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

Can't find your code? Talk to an expert

$150

One-on-one phone session with a Low Temp refrigeration tech. Emergency temporary assistance only.

Have a question? Ask the community

Thousands of refrigeration mechanics read and answer for free. Post your case in under 1 minute.

Need a professional diagnosis?

Low Temp Service — refrigeration experts in Florida.

Contact us