20 years ago Maytag made one type of washing machine (and many wish they still made that model today). In fact they made the same machine for over 50 years. Whirlpool only had one model washer also as did all the other major manufacturers. Now you have a choice of no fewer than five distinct washing machines from Maytag alone. You can get their agitator model top load, large OR super capacity agitator-less top load, or the large OR ridiculously large front load washer. We also have Asko, Bosch, Fisher & Paykel, Miele, Haier, Electrolux, Samsung, and LG to mention a few that never existed or weren’t available in the USA. The sophistication of design, number of available consumer options and complexity surrounding diagnosis and repair has also increased dramatically. A typical single electric wall oven contained a selector switch and a thermostat in order to control oven bake and broil functions. Now you could have a separate electronic control for bake and broil, separate relays plus a touch pad membrane to send commands to those gadgets. The diagnostic flow chart, fault code list, schematic, and wiring diagram are all necessary in making a thorough, accurate diagnosis and repair. Check out the picture I’ve attached to this post. It is of a Viking electric double wall oven. The unit contains four electronic control boards, six relays, a membrane switch and lots of wires connecting them all together.