The Panasonic FFV4700011S Ventilation Fan PC Board controls the fan’s electrical operation and speed settings. It receives signals from the control panel and sends power to the fan motor according to the selected setting. Designed for compatible Panasonic ventilation fans, this replacement board provides a proper fit and restores normal fan operation when the original board is damaged... https://www.hnkparts.com/ffv4700011s-pc-board