🌍 Sundance® / Jacuzzi® 6600-397 LCD 850/880 NT Spa Circuit Board (1 or 2-Pump, 50 Hz Export)

The current OEM 50 Hz export replacement PCB for Sundance® 850 Series and 880 Series NT Systems 1- or 2-pump hot tubs — engineered for European, UK, Asia-Pacific, and other 50 Hz / 230 V markets.

🚨 NOT FOR USA — 50 HZ EXPORT BOARD ONLY

⚠️ IMPORTANT: This is a 50 Hz circuit board for export markets ONLY (Europe, UK, Asia-Pacific, and other 50 Hz / 230 V regions). DO NOT INSTALL THIS BOARD ON A US / CANADIAN SPA.

The United States and Canada operate on 60 Hz / 240 V electrical service. This board is engineered specifically for 50 Hz / 230 V markets. Installing a 50 Hz board on a 60 Hz spa will cause incorrect timing of all control functions (filter cycles, pump scheduling, heater logic, freeze protection), improper pump operation, and potential damage to the spa’s heater and pumps.

US / Canadian customers with 850 or 880 Series NT spas should use:

• 6600-728 (US 60 Hz: 880 LCD / J-400 LCD, 2-Pump, “Perma Clear”, Pump 1 = 1-Speed, Pump 2 = 1-Speed, with Circ Pump)
• 6600-730 (US 60 Hz: 850 / J-300 LCD, 2-Pump, “Perma Clear”, Pump 1 = 2-Speed, Pump 2 = 1-Speed, with Circ Pump)
• 6600-390 (US 60 Hz: 880 NT, 2-Pump with PermaClear)

📋 Product Overview

The Sundance® / Jacuzzi® 6600-397 is the current OEM main circuit board for Sundance® 850 Series and 880 Series NT Systems 1- or 2-pump hot tubs in 50 Hz / 230 V export markets. It is the factory replacement for the discontinued 6600-163 (earlier 50 Hz export PCB), and distributor documentation also references it replacing the older 50 Hz legacy PN 6600-072. The 6600-397 is engineered specifically for European, UK, Asia-Pacific, and other 50 Hz / 230 V export markets and is NOT a US / Canadian 60 Hz board.

Coverage spans 2001+ 850/880 Series NT Systems in the export market, with the board consolidating the 50 Hz export LCD lineup into a single current OEM part that serves both 850 and 880 Series NT spa platforms in 1- or 2-pump configurations. This is the 50 Hz export equivalent of the US 60 Hz boards in the same Sundance® LCD and NT families (US 60 Hz segmentation uses different boards for 850 LCD vs 880 LCD vs 880 NT — the 50 Hz export market consolidates this coverage into the 6600-397).

⚠️ 1- or 2-pump ONLY. For 3-pump export Maxxus® / Aspen® spas, a different export board is required — contact Parts4Tubs for 3-pump export board identification.

✨ Key Features

• ✅ Genuine OEM Sundance® / Jacuzzi® 50 Hz export replacement – factory-new
• ✅ Current replacement for discontinued 6600-163 – the previous 50 Hz export PCB
• ✅ Consolidates 850 Series AND 880 Series NT Systems coverage into a single export part
• ✅ 1- or 2-pump configurations – both pump counts supported
• ✅ 50 Hz / 230 V markets ONLY – Europe, UK, Asia-Pacific, and other 50 Hz export regions
• ✅ 2001+ 850/880 Series NT Systems production coverage
• ✅ Non-returnable – spa circuit boards are final sale
• ✅ Covered by manufacturer’s limited warranty

