122
Thermo King
Warning
Check Diesel/Electric Circuit
Error when attempting to switch between diesel and electric mode or vice versa.
Possible causes
- Stuck or defective transfer relay
- Electric motor contactor fails to engage
- Standby signal detection failure
- Mechanical lock in the clutch solenoid
Recommended actions
- Test operation of power contactors
- Verify control signals on the interface module
- Check high voltage fuses
- Ensure diesel or electric motor rotates freely
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