Many appliances harbor hidden date codes within their serial numbers, which repair professionals use to determine their exact age. This knowledge is crucial when assessing an appliance's life expectancy and deciding whether to repair or replace it. Many consumers are unaware of this subtle encoding, yet it's an integral part of the repair world's detective work. Did you know that some washers might be singing their own diagnosis through error codes in their beeps and blinks? Your turn—have you ever uncovered an unusual or hidden feature in your home appliances? Share your story!