🔧 Technical Specifications

Specification	Value
OEM Part Number	6600-397
Also Listed As	SD6600-397
Alternate Legacy Part Numbers	6600-163 (previous 50 Hz export PN, discontinued), 6600-072 (older legacy 50 Hz PN per distributor listings)
Platform	Sundance® 850 Series / 880 Series NT Systems (50 Hz export configuration)
Market	Export (Europe, UK, Asia-Pacific, and other 50 Hz / 230 V regions)
Supply Frequency	50 Hz (NOT 60 Hz)
Supply Voltage	230 V export standard (verify against spa data plate)
Pump Configuration	1-pump OR 2-pump (system-configured)
Production Years Covered	2001+ 850/880 Series NT Systems (export)
Replaces (Discontinued)	6600-163
Non-Returnable	✅ Yes — final sale
Warranty	Manufacturer’s limited warranty

📌 Regional electrical note: This board operates on 50 Hz / 230 V supply. In export markets, supply voltages typically range from 220 V (Asia-Pacific regions) to 230 V (Europe, UK) to 240 V (UK nominal). The board’s operation depends on 50 Hz frequency. Voltage specifics per spa model are on the spa’s data plate.

📌 Distributor listings reference “2014” on some 6600-397 product pages (e.g., “PCB: LCD 850/880 50HZ 2014”). This “2014” appears to refer to an internal distributor catalog revision rather than a year-of-coverage limit. The underlying production coverage is 2001+ 850/880 Series NT Systems per the predecessor 6600-163 documentation.

🔗 Compatibility Guide

Covered Models — 50 Hz Export Market Only

Platform	Years	Configuration
♨️ Sundance® 850 Series NT (50 Hz export)	2001+	1 or 2 pump
♨️ Sundance® 880 Series NT (50 Hz export)	2001+	1 or 2 pump

Board Replaced by 6600-397

Discontinued Part	Market / Platform	Status
6600-163	50 Hz export, 2001+ 850/880 NT Systems, 1 & 2 Pump	Discontinued → 6600-397

Distributor listings for the discontinued 6600-163 consistently note: “Replaced by 6600-397, which is what will be sent. New part number 6600-397 will be sent, as that is the factory’s replacement.”

Alternate Legacy Part Numbers

Distributor catalog listings reference the 6600-397 under alternate legacy part numbers SD6600-397, 6600-163, and 6600-072. The 6600-072 appears in legacy 50 Hz export documentation but is only lightly referenced in available sources and is not well-documented as a formal replacement chain.

NOT Compatible — Use a Different Board

Your spa	Correct Board
❌ US / Canadian 60 Hz spa (any Sundance® or Jacuzzi® model)	See US 60 Hz board listings (6600-728, 6600-730, 6600-390, 6600-392, 6600-779, 6600-386, 6600-094, 6600-720, 6600-726, 6600-297, etc. — platform-specific)
❌ 850/880 Series 3-pump Maxxus® / Aspen® (export)	Contact Parts4Tubs for 3-pump export board
❌ Sundance® 680 / 780 Series (export)	Different export board required
❌ Jacuzzi® J-Series (J-200 / J-300 / J-400 / J-LX / J-LXL) export	Different J-Series export board required
❌ Non-Sundance®/Jacuzzi® spa	Not applicable

🎛️ Board Functions & Platform Notes

Platform Classification — 50 Hz Export Consolidation

In the US 60 Hz market, Sundance® segments the 850/880 Series NT Systems 1- or 2-pump coverage across multiple current boards (6600-728 for 880/J-400 LCD with Pump 1 = 1-Speed, 6600-730 for 850/J-300 LCD with Pump 1 = 2-Speed, 6600-390 for 880 NT 2-Pump with PermaClear®). The 50 Hz export market consolidates this coverage into the single 6600-397 board, which serves all 1- or 2-pump 850/880 NT export configurations.

This consolidation means the 6600-397 is the single source-of-truth current OEM board for export customers with 1- or 2-pump 850/880 NT Sundance® spas, regardless of whether their US 60 Hz equivalent would be a 6600-728, 6600-730, or 6600-390.

