Komatsu Fault Code
Free · no signupEvent 200 / F-02
Dynamic Retarding Dead / Overheat Alert
System
Electric Propulsion
Symptom
Dynamic Retarding Dead / Overheat Alert
Diagnosis & fix steps
LOGIC: Dynamic Retarding Grid Blower Motor Current Below Normal.
ACTION: Inspect DC grid blower motor brushes and commutator face. Verify chopper circuit IGBT gate drive signals and measure grid resistor bank isolation resistance.
Red Seal field insights
Thermal Hazard: Without active blower cooling air across the dynamic retarding resistor grid, electrical braking is inhibited to prevent melting the resistor grid elements.
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