Troubleshooting Thermo King APU Shutdown and Yellow Triangle Error Due to Faulty Controller

Thermo King APUs are essential components in trucks that provide auxiliary power and climate control. However, like any other mechanical system, they can encounter issues that require troubleshooting. One common problem is the APU shutting down and displaying a yellow triangle error, which can be attributed to a faulty controller. In this article, we will explore the causes of this issue and discuss potential solutions.

Identifying the Problem:
In a video demonstration, it was observed that moving a specific knob on the controller caused the APU to make proper contact and prevented the AC from turning off. However, when the knob was not in the correct position, the APU would shut down, accompanied by a yellow triangle error. This indicates a problem with the controller.

To resolve the issue, the video suggests using a product called DeoxIT D5, which is designed to remove oxidation and improve connections. The process involves spraying the DeoxIT D5 onto the knob to remove any oxidation that may be hindering proper contact. After applying the solution, the controller is reassembled, and the APU is turned on to check if the problem persists.

Testing the Solution:
After applying the DeoxIT D5 and reassembling the controller, the APU is turned on and monitored for a period of time to ensure that it does not shut down and the yellow triangle error does not reappear. In the video, the APU ran for 20 minutes without any issues, indicating that the solution was successful.

Additional Recommendations:
The video also provides a link in the description for purchasing the DeoxIT D5 solution if viewers wish to try the same method. It is important to note that this solution may not work for all cases of APU shutdown and yellow triangle errors. If the problem persists after attempting this fix, it is advisable to consult a professional technician or contact Thermo King customer support for further assistance.

The Thermo King APU shutting down and displaying a yellow triangle error due to a faulty controller can be a frustrating issue for truck owners. However, by using products like DeoxIT D5 to remove oxidation and improve connections, it is possible to resolve the problem and prevent further shutdowns. It is always recommended to follow proper troubleshooting procedures and seek professional help if needed to ensure the APU operates efficiently and reliably.

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