Part Number: 6600-404
Brand: Sundance Spas
Sundance® 780 ENC Logic Board – 2‑Pump Systems (Hamilton, Chelsee, Bristol, Montclair)
⚠️ IMPORTANT DISCLAIMER – PLEASE READ BEFORE PURCHASING
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There are no refunds or returns on electronic spa parts, including control panels and keypads.
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Please verify compatibility with your hot tub model before ordering.
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All electronic components are covered under the original manufacturer’s warranty.
- Will only work with an encrypted control panel P/N 6600-385
- Cannot be used with control panel 6600-116
Overview
Part 6600‑404 is the OEM 2‑Pump ENC System Circuit Board used in Sundance® 780™ Series spas manufactured from May 24th, 2018 through October 2023. This control board manages all primary spa operations, including pump sequencing, heater logic, lighting, ClearRay® UV readiness, and filtration cycles.
It is engineered specifically for the ENC‑style control box used during this manufacturing window, replacing earlier 780 series 2‑pump PCBs like 6600‑848 (pre‑05/2018 models).
Compatible Spa Models & Years
✔ Sundance® 780™ Series (2‑Pump Models)
Production Range: 05/24/2018 – 10/2023
| Model |
Compatibility |
| Hamilton |
2018.5 – 2023 |
| Chelsee |
2018.5 – 2023 |
| Bristol |
2018.5 – 2023 |
| Montclair |
2018.5 – 2023 |
Technical Details
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System Type: Sundance® 780 ENC (Enhanced North American Control)
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Pump Configuration:
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Pump 1: 2‑speed
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Pump 2: 1‑speed
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Board Functions:
- Jet pump control
- Heater operation logic
- Filtration cycle timing
- Lighting system control
- ClearRay® UV indicator logic
- Temperature & high‑limit sensor interface
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Voltage: 240V system
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Firmware: ENC 780 2‑Pump operating logic (2018.5+ revision)
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Topside Compatibility: 780 Series touchpad & LCD panel (2018+)
Purpose & Performance
The 6600‑404 Circuit Board:
- Coordinates 2‑pump hydrotherapy operation in 780 models
- Manages the 5.5 kW heater within the spa’s 780 control architecture
- Integrates with Sundance’s ClearRay® water‑care system
- Provides efficient filtration & temperature regulation cycles
- Supports LED lighting control on 2018+ updated 780 Series shells
- Features updated logic for improved reliability over previous 780 boards (pre‑2018)
Replacing this PCB resolves:
- Dead or unresponsive topside
- No‑heat issues
- Pump activation failures
- Lighting malfunctions
- Logic‑based FLO/OH/ILOC errors common with failing 780 boards
Related / Previous Parts
| Part Number |
Description |
Notes |
| 6600‑848 |
780 2‑Pump Board (04/2017 – 05/23/18) |
Direct predecessor |
| 6600‑846 |
780 1‑Pump (04/2017 – 03/2021) |
Not interchangeable |
| 6600‑404 |
Current listing (05/24/18 – 10/2023) |
This part |
| ClearRay® support parts |
Sensors & wiring |
Board interfaces but does not include module |
Ordering Notes
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ONLY for 780 Series 2‑Pump ENC systems built 05/24/18 – 10/2023
- Not compatible with:
- Pre‑2017 780 boards (different harnessing & logic)
- 1‑Pump systems (use 6600‑846 instead)
- 2024+ True Platform systems
- Electronics are non‑returnable once installed (standard Sundance/Jacuzzi policy).
- Always confirm spa serial number prefix before ordering.
