Sundance Circuit Board Guide (6600-726 vs. 6600-720)

Sundance Circuit Board Guide (6600-726 vs. 6600-720)

The "Hidden" Difference: Series 3 vs. Series 5

The Sundance 6600-726 and Sundance 6600-720 boards look identical, but they use different software logic. Installing the wrong one can prevent your heater or circulation pump from running.

Check your EPROM Chip: Look at the small white sticker on the main processor of your old board.

  • Chip starts with a "3": Use the 6600-726. This supports spas with a circulation pump (like the Certa or Chelsee).
  • Chip starts with a "5": Use the 6600-720. This is for spas without a circulation pump (like the Hartford or Hawthorne).

Pro-Tip for Installation

When swapping boards, always match the jumper pin settings from your old board. These pins tell the board whether your spa is running on a 15A, 30A, or 50A breaker.

Jan 17th 2026 SpaStore.com

Recent Posts