Contacting the store that you purchased the appliance from is often the first step in finding a certified service technician in your area. Most stores will have lists of recommended repair professionals and may even offer their own repair people that can quickly respond to your appliance problem.
When you are looking for appliance repair make sure that you choose a reputable person to perform the task for you. Look into the reviews that have been posted online to determine if they meet the needs that you have as well as if they have any complaints against them.