Fujitsu AOY30TMBDL. Error Code E:01 = Communication between indoor/outdoor unit. Found T3.15a Fuse blown on outdoor pcb. Board looked knackered and burnt so replaced board. Plugged one thing back in at a time on board and powered up. Last thing to plug back in was the transformer, power up and pop goes 3.15a pcb fuse. I unplugged both connections from tranny to pcb, replaced fuse on pcb and power on - no popped fuse. I plug in the 2 purple leads from tranny into pbc and power on - no popped fuse. Once the other plug from the tranny is plugged into board the fuse pops, suggesting tranny is at fault. I have tried 2 other known to be ok trannys, and the fuse keeps blowing! Any ideas anyone? Many thanks in advance...............