No Communication

Communication lost between controller modules

Watchdog Timeout

Controller watchdog timer expired - processor fault

EEPROM Data Error

Controller memory data corrupted or invalid

EEPROM Failure

Controller EEPROM memory chip failure

Contactor Closed Fault

Main contactor stuck in closed position at startup

Contactor Open Fault

Main contactor failed to close when commanded

Brake Not Closed

Electromagnetic brake failed to engage

Brake Contactor Open

Brake release contactor failed to operate

Main Contactor Closed

Main power contactor stuck closed unexpectedly

Main Contactor Open

Main power contactor failed to close

High Field Current

Motor field winding current exceeds safe limit

No Field Current

Motor field winding not receiving current

High Temperature

Controller or motor temperature exceeds limit

Thermal Protection Active

Thermal cutback engaged to protect components

Motor Temperature High

Drive motor overheating

Battery Low

Battery voltage critically low

Battery Warning Level 2

Battery voltage below warning threshold

Battery Warning Level 1

Battery voltage approaching low threshold

Current Sensor Error

Motor current sensor malfunction or out of range

Driver Shorted

Power stage driver circuit short detected

Contactor Driver Fault

Contactor driver circuit failure

Coil Shorted

Contactor or solenoid coil short circuit

Coil Interrupted

Contactor or solenoid coil open circuit

Accelerator Not OK

Accelerator pedal signal out of valid range

Incorrect Start

Invalid startup sequence - safety interlock triggered

Forward + Reverse

Both forward and reverse simultaneously selected

Encoder Error

Motor speed encoder signal invalid

Pedal Wire Fault

Accelerator pedal wiring fault detected

Pedal Failure

Accelerator pedal potentiometer failure

Traction Motor Brushes

Traction motor brushes worn or damaged