⚡ Sundance® / Jacuzzi® 6600-094 Maxxus® 850 NT Series Spa Circuit Board (3-Pump with PermaClear®)

The current OEM replacement PCB for 2002–2004 Sundance® Maxxus® 850 Series New Technology (NT) 3-pump hot tubs equipped with PermaClear® ozone sanitation and a circulation pump.

📋 Product Overview

The Sundance® / Jacuzzi® 6600-094 is the current OEM main circuit board for 2002–2004 Sundance® Maxxus® 850 NT Series premium 3-pump hot tubs equipped with PermaClear® ozone sanitation and a 24-hour circulation pump. Shipping with EPROM Rev 9.60B (the 9.60B+ family), this board is the active OEM replacement for the discontinued 6600-023 (1999–2001 Maxxus 850 with ISO-Pure salt generator, EPROM Rev 1.30B/1.30D) and the discontinued 6600-057 (2001 Maxxus with PermaClear®, EPROM Rev 1.30D+).

The 6600-094 represents the 850 NT (New Technology) platform — a distinct control architecture from the original 850 Series (6600-017/018/023/028 family with 1.27/1.28/1.29/1.30 EPROMs) and from the later 880 LCD (6600-728/730) and 880 NT (6600-390/392) platforms. The 850 NT architecture uses the 9.xx EPROM family (9.50B for the 1- or 2-pump 6600-092 sibling, and 9.60B for this 3-pump Maxxus® variant), and was specifically engineered for the high-demand 3-pump Maxxus® configuration with PermaClear® ozone and circulation pump 24-hour operation.

⚠️ This board WILL NOT operate ISO-Pure salt-generator systems. The 6600-094 replaces the discontinued 6600-023, but does NOT include ISO-Pure salt-generator compatibility. If your existing Maxxus® 1999–2001 spa has an ISO-Pure salt system, upgrading to the 6600-094 will require abandoning the ISO-Pure salt generator and switching to a non-salt sanitation method (the PermaClear® ozone built into the spa continues to function). ⚠️ This board is for 850 Maxxus® NT 2002–2004 specifically. For 2005+ Maxxus® and 880 Maxxus®/Aspen® 3-pump configurations, use the 6600-392 (current successor that replaces 6600-155 / 6600-160 / 6600-398).

✨ Key Features

• ✅ Current OEM Sundance® / Jacuzzi® replacement – factory-new with EPROM Rev 9.60B+ installed
• ✅ Direct replacement for discontinued 6600-023 and 6600-057 – restores Maxxus® 3-pump functionality
• ✅ Maxxus® 850 NT Platform coverage – 2002–2004 production years
• ✅ 3 jet-pump outputs – for the Maxxus® high-demand jet configuration
• ✅ PermaClear® ozone support – drives the factory-installed PermaClear® sanitation system
• ✅ 24-hour circulation pump control – continuous filtration operation
• ✅ 850 NT (New Technology) architecture – 9.60B+ EPROM family
• ✅ Built-in spa lighting control – drives OEM Maxxus® lighting
• ✅ Covered by manufacturer’s limited warranty

🔧 Technical Specifications

Specification	Value
OEM Part Number	6600-094
Also Listed As	SD6600-094, PCB49066
Platform	Sundance® 850 NT (New Technology) 3-Pump
Spa Family	Maxxus® 850 Series
EPROM Revision	Rev 9.60B (9.60B+ family)
Production Years Covered	2002 – 2004
Pump Configuration	3 pumps + dedicated circulation pump
Sanitation System	PermaClear® ozone (supported — required)
ISO-Pure Salt Generator	❌ NOT supported (this is a critical difference from the discontinued 6600-023)
Replaces (Discontinued)	6600-023 (1999–2001 Maxxus with ISO-Pure, EPROM 1.30B/1.30D), 6600-057 (2001 Maxxus with PermaClear®, EPROM 1.30D+)
Successor for 2005+ Maxxus/Aspen	6600-392 (880 Maxxus/Aspen 3-pump, IC Processor Rev 3.1A+)
Sibling on 850 NT Platform	6600-092 (850 NT 1 or 2 pump with PermaClear®, EPROM Rev 9.50B+, 2002–2005)
Compatible Topside	Sundance® 6600-866 (850 Maxxus 3-pump control panel, 2001+ overlay)
Non-Returnable	✅ Yes — final sale
Warranty	Manufacturer’s limited warranty

📌 Electrical supply voltage is spa-model-specific. Maxxus® 850 NT spas typically ship configured for 240 V / 60 Hz service in the US market (this is a premium 3-pump spa with high amperage demand). Always verify against your spa’s data plate before connecting power. No universal voltage/amperage rating is published for the bare 6600-094 PCB by the manufacturer, because the configuration depends on the spa’s installed heater, pumps, and service supply.

