Codes help repair technicians diagnose problems that arise with appliances and provide them with information about proper replacement parts. Codes are incorporated into appliances as both a series of numbers and/or letters within the serial number and, in newer appliances with display technology, digitally.
Appliances manufactured within the past 40 years have codes incorporated into their serial numbers. These numbers help technicians determine which parts need to be used when replacement is necessary. High-end appliances manufactured within the past 30 years also feature digitally displayed codes. Explanations for these codes are found in owner's manuals and assist owners with self-diagnosing appliance issues and determining when it is necessary to contact a repair technician.