Overview Reviews Similar Products Product Description CIRCUIT BOARD 2100 C2100RIA, R1C (2000) - CS5000 Cal Spas Circuit Board, Processor: C2100R1C. or Processor: CS5000R1D Balboa PN#: 52299 2100R1B Product Videos Custom Field Product Reviews Find Similar Products by Category Recommended Quick view Cal Spas Circuit Board, C3000R1F 30 Day Warranty $475.95 Add to Cart Quick view Cal Spas Circuit Board C4000R1C 30 Day Warranty $409.95 Add to Cart Quick view Cal Spas Circuit Board, C4001RIC 30 Day Warranty $409.95 Add to Cart