Many modern appliances possess an onboard diagnostic system, akin to a car's OBD-II. When these appliances run into issues, they can display error codes that pinpoint the exact cause of the malfunction. However, what's less known is that by pressing a combination of buttons, you can sometimes access a hidden service menu that provides detailed errors, history, and sensor data—information normally reserved for technicians. This feature can turn a guessing game into a precise repair strategy. Did you know this, or have you discovered other appliance secrets? Share your insights!