F6E2=COMMUNICATION ERROR UI TO CCU
Communication between Central Control Unit (CCU) and User Interface (UI) has not been detected.
• Verify continuity in cable between CCU (UI7) and UI (C2). See wiring diagram on page 22.
• Check AC and DC supplies. See TEST #1 (CCU Power Check) on page 13.
• See TEST #2 (User Interface) on page 14.
This is the newer design that uses the Capacitive Touch User Interface (UI). I will attach the Training Pointer on that too, it tells you how to access it.