Part Number: 6600-604
Brand: Sundance Spas
Control Panel: Sundance® 780 Dover – 1‑Pump, Revision 2.06 with Exterior Light Function
⚠️ IMPORTANT DISCLAIMER – PLEASE READ BEFORE PURCHASING
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There are no refunds or returns on electronic spa parts.
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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 6600‑604 is the OEM topside control panel used on late‑2023 and newer Sundance® 780 Series Dover spas. Introduced in the 11/2023 electronics update, this control panel is designed for 1‑pump systems in both North American (60 Hz) and Export (50 Hz) markets.
This updated panel includes Revision 2.06 firmware, which adds the Exterior Light (EXL) control option—functionality not available on earlier Dover topsides.
No gasket is available for this model from Sundance® (panel is installed without a separate replacement gasket).
Compatible Spa Models & Years
✔ Sundance® 780™ Series (1‑Pump Model)
Dover — 11/2023 – Present
This topside is only used on the redesigned 2023+ Dover platform.
✖ NOT compatible with:
- Any 780 2‑pump spas (Hamilton, Chelsee, Bristol, Montclair)
- Any Dover built before 11/2023
- 780 ENC panels (6600‑063, 6600‑385, etc.)
- 880 / 980 Series control systems
- BP‑platform Jacuzzi® topsides
Technical Details
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Voltage: Works with both NA 60 Hz & Export 50 Hz versions
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Pump Configuration:
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Firmware Revision: 2.06 (with added EXL function)
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Display Type: LED 7‑segment digital display
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Button Layout (typical):
- Jets
- Light
- Temp ↑
- Temp ↓
- Mode/Menu
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Additional Features:
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Exterior Light (EXL) button/logic support (new for 2023+)
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Connector Type: Ribbon‑style topside cable
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Gasket: None available
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Environmental Protection: Waterproof membrane keypad
Purpose & Performance
This topside is responsible for controlling:
- Jet pump high/low speeds
- Temperature adjustment
- Heater mode (Standard / Economy / Sleep)
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Exterior lighting (new EXL feature)
- Filtration cycles (Smart Logic)
- LED spa lighting
- Display of water temperature & system messages
- Diagnostic errors including FLO, OH, Sn1/Sn2, and watchdog alerts
Replacing this control panel resolves:
- Dead or blank display
- Non‑responsive buttons
- Inaccurate temperature display
- Lost ability to control exterior lighting
- Moisture‑damaged membrane switch
- Mode/logic failure due to topside damage
Related Components
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6600‑623 / 6600‑624 — Matching 2023+ 780 control boards
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6560‑000 / 6600‑110 / 6600‑167 — Sensors
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5.5 kW heater (6500‑series) — Compatible with 780 systems
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ClearRay® UV lamp & ballast — Optional per model
Ordering Notes
- Only for 11/2023+ Sundance® 780 Dover 1‑pump spas
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Not interchangeable with earlier Dover control panels
- Ensure your spa’s serial number indicates late 2023+ production
- No gasket available for this part
- Electronic components are non‑returnable
