A Trane Intellipak unit display says "HI COMMUNICATION FAILURE - CHECK INTERPROCESSOR COMM LINK".
The manual just says the Human Interface has lost communication with the RTU module. My question is how to diagnose exactly what the problem is. There are a number of boards. I cannot swap parts! This is a freestanding unit. The unit will reset with a power down reset and run for quite a while. When booting the screen says 6200-0047-02
Multiforum post due to urgency