📌 Technical note on Maxxus® pump wiring: Per Sundance® documentation for the 1999+ Maxxus® platform, the 2nd pump relay is not located on the circuit board — it is an external component within the spa pack. This is relevant during installation and troubleshooting.

🔗 Compatibility Guide

Covered Models

Model	Years	Configuration
♨️ Sundance® Maxxus® 850 NT	2002 – 2004	3-pump with PermaClear® ozone and 24-hour circulation pump

Boards Replaced by the 6600-094

Discontinued OEM	Years	EPROM	Notes
6600-023	1999 – 2001 Maxxus® 850	Rev 1.30B (obsolete) / 1.30D	Original with ISO-Pure salt generator support — replacement 6600-094 DOES NOT support ISO-Pure
6600-057	2001 Maxxus® 805	Rev 1.30D+	2001 transitional Maxxus® 3-Pump with PermaClear® (Special Order Only status)

Sundance® Maxxus® 3-Pump Board Lineage (for Disambiguation)

Era	Board	EPROM / Processor	Status
1999 – 2001 (850 era, ISO-Pure salt)	6600-023	Rev 1.30B / 1.30D	Discontinued → 6600-094 (no salt support)
2001 (850 transition)	6600-057	Rev 1.30D+	Discontinued → 6600-094
2002 – 2004 (850 NT era — THIS BOARD)	6600-094	Rev 9.60B+	Active
2005 – 2008 Spring (880 Maxxus)	6600-155	EPROM 9.61A+	Discontinued → 6600-392
Spring 2008 – 2011 (880 Maxxus)	6600-160	—	Discontinued → 6600-392
2011 – 2015 (880 Maxxus/Aspen)	6600-398	—	Discontinued → 6600-392
2005 – 2015+ (current 880 3-pump)	6600-392	IC Processor Rev 3.1A+	Active (successor for 2005+ Maxxus/Aspen)

Sibling Board on the 850 NT Platform

Part Number	Configuration	EPROM	Notes
6600-092	850 NT 1 or 2 pump with PermaClear®	Rev 9.50B+	2002 – 2005; sibling to 6600-094 on the same 850 NT platform

Compatible Topside Panel

Part Number	Description
Sundance® 6600-866	3-pump gray 850 Maxxus Control Panel for 3-Pump Systems (~12.5″ × 4.5″, with overlay for 2001+ model year spas)

Companion Components

Component	Part Number	Notes
Power Transformer	6560-274	240 VAC – 12 VAC, Sundance® 600/750/800/850/Portofino/Sweetwater/Del Sol system boards
Temperature Sensor	6600-167	Box End Connectors, includes O-ring 6540-228
Hi-Limit Sensor	6600-110	For 400/600/800/1992 Suncoast/Suntub systems with High Flow Heater

NOT Compatible — Use a Different Board

Your spa	Correct Replacement
❌ 2005+ Sundance® Maxxus® or Aspen® 3-pump	6600-392 (current 880 Maxxus/Aspen 3-pump with Smart Logic)
❌ Sundance® 850 NT 1 or 2 pump with PermaClear® (2002 – 2005)	6600-092 (or its current replacements 6600-728 / 6600-730 depending on spa configuration)
❌ Original 850 Series 3-pump with ISO-Pure salt (1999 – 2001) AND customer wants to retain salt system	Salt system cannot be retained; 6600-094 is the only current option but drops ISO-Pure support
❌ Sundance® 880 LCD Series (2005 – Mid 12/2009)	6600-728 (1-speed P1) or 6600-730 (2-speed P1)
❌ Sundance® 880 NT 2-pump (2008 – 2015)	6600-390
❌ Sundance® 880 SunTouch™ (2016 – 03/2018)	6600-779
❌ Sundance® post-SunTouch™ (04/2018+)	6600-386
❌ Sundance® 680 / 780 Series	6600-720 (no circ) or 6600-726 (with circ)
❌ Jacuzzi® J-Series (J-200 / J-300 / J-400 / J-LX / J-LXL)	Different J-Series board required

