We are a wholesale distributor of spa and hot tub parts. We sell exclusively to pool & spa professionals.  
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ELE09100025 Cal Spas Circuit Board, Chip Numbers: CS5X00R1A (Newer Revisions May End With Any Letter). Balboa Part Number 54412-01
THIS ITEM HAS BEEN DISCONTINUED BY THE MANUFACTURER.
This Circuit Board Is Compatible With Balboa Sensor Assembly, Part Number: BAL30337 And 220v Transformer, Part Number BAL30274-2, Or 110v Transformer, Part Number BAL30274-1 (Check Wiring Diagram).
NOTE: Please Check Your Chip ID Number On Your    Old  Circuit Board To Make Sure This Is The Correct Circuit Board For    Your  Spa. Also, Check The Balboa 5-Digit Number. This Number Is  Located   On A  White Sticker And Always Starts With A "5". This Part Is    Non-Returnable,  Only For Exchange On Warranty.
Cal Spas Offers A Limited 30-Day Warranty On Their Circuit Boards.