Controlled Outputs

Output	Function
Pump 1	Primary jet pump (per spa’s factory configuration)
Pump 2	Secondary jet pump (for 2-pump configurations)
Heater	Export-market heater (per spa’s installed heater — 50 Hz / 230 V rated)
Spa Lighting	OEM Sundance® lighting
Topside Interface	Sundance® export-market topside (consult spa documentation for exact topside part number per region)

🛠️ Installation Requirements

⚠️ IMPORTANT: Hot tub circuit board installation must be performed by a qualified and licensed electrician in compliance with all applicable local electrical codes and regulations in your country. Electrical code requirements vary significantly by region (UK BS 7671, EU HD 60364, Australian/New Zealand AS/NZS 3000, etc.) and your installation must comply with the specific code in force at your installation location.

Pre-Installation Checklist

• [ ] Confirm your installation is in a 50 Hz / 230 V export market (Europe, UK, Asia-Pacific, etc.) — NOT North America
• [ ] Confirm your spa is a Sundance® 850 Series or 880 Series NT System export model
• [ ] Confirm your spa has 1-pump or 2-pump configuration (NOT 3-pump Maxxus®/Aspen®)
• [ ] Confirm your spa’s data plate specifies 50 Hz supply frequency
• [ ] Verify your spa’s data plate supply voltage (typically 220 V / 230 V / 240 V depending on region)
• [ ] Note your existing board’s part number (6600-397 or discontinued 6600-163)
• [ ] Disconnect all power at the main breaker and the external isolator / RCD switch
• [ ] Wait at least 5 minutes for capacitors to fully discharge
• [ ] Photograph every wire, harness, and connector position before removing the old board

Electrical Requirements (50 Hz Export)

Requirement	Specification
Supply Voltage	Per spa data plate (typically 220 V / 230 V / 240 V for 50 Hz export)
Frequency	50 Hz (NOT 60 Hz)
RCD / RCBO Protection	Required per regional electrical code
Earth / Bonding	Mandatory equipment earthing and equipotential bonding per regional code
Dedicated Circuit	Required per regional code
Isolator Switch	Required within easy access per regional code (e.g., BS 7671 Section 702 for UK)
Cable / Conductor Sizing	Per spa data plate and regional electrical code ampacity tables

💡 Regional code references:

• UK: BS 7671 (IET Wiring Regulations), Section 702 (Swimming pools and other basins)
• EU: HD 60364-7-702 (Low-voltage electrical installations — Swimming pools and fountains)
• Australia / New Zealand: AS/NZS 3000 (Wiring Rules)
• Other regions: Local electrical code

Always verify the specific regional code in force at your installation location with a qualified local electrician.

⚠️ Safety Warnings

🚨 Critical Frequency / Market Safety

• 🚨 DO NOT INSTALL THIS BOARD ON A 60 Hz / US / CANADIAN SPA. Incorrect frequency operation will cause timing errors, improper pump and heater function, and potential equipment damage.
• 🚨 Verify your spa’s data plate confirms 50 Hz supply frequency BEFORE installing this board.
• 🚨 If you are in the United States or Canada, this is NOT the correct board for your spa. Contact Parts4Tubs for the correct US 60 Hz OEM replacement.

Electrical Safety

• ⚠️ ALWAYS disconnect power at both the main breaker and the exterior isolator / RCD switch before any work
• ⚠️ Licensed electrician only — regional codes require it
• ⚠️ Verify RCD / RCBO protection is installed, tested, and compliant with regional code
• ⚠️ Equipment earthing and equipotential bonding must comply with the specific regional electrical code in force
• ⚠️ Never operate the spa with the electrical compartment cover removed

Platform / Compatibility Safety

• ⚠️ Do NOT install the 6600-397 on a 3-pump Maxxus®/Aspen® spa — a different export board is required
• ⚠️ Do NOT install the 6600-397 on a non-850/880 Series Sundance® export spa (680/780 Series, J-Series, etc.)
• ⚠️ Do NOT pair this board with a 60 Hz US topside panel — export topsides are frequency-specific

Water & Electrical Safety

• ⚠️ Ensure no water ingress into the control box during installation
• ⚠️ Inspect all gaskets and seals; replace if damaged
• ⚠️ Never touch any electrical component with wet hands

