Circuit Boards
Spaparts123.com carries the full line of Cal Spas Original Circuit Boards.
Locate a white tag, generally stuck to a black relay. Look for a 5 digit number that starts with a (5).
It may look like this: 54321**22001122012
Look for the Chip Number. This will be a combination of letters and numbers.
It may look like this: C2100R1E