In order to find repair professionals with the official certification and training to work on specific refrigerators, consumers can visit the refrigerator manufacturer's website. Manufacturers such as GE and Kenmore provide information that directs consumers to local service companies with technicians who have the appropriate training.
In many cases, if the refrigerator is still under warranty, the warranty paperwork contains contact information for setting up service for covered items. After the warranty expires, the owner is free to choose his own repair service. Some companies add the word "certified" to their names or feature that word prominently in their marketing, but it's important to inquire as to whether that certification extends to a specific brand of refrigerator.