: Check thermal switch continuity on the retarder resistor grid banks. Blow metallic dust out of grid insulators and inspect grid cooling blower motor operation.

Red Seal field insights

Dust Arcing: Accumulations of airborne conductive iron ore/copper dust on the dynamic braking resistor frames cause high-voltage flashovers to chassis ground.

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