The VS501 is no longer made but we do carry the newest replacement here: Control Retrofit Kit Balboa BP7, 1 or 2 Pump/Blower ,Ozone ,Light, 5.5kW, 115v/230v, with TP500 Topside

Balboa Duplex Digital System Control board, 54003. Connects to spa side control with single phone type connector. Replaces many discontinued OEM boards such as Dynasty Spas, Alps Spas, Nordic Spas, Master Spas, Viking spas and many more.

Replaces: 6300DR1(x), ALP50R1(x), _50884-01R, 1900DR1A, 1900DR1D, 2500ESR1C, 410ER1C, 50884-01, 50884-01R, 50911, 51405, 51421, 51542, 51569, 51569-02 , 51586 , 51859 , 54003 , 611311 , 6300DR1A , 9710-09 , ALP50R1C , BAL54003 , BH50D , C11JDR1A , C11JDR1B , DAK50R1B , DIGDUPR1(x), DIGDUPR1A, DS50R1A , DS50R1C, DYN100R!E, DYN100R1C, MAS125R1A, MIL75R1B, MOR100R1B, NOR124R1, P295R1A , RET50R1A, SS23DR1B, SS23DR1C, VIK100R1A, VIK100R1B, 
ZX500DR1A, 2500ESR1(x)

Please Note: Circuit Boards are a final sale and cannot be returned. Please be sure that the board is needed and the correct model for your spa is being ordered. Many circuit boards look identical, but have a different software programming that will only work with certain topside controls and components. If you are not sure what board is needed please contact us with your processor number and board number. Both can be found on stickers located on the micro chip and green portion of board.