Many modern appliances contain self-diagnostic systems, much like cars. By entering a sequence of buttons or accessing a hidden menu, these machines can display error codes that pinpoint specific issues. This advancement has revolutionized troubleshooting, guiding technicians directly to the problem, thus saving time and guesswork. Fascinatingly, what once required extensive manual testing can now often be deciphered in minutes. Have you encountered an appliance with such a feature? Share your story of high-tech repair!