IFB Microwave Oven Service Center in Hyderabad They are mostly popular for reheating the cold form and regenerate the taste in them. It uses the working principle of IFB microwave radiation with frequency that is higher than radio waves but quite lower than infra-red light. This mode of cooking doesn’t affect any loss in nutrients quality of the food. IFB Microwave Oven Service Center in Hyderabad Door not closing properly, light bulb stopped working, exhaust fan not working, displays, buttons and mechanism has stopped completely. Noises coming inside from the microwave also inform that there is something wrong with mechanism.