Hi, we have a contract that includes many Kone elevators but this one should be easy but I have run out of ideas. I have changed pretty much ever and still can't resolve this issue. I know the fault is related to the rear side door functions. One cop, five front and one rear opening. We original issue was the rear open button not functioning and also found a broken wire on the 0/24v that goes to the Mul board in the travel cable. I only get a 1301 when I pull xc11 or cable from mul board. Yes I have changed the rif board, mul/cobs, cable from mul to ccbn, ccbn board, cpu board/chip, cpu board, checked all hoistway, turned fire service on/off, tested rear door op. Things I have noticed, the fault comes on right after hoistway communication. Elevator just relevels to the closest floor and goes out of service.
Thanks in advance.