Sundance® 780 Series 2‑Pump Control Board – 60 Hz (‘23 Electronics Platform) Part #6600‑624

Part 6600‑624 is the official 2023+ Sundance® 780 Series 2‑Pump system control board, introduced for spas manufactured November 2023 and later. This updated PWA (Power/Logic Assembly) supports the new ‘23 electronics platform, adding the Exterior Light (EXL) function and updated logic handling for 780 multi‑pump models.

This board replaces earlier 780 2‑pump PCBs such as 6600‑848 (2017–2018) and 6600‑404 (2018–2023). It is the ONLY correct controller for 780 models produced from 11/2023 forward.

Compatible Spa Models & Years

✔ Sundance® 780™ Series — 2‑Pump Spas

Production Window: November 2023 – Present

Approved models:

• Hamilton (2‑pump)
• Chelsee (2‑pump)
• Bristol (2‑pump)
• Montclair (2‑pump)

✖ NOT compatible with:

• Dover (1‑pump) → uses 6600‑623
• Any 780-spa made before 11/2023
• 780 2‑pump boards 2017–2023 (6600‑848, 6600‑404)
• 880 / 980 Series
• 680 & 980 BP systems
• Export 50 Hz models

Technical Details

• Voltage: 240V, North American 60 Hz
• Pump Configuration:
  • Pump 1: 2‑speed
  • Pump 2: 1‑speed
• Firmware: Revision 2.07
• System Platform: Sundance® 780 ‘23‑update logic (post‑ENC generation)
• Added Features:
  • Exterior Light (EXL) support (new for this generation)
• Topside Compatibility:
  • Updated 2023+ 780 LCD panels (model‑specific compatibility required)
• Heater Support: 5.5 kW stainless‑steel Sundance heater (standard 780 specification)
• Sensor Support:
  • Temperature sensor
  • Hi‑limit sensor
  • Flow/pressure switch (model‑dependent)

Purpose & Performance

The 6600‑624 board manages all primary spa operations in 2‑pump Sundance® 780 models:

• Jet pump sequencing and load management
• Heater enable/disable logic
• Circulation and filtration logic (Smart Logic™ 780 cycle algorithms)
• ClearRay® UV system readiness & indicator
• LED lighting and Exterior Light control
• Diagnostic and watchdog monitoring:

Common faults addressed include:

• FLO
• OH
• Sn1 / Sn2
• Watchdog reset
• Pump startup failure
• No‑heat conditions

Replaces Previous Boards (Not Interchangeable With)

This board does NOT backward‑fit earlier models. It replaces:

Important:
6600‑624 must only be used on 11/2023+ spas due to platform, wiring, and firmware changes.

Related Components

• 6600‑623 — 780 Dover 1‑pump board (2023+)
• 6600‑384 / 6600‑385 — Compatible 780 topside controls
• 6500‑series heaters — Sundance 5.5 kW heater tube assemblies
• ClearRay® UV lamp + ballast assemblies
• 6600‑167 / 6600‑110 — Temp & hi‑limit sensors

Ordering Notes

• ONLY fits 11/2023+ 780 Series 2‑pump models.
• NOT compatible with previous 780 electronics (2014–2023).
• Must verify spa serial number and pump configuration before ordering.
• All electronic spa components are non‑returnable.
• Installation should be completed by a qualified spa technician due to system calibration requirements.