Post-Installation

• ⚠️ Verify the topside panel displays correctly on first power-up
• ⚠️ Test the high-limit (over-temperature) function and RCD trip before allowing bathers in the spa
• ⚠️ Monitor for any unusual relay clicking, heater cycling, or pump behavior during the first 24 hours

🎯 Ideal Applications

Application	Suitability	Notes
♨️ 2001+ Sundance® 850 Series NT 1- or 2-pump spa in a 50 Hz export market	✅ Direct OEM replacement	Current OEM part
♨️ 2001+ Sundance® 880 Series NT 1- or 2-pump spa in a 50 Hz export market	✅ Direct OEM replacement	Current OEM part
♨️ Export spa with discontinued 6600-163 board	✅ OEM upgrade replacement	Factory’s direct replacement path
♨️ Export spa with legacy 6600-072 board	⚠️ Platform-compatible per distributor alternate PN listing	Confirm with Parts4Tubs or your spa’s documentation before ordering
🛁 US / Canadian 60 Hz Sundance® spa	❌ NOT compatible — DO NOT INSTALL	Use 6600-728, 6600-730, 6600-390, or other US 60 Hz platform board
🛁 3-pump Maxxus®/Aspen® export spa	❌ Not compatible	Contact Parts4Tubs for 3-pump export board
🛁 Sundance® 680/780 Series export	❌ Not compatible	Different export board required
🛁 Jacuzzi® J-Series export	❌ Not compatible	Different export J-Series board required

🤔 Frequently Asked Questions

Q: I am in the United States / Canada. Is this the right board for my Sundance® 880 spa? A: No. The 6600-397 is a 50 Hz export board for European, UK, Asia-Pacific, and other 50 Hz / 230 V markets. US and Canadian spas operate on 60 Hz / 240 V service and require a different board. For US Sundance® 880 Series NT 2-pump spas, use the 6600-390. For 850/880 LCD platform spas, use the 6600-728 or 6600-730 depending on pump configuration. Contact Parts4Tubs with your spa’s exact model, year, and existing board part number for the correct US 60 Hz replacement.

Q: I am in the UK / Europe / Australia / Asia. Is this the right board for my Sundance® 850 or 880 spa? A: Yes, if your spa is a 2001+ Sundance® 850 Series or 880 Series NT System with 1-pump or 2-pump configuration on 50 Hz / 230 V supply. Verify your spa’s data plate confirms 50 Hz frequency before ordering. If your existing board is a 6600-163 or 6600-397, this is the correct current OEM replacement.

Q: My existing board is a 6600-163. Will the 6600-397 fit? A: Yes. The 6600-163 has been discontinued and Sundance® / Jacuzzi® has designated the 6600-397 as the factory replacement. Multiple distributor listings confirm: “Replaced by 6600-397, which is what will be sent. New part number 6600-397 will be sent, as that is the factory’s replacement.”

Q: My existing board is a 6600-072. Will the 6600-397 fit? A: Distributor catalog listings reference 6600-072 as an alternate legacy part number for the 6600-397. Before ordering, we recommend you contact Parts4Tubs with a photograph of your existing 6600-072 board so we can confirm compatibility for your specific spa configuration — especially important because the board is non-returnable.

Q: Why does the US market have separate boards (6600-728, 6600-730, 6600-390) but the export market uses a single 6600-397? A: Sundance® segments the US 60 Hz market across multiple current boards to cover different pump-speed configurations (6600-728 for 2 × 1-Speed pumps, 6600-730 for 2-Speed Pump 1 + 1-Speed Pump 2, 6600-390 for 880 NT with PermaClear®). The 50 Hz export market consolidates this coverage into the single 6600-397, which serves all 1- or 2-pump 850/880 NT export configurations. This is an OEM design decision for export market simplification.

Q: Can I convert a 60 Hz US spa to run on a 6600-397 50 Hz board? A: No. The heater element, pumps, and topside panel in a US spa are designed for 60 Hz operation. Installing a 50 Hz board will not convert the spa — it will cause system malfunction and potential equipment damage. 60 Hz vs 50 Hz is determined at the spa’s factory configuration and cannot be changed by swapping the circuit board alone.

