Appliance repairs often require the assistance of a qualified professional. Depending on the type and complexity of the appliance, the repair process may vary. In general, appliance repairs start with a proper diagnosis of the problem. Once the nature of the problem is determined, the appliance may need to be disassembled, tested, or replaced in order to complete the repair. If parts need to be replaced, the technician will order them from the manufacturer or a parts supplier and install the new part. They may also need to install any additional parts to complete the repair. After the repair, the technician can verify that the appliance is functioning properly by testing it.