Troubleshooting Thermo King APU Control Box – No Power Issue

The Thermo King APU Control Box is an essential component of the Thermo King TriPac APU system. It controls various functions of the APU, including the fan kick on/off, power distribution, and overall system operation. However, there may be instances where the control box experiences a power failure, resulting in the APU not functioning properly. In this article, we will discuss the possible causes and steps to troubleshoot and fix the Thermo King APU Control Box’s no power issue.

Possible Causes:

  1. Faulty Camp Controller: The camp controller, located inside the APU control box, may be malfunctioning, causing a power failure.
  2. Blown Fuse: A blown fuse inside the control box can disrupt the power supply to the APU system.
  3. Wiring Issues: Loose or damaged wiring connections can prevent the control box from receiving power.

Troubleshooting Steps:

  1. Check the Reset Button: Locate the reset button on the main computer for the APU, usually located under the bunk. Press the reset button to see if it resolves the power issue. If not, proceed to the next step.
  2. Inspect the Fuses: Use a number two screwdriver to remove the four screws securing the top of the control box. Once the top is removed, examine the row of fuses on the bottom. Look for any blown fuses, indicated by a broken filament inside the fuse. Replace any blown fuses with the appropriate rating.
  3. Check the Camp Controller: Inside the control box, locate the camp controller. Inspect it for any signs of damage or malfunction. If the camp controller appears faulty, it may need to be replaced.
  4. Verify Wiring Connections: Ensure all wiring connections inside the control box are secure and free from damage. Tighten any loose connections and repair or replace any damaged wiring.
  5. Test the APU: After performing the above steps, reassemble the control box by securing the top with the screws. Plug in the control box and listen for any sounds indicating power flow. If the APU starts functioning correctly, the power issue should be resolved.

The Thermo King APU Control Box is a critical component of the TriPac APU system. When experiencing a no power issue, it is essential to troubleshoot and identify the root cause to restore proper functionality. By following the steps outlined in this article, you can effectively diagnose and fix the Thermo King APU Control Box’s no power issue, ensuring your APU operates smoothly and efficiently.

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