The u3 fault code appears when the self-diagnosis function fails to check the communication between the PC boards. Most likely, one of the two boards is faulty, or the wiring has gone loose or damaged. You may need to replace the failing board.
The u3 fault code appears when the self-diagnosis function fails to check the communication between the PC boards. Most likely, one of the two boards is faulty, or the wiring has gone loose or damaged. You may need to replace the failing board.