13 Ways to Test Gree Mini Split AC Circuit Board To Fix U5 Error!

If your Gree Mini Split AC or air conditioner is showing a U5 error, this detailed repair guide will help you fix it step by step. In this video, we thoroughly test the Gree mini split AC PCB and circuit using 13 proven diagnostic methods to determine whether the board is functioning correctly or has a hidden fault. The U5 error often indicates an AC current detection circuit malfunction, but the real issue can lie deeper within the PCB and related circuitry. You'll learn how to check AC and DC voltages across essential components such as capacitors, rectifiers, resistors, fuses, optocouplers, and the IPM module. A faulty resistor (R901) was found to be the true cause behind the voltage instability and U5 fault. The entire testing and repair process is shown in real time with accurate multimeter readings and clear explanations. Whether you're a technician or a hands-on DIYer, this video is your complete guide to understanding and fixing mini split AC circuit and PCB problems. Subscribe for more air conditioner repair tutorials and electronics troubleshooting tips.

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