Part Number: 6600-623
Brand: Sundance Spas
PWA: CNTRL 780 1‑Pump 60Hz ‘23 – Sundance® Dover Control Board
⚠️ IMPORTANT DISCLAIMER – PLEASE READ BEFORE PURCHASING
- There are no refunds or returns on electronic spa parts.
- Please verify compatibility with your hot tub model before ordering.
- All electronic components are covered under the original manufacturer’s warranty.
Overview
Part 6600‑623 is the official 2023+ Sundance® 780 Series 1‑Pump system control board, used exclusively in the Dover model beginning in late 2023. This PCB replaces earlier 780 1‑pump boards—including 6600‑846 (2017–2023)—as part of Sundance’s electronics update cycle for the 780 platform.
This control board interfaces with Sundance’s updated 780 LCD topside panels, manages the heater, circulation timing, lighting control, and the single jet pump used in the Dover spa.
Compatible Spa Models & Years
✔ Sundance® 780™ Series (1‑Pump Models)
Production Window: Late 2023+ (Model Year ‘23/’24)
Compatible Model:
-
Dover (1‑Pump configuration only)
✖ NOT compatible with:
- 2‑pump 780 models (Hamilton, Chelsee, Bristol, Hanover, Montclair) → use 6600‑404 / 6600‑848 depending on year
- Pre‑2017 780 boards (different wiring harness & logic)
- 880, 980, or 680 Series spas
- European 50Hz models
Technical Details
-
System Type: Sundance® 780 ENC “’23 revision” control board
-
Pump Configuration:
-
Pump 1: 2‑speed (jet + filtration)
-
Voltage: 240V, North American 60Hz
-
Topside Panel Compatibility:
- Sundance® 780 Series LCD interfaces (2023+)
-
Heater Control:
- 5.5 kW stainless heater (standard 780 element)
-
Supported Sensors:
- Temperature sensor
- Hi‑limit sensor
- Flow/pressure switch (model‑specific)
-
Integrated Features:
- Smart Logic filtration
- ClearRay® UV readiness
- LED lighting control
- Watchdog and safety shutoff logic
Purpose & Performance
The 6600‑623 Dover control board manages:
- Water temperature and heater activation
- LED lighting and auxiliary functions
- 2‑speed pump sequencing (low‑speed filtration / high‑speed jets)
- ClearRay® UV logic (monitoring/indicator)
- Circulation timing and Smart Logic cycles
- Safety and fault monitoring (FLO, OH, Sn, ILOC, etc.)
Replacing the board resolves issues such as:
- No power to topside
- Heater not activating
- Jet pump failing to start
- FLO/OH watchdog system lockouts
- ClearRay® indicator faults
Related / Predecessor Components
Boards replaced by 6600‑623
| Old Part Number |
Usage Window |
Notes |
| 6600‑846 |
04/2017 – 10/2023 |
Former Dover 1‑pump board (verified via retailers) |
Other Associated Components
- 780 Series topside (6600‑384/385 family)
- 5.5 kW heater tube assembly
- ClearRay® UV lamp/ballast
-
Sensors: 6600‑167, 6600‑110 (model‑dependent)
Ordering Notes
- Only fits 1‑Pump Sundance® 780 Dover spas built late 2023 or newer
- Not interchangeable with any multi‑pump 780 boards
- Must match spa’s pump configuration and topside generation
- All electronic spa components are non‑returnable
- If replacing a burnt or water‑damaged PCB, verify upstream components (heater, sensors, pumps) before installation
- 6600-623, 1-pump 60 HzEL '23 board for:
- 11/2023+ 780 1-pump Dover
- Revision 2.07
- Exterior Light function added
