Part Number: 6600-730
Brand: Sundance Spas
Main Control PCB – Sundance® / Jacuzzi® NT Logic System (Replacement for 6600‑028)
⚠️ 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.
Overview
Part 6600‑730 is the updated OEM 3‑Pump NT System Control Board designed for Sundance® and Jacuzzi® premium spa platforms. This board replaces the earlier, discontinued 6600‑028 and incorporates updated firmware, improved pump logic, refined heater management, and expanded compatibility with UV/PermaClear® systems.
This PCB controls all major spa functions including pump sequencing, heater logic, CLEARRAY®/UV operation, circulation pump runtime, and lighting system control. It is a direct‑fit replacement for older boards using the same NT control architecture.
Since legacy PCB 6600‑028 is now fully superseded, 6600‑730 is the required service replacement.
Compatible Spa Models & Systems
(Matches the same control family as 6600‑392, but with firmware revisions replacing 6600‑028.)
THIS BOARD USED ON 880/850 SERIES (EXCEPT MAXXUS AND ASPEN) PRIOR TO WATERFALL AND HI FLOW CIRC PUMP AND OLDER JACUZZI J-300 SERIES BELOW
6600-730 formerly 6600-028, 1997-2005 850 systems, 1 and 2-pump with PermaClear (EPROM Rev. 1.28GX+ included), for all Sundance Spas models except Maxxus.
✔ Sundance® 880™ Series
Used on the following Sundance® Spas with a 2 Speed Pump #1 and NO WATERFALL:
- 1997-2000 850 Sundance®
- 2005-2008 (Spring) 850 Sundance® PRIOR to WATERFALL and HI FLOW CIRC (MUST HAVE 6000-125)
- 2001 850 Sundance® NT (1 speed air blower only)
- 2002-2005 Sundance® NT (1 speed air blower only)
Compatible with select NT‑logic, 3‑pump configurations including:
- Aspen®
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Cameo® (3‑pump system years)
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Optima® (NT‑logic years)
✔ Sundance® 980™ Series
Compatible only in NT‑logic 3‑pump configurations (varies by model‑year).
✔ Jacuzzi® Premium (Shared Electronics Platform)
For Jacuzzi® models using NT‑style 3‑pump boards (e.g., pre‑Balboa SmartTub upgrades):
- Select J‑400™ models
- Select J‑500™ models
- 2002-2006 J-375, J-370, J-365, J-365, J-355, J-350
Replaces:
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6600‑028 (legacy, discontinued)
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6600‑155 (older 880 Maxxus board)
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6600‑160 (updated Maxxus firmware)
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6600‑398 (Aspen/Maxxus NT board)
- Early NT logic boards across 880/900‑era Sundance® systems
Technical Details
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Voltage: 240V system board
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Pump Configuration: 3‑Pump primary hydrotherapy layout
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Processor / EPROM: Updated revision replacing earlier NT firmware
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Supported Features:
- CLEARRAY® / PermaClear® UV logic
- Smart Logic circulation timing
- Heater sequencing (50A/60A selectable)
- LED and incandescent lighting logic
- Error/fault logging
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Topside Compatibility: Sundance® NT LCD/LED topside systems
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Connectors: Mini‑DIN, pump relays, heater terminals, UV and circulation harnesses
Purpose & Performance
The 6600‑730 board performs all central control functions in Sundance®/Jacuzzi® premium spas:
- Controls three high‑output therapy pumps
- Manages heater safety and temperature logic
- Interfaces with UV/PermaClear® modules
- Sets filtration cycles & circulation operation
- Controls lighting and auxiliary accessories
- Stores diagnostic logs for service technicians
Upgrading to the 6600‑730 may resolve older PCB issues including:
- FLO / OH / OH2 logic faults
- Dead topside panel
- Jet pumps failing to start
- Heater not activating
- ILOC pump lockout
- UV light/indicator malfunctions
Ordering Notes
- Electronics are non‑returnable once shipped or installed.
- Requires correct jumper configuration after installation (50A/60A, UV enable/disable, pump count).
- Ensure the spa uses a 3‑pump NT‑logic system before ordering.
- For spas originally equipped with 6600‑028, this is the only OEM‑approved direct replacement.
Note: 6600-017, 6600-018, 6600-023, 6600-028, are the same boards with different EPROMs.