🎛️ Board Functions & Platform Notes

850 NT (New Technology) Platform

The 850 NT is a specific Sundance® control architecture in production 2002–2005 that introduced the 9.xx EPROM family. It sits between two distinct platform generations:

• Before 850 NT: Original 850 Series with 1.xx EPROMs (6600-017/018/023/028 family — same physical PCB, different EPROMs)
• 850 NT (2002–2005): 6600-092 (1 or 2 pump with PermaClear®) / 6600-094 (3-pump Maxxus®) — 9.50B / 9.60B EPROMs
• After 850 NT: 880 LCD Series (6600-728 / 6600-730 current replacements), 880 NT (6600-390 / 6600-392), 880 SunTouch™ (6600-779), Post-SunTouch™ (6600-386)

The 850 NT platform’s 9.xx EPROM architecture is NOT interchangeable with the earlier 1.xx family or the later 880-generation boards.

Controlled Outputs (This Board)

Output	Function
Pump 1	Primary jet pump (2-speed on Maxxus®)
Pump 2	Secondary jet pump (note: 2nd pump relay is external to the board per Sundance® 1999+ Maxxus® specification)
Pump 3	Tertiary jet pump (Maxxus® 3-pump configuration)
Circulation Pump	24-hour circulation pump for continuous filtration
Heater	850 Series flow-through heater (per spa’s installed heater)
PermaClear® Ozone	Supported (drives factory PermaClear® system)
Spa Lighting	OEM Maxxus® lighting
Topside Interface	Sundance® 6600-866 3-pump Maxxus® control panel

🛠️ Installation Requirements

⚠️ IMPORTANT: Hot tub circuit board installation must be performed by a licensed electrician in compliance with NEC (National Electrical Code) Article 680 and all local codes. A permit may be required in your jurisdiction. Maxxus® spas are high-demand 3-pump units with significant electrical requirements — verify circuit sizing before starting.

Pre-Installation Checklist

• [ ] Confirm your spa is a Sundance® Maxxus® 850 NT manufactured 2002–2004
• [ ] Confirm your spa has a 3-pump configuration (Pump 1, Pump 2, Pump 3)
• [ ] Confirm your spa has PermaClear® ozone sanitation
• [ ] Confirm your spa has a dedicated 24-hour circulation pump
• [ ] Check for ISO-Pure salt generator — if your existing spa has an ISO-Pure salt system (original 6600-023 board with 1.30B/1.30D EPROM), the 6600-094 will NOT retain this functionality. Plan to convert to non-salt sanitation (the PermaClear® ozone continues to function).
• [ ] Note your existing board’s part number and EPROM revision
• [ ] Disconnect all power at the main breaker and the external GFCI disconnect box
• [ ] Wait at least 5 minutes for capacitors to fully discharge
• [ ] Photograph every wire, harness, and connector position before removing the old board
• [ ] Verify location of the external 2nd pump relay in your spa pack (per 1999+ Maxxus® spec, not on the circuit board itself)
• [ ] Inspect the PermaClear® ozone module, circulation pump, all three jet pumps, hi-limit sensor, and temperature sensor — given the age of these spas (20+ years), related component replacement is often advisable at the same time

Electrical Requirements (US)

Requirement	Specification
Supply Voltage	Per spa data plate (typically 240 V / 60 Hz for US Maxxus® 3-pump)
Frequency	60 Hz (US standard)
GFCI Protection	Required (NEC Article 680)
Ground / Bonding	Mandatory equipment grounding and bonding per NEC Article 680
Dedicated Circuit	Required
Disconnect Box	Required within line of sight of spa (per NEC)
Wire Gauge	Per spa data plate and NEC ampacity tables (Maxxus® 3-pump configurations typically require 50 A+ service)

💡 Installation tip: Maxxus® 3-pump spas have a significant amperage demand when all three pumps run simultaneously with the heater. Verify your GFCI subpanel and service wiring are sized appropriately per the spa’s data plate BEFORE energizing the new board. Undersized wiring is a common cause of nuisance tripping on Maxxus® spas.

