Another issue is that any wiring diagram or schematic is subject to copyright so no one should be publishing them on the Internet anyway. As far as I know there are no official repair manuals and schematics for UK washing machines and other appliances readily available.
Once the washing machine is turned on the wires become active and then there is no place for mistakes. Washing machines have become an indispensable house hold product. Taking care of it is important for our easy and manageable day to day life. Understanding your washer and its error signs is important to provide it timely care.