Websites such as Manuals Online have instruction manuals for a variety of microwave ovens and other kitchen appliances. Manufacturers' websites also offer instructions for microwaves those companies make.
Searching the manual websites by model number yields the appropriate manual for a given microwave oven. Inside, customers find such items as instructions for setting up and using the unit, cleaning and maintenance tips and troubleshooting keys when the unit does not operate correctly. Warranty and contact information appear in many manuals, as does contact information for the manufacturer should the customer have further questions about the particular unit. In addition to manuals, manufacturers' websites have information regarding product registration and links to technical support centers.