If you are calling a repair person, be sure to have all the information about the appliance including the model, make and year purchased, as well as information about what the problem is. The more detailed you can be in describing the problem the more likely they will have the right part when they come for the repair.
Appliances do require regular maintenance which may include cleaning and service work. If you keep up with the recommended maintenance often the larger issues never arise. Most repairs are caused by equipment not properly cared for.