I canīt find your exact model number (the 13 is throwing me off) but the fault code I have for a similar unit, with operation 5 flashes (0.5sec /5 sec off) and timer 0.1sec on/0.1sec off is Outdoor control unit abnormality. Could be anything really in the outdoor unit. Have a look and see if there are any more LEDS on the outdoor PCB.