Q: What pump configurations does this board support? A: 1-pump OR 2-pump. The board is factory-configured for the pump count at the spa assembly stage and matches the spa’s installed pump configuration. For 3-pump Maxxus®/Aspen® export spas, a different export board is required.

Q: What topside panel works with this board? A: Export-market topside panels for 850/880 Series NT systems are region-specific and may differ from US 60 Hz topside panels. If your existing export topside is functional, retain it. Contact Parts4Tubs or your regional Sundance® distributor if you need to replace the topside.

Q: Is this board supplied with installation documentation in my language? A: Manufacturer-supplied documentation typically includes installation notes in English. Some regional distributors may include translated documentation. Installation requires a qualified local electrician familiar with regional electrical codes regardless of documentation language.

Q: Is this an OEM or aftermarket board? A: The 6600-397 is the genuine OEM Sundance® / Jacuzzi® 50 Hz export replacement board, factory-new.

Q: Is the board returnable if I order the wrong one? A: No. Per manufacturer policy and regional distributor policies, spa circuit boards are final sale and cannot be returned once purchased — regardless of whether the board has been installed. Confirming your spa is a 50 Hz / 230 V export model, on the 850/880 NT platform, with 1- or 2-pump configuration, before ordering is essential.

✅ Why Choose the 6600-397

• ✅ Genuine OEM Sundance® / Jacuzzi® 50 Hz export replacement – factory-new
• ✅ Current replacement for the discontinued 6600-163 export board
• ✅ Consolidates 850 Series AND 880 Series NT Systems 1- or 2-pump export coverage in one current OEM part
• ✅ Engineered for 50 Hz / 230 V export markets (Europe, UK, Asia-Pacific, etc.)
• ✅ Direct-fit mounting for 2001+ 850/880 Series NT equipment bays
• ✅ Backed by the Sundance® / Jacuzzi® manufacturer’s limited warranty

🌍 Why Buy From Parts4Tubs

• ✅ Fast shipping for export customers
• ✅ Frequency verification help — the #1 customer ordering error is a US customer mistakenly ordering a 50 Hz export board (or vice versa). Contact us with your spa’s data plate photo and we will confirm 50 Hz vs 60 Hz before you order.
• ✅ Expert identification help for the 6600-163 → 6600-397 transition and the legacy 6600-072 → 6600-397 path
• ✅ Competitive pricing on current OEM boards
• ✅ Full manufacturer warranty support
• ✅ Platform-history expertise across the Sundance® 850/880 platform lineage — including US 60 Hz equivalents (6600-728 / 6600-730 / 6600-390) when customers are unsure which market their spa is configured for

Not sure if this is the right export board? Contact our team with:

• Your country / region of installation (to confirm 50 Hz export market)
• Your spa’s model and year
• A photograph of your spa’s data plate showing supply voltage and frequency
• Your existing board’s part number (if accessible)
• Your spa’s pump configuration (1-pump or 2-pump)

⭐ Summary

The Sundance® / Jacuzzi® 6600-397 is the current OEM 50 Hz export replacement circuit board for 2001+ Sundance® 850 Series and 880 Series NT Systems 1- or 2-pump hot tubs in European, UK, Asia-Pacific, and other 50 Hz / 230 V export markets. It is the factory replacement for the discontinued 6600-163 (previous 50 Hz export PCB) and is also referenced against the legacy 50 Hz part number 6600-072 in distributor catalogs. The 6600-397 consolidates 850 Series AND 880 Series NT Systems 1- or 2-pump export coverage into a single current OEM part, in contrast to the US 60 Hz market which segments this coverage across multiple boards (6600-728, 6600-730, 6600-390). This board is NOT for the United States or Canada — US / Canadian 60 Hz customers must use the appropriate US 60 Hz platform board (6600-728 / 6600-730 / 6600-390 / 6600-392 / 6600-779 / 6600-386 / 6600-094 depending on spa platform and configuration). Non-returnable; manufacturer’s limited warranty. Verify your spa’s data plate frequency (50 Hz), pump count (1 or 2), and 850/880 NT platform designation before ordering.

