The General Electric WS21X20981 Water Softener PWA Control Board restores proper operation by regulating essential water softener functions. Designed as a replacement printed wiring assembly (PWA) control board for compatible water softener systems, this part processes user settings and transmits electronic signals to coordinate regeneration cycles, timing sequences, and other operati... https://www.hnkparts.com/ws21x20981-general-electric-control