Finding and identifying a replacement Hot Tub Circuit Board (PCB)

If you are looking to replace a failed PCB on your Hot Tub’s spa pack, then quite often identifying the part that you need can be the hardest thing.

Firstly, you are looking for a model number on the actual circuit board itself. Having the model or serial of your hot tub is not going to help at this point, you need to find the number on the PCB itself.

Now, with certain brands of PCB, the number of the replacement PCB that you need is not going to match identically the one you are replacing. Why is that I hear you ask?

Well, normally, it is an updated version. This means that it might have updated firmware on the PCB or be a later revision. Normally, this means that the part number would be slightly different. This is usually indicated with a “12345678 -x” at the end of that part number where x indicated a firmware revision.

In some cases, there will be some following letters on the part number of the circuit board, “12345678 -x MAS” this can indicate that the PCB was used for an OEM meaning it was produced for a certain hot tub manufacturer and the letters identify the manufacturer.

This means if you source an original PCB, it will not have the letters, but will in most cases work just fine.

It can be confusing I know!

What if you can’t find a model number?

If you can’t find a model number on the PCB itself, then you need to look for a model number on the spa pack. Normally, there is a sticker on the outside of the spa pack that tells you the current ratings and input voltages etc and this will have a model number.

In general, most spa packs in the USA are manufactured by Balboa, Hydro-Quip, ACC or Gecko. I know I am generalising here, but if you have a spa pack that has the brand of your hot tub on, it will be an OEM so the key is identifying who made the original box.

From there, you can normally find an original PCB that you will be able to switch out.

For example, the Balboa VS (value series) is a very popular spa pack that has been used by multiple hot tub manufacturers under their own brand names. Whatever they have called it, strip it back and it is still a Balboa VS.

Visual Inspection

One of the most important things you can do when you are looking for a replacement is to visually inspect the PCB that you have versus the picture online of the replacement you are considering. They need to look the same even if there are the differences in firmware revisions or OEM part numbers, you should be visually replacing a PCB that looks like the one you have.

Configuring a replacement Hot Tub Circuit Board (PCB)

When you get a new PCB, you are more than likely going to need to configure it. Most PCBs have a number of different modes and setups that the can operate in. For this, you will need to manual or spec sheet to guide you.

For things like DIP switches, most of the time you can copy the settings from your original circuit board. You are looking for things like setting the voltage as a lot of PCBs can be configured to run on both 115V and 230V.

You may need to move jumpers or even wires to configure voltages – the key here is that you read the schematic and don’t expect the PCB to just work out of the box – it usually doesn’t.

Troubleshooting a Hot Tub Circuit Board (PCB)

Here are some common things you will see when you replace a PCB on a hot tub.

You press the buttons on the topside control and they don’t control the right parts (pumps or blower etc) – this is a mode configuration thing and you will either need to change some DIP switches on the PCB or an internal or low level programming mode on the topside control. Check the manual for how to do this.

You turn on the hot tub and it trips the breaker – it is not common for a new PCB to fail out of the box (I have not seen one yet!) However, a common mistake is that the voltage has not been set correctly. If it is set for 115V and then you try and turn it on, the current draw will be a lot more (twice) than expected and the breaker will trip.

To check this, unplug all of your kit – heater, pumps, blower and then turn on the PCB. If it trips with nothing plugged in, usually the voltage is incorrectly set and what is happening is that live current is being sent to the ground – because you have 4 wires into the PCB rather than 3. Current on the ground loop causes the trip. Check the settings to make sure it is configures for 230V.

It might not trip until you physically turn on a pump or a blower. As mentioned, if the pack is set to 115V and your pump is meant for 230V, it will draw twice the current at half the voltage and trip your breaker. Check the manual for info on how to set the voltage.