⚠️ Safety Warnings

Electrical Safety

• ⚠️ ALWAYS disconnect power at both the main breaker and the exterior GFCI disconnect box before any work
• ⚠️ Licensed electrician only — NEC Article 680 and most US local codes require it
• ⚠️ Verify GFCI protection is installed and tested
• ⚠️ Equipment grounding and bonding must comply with NEC Article 680
• ⚠️ Never operate the spa with the electrical compartment cover removed
• ⚠️ Verify external 2nd pump relay is functional — on 1999+ Maxxus® platforms, this relay is not on the PCB

Platform / Compatibility Safety

• ⚠️ Do NOT install the 6600-094 on a spa with an ISO-Pure salt generator expecting salt functionality — the 6600-094 DOES NOT support ISO-Pure. The salt generator will need to be disabled and an alternate sanitation method used (PermaClear® ozone remains functional).
• ⚠️ Do NOT install the 6600-094 on a 2005+ Maxxus® or Aspen® — use the 6600-392 (current 880 Maxxus/Aspen 3-pump board).
• ⚠️ Do NOT install the 6600-094 on a 1- or 2-pump 850 NT spa — use the 6600-092 or its current replacements (6600-728 / 6600-730) depending on spa configuration.

Water & Electrical Safety

• ⚠️ Ensure no water ingress into the control box during installation
• ⚠️ Inspect all gaskets and seals; replace if damaged (age-related gasket failure common on spas 20+ years old)
• ⚠️ Never touch any electrical component with wet hands

Post-Installation

• ⚠️ Verify the 6600-866 topside panel displays correctly on first power-up
• ⚠️ Confirm all 3 pumps operate correctly on both speeds (Pump 1) and single speed (Pumps 2 and 3)
• ⚠️ Confirm the circulation pump starts and runs on its programmed schedule
• ⚠️ Verify the PermaClear® ozone module activates during filter cycles
• ⚠️ Test the hi-limit function and GFCI trip before allowing bathers in the spa
• ⚠️ Monitor for error codes or unusual pump/heater behavior during the first 24 hours of operation

🔍 Error Codes & Troubleshooting

Common Indicator Behaviors (Sundance® 850 NT Maxxus® Platform)

Code	Meaning	Basic Troubleshooting
FLO	Pressure / flow switch fault	Clean filter; check plumbing blockages; inspect flow switch
OH / OHH / OHS	Overheating detected	Allow water to cool; verify circulation pump flow; check temperature sensor
Sn1	Hi-limit sensor malfunction	Check sensor 6600-110 connection; reset spa; replace sensor if faulty
Sn3	Heater deactivated	Inspect heater breaker; test heater element continuity; check temperature sensor 6600-167
TH1 / TH2 / TH3	Temperature probe failure	Test sensor resistance; replace temperature sensor (6600-167)
ICE	Freeze-risk condition detected	Verify heater function; raise setpoint; check ambient temperature
Cool	Water temperature more than 20°F below setpoint	Verify heater operation; confirm heater breaker
Pump 2 or Pump 3 not responding	External pump relay fault or topside command issue	Inspect external 2nd pump relay (Maxxus® 1999+ spec); verify topside 6600-866 button response

⚠️ Fault code behavior may vary based on the specific Maxxus® model year and topside firmware. Consult your spa’s owner’s manual for model-specific diagnostics.

🎯 Ideal Applications

Application	Suitability	Notes
♨️ 2002–2004 Sundance® Maxxus® 850 NT replacing a failed 6600-094 board	✅ Direct OEM replacement	Same platform, current EPROM Rev 9.60B+
♨️ 2001 Sundance® Maxxus® with discontinued 6600-057 board	✅ OEM upgrade replacement	Platform-compatible current option
♨️ 1999–2001 Sundance® Maxxus® 850 with discontinued 6600-023 (ISO-Pure salt)	⚠️ Platform-compatible but LOSES salt function	Customer must switch sanitation method; PermaClear® ozone remains functional
🛁 2005+ Maxxus® or Aspen® 3-pump	❌ Not compatible	Use 6600-392 instead
🛁 850 NT 1 or 2 pump spa	❌ Not compatible	Use 6600-092 (or current 6600-728 / 6600-730)
🛁 880 Series, 680 / 780 Series, or J-Series spa	❌ Not compatible	Use the appropriate platform board

🤔 Frequently Asked Questions

Q: My spa is a 2003 Sundance® Maxxus®. Is the 6600-094 the right board? A: Yes, if your 2003 Maxxus® is on the 850 NT platform (which is the standard for this production year) with 3-pump configuration, PermaClear® ozone, and a 24-hour circulation pump. Verify your existing board’s part number is 6600-094 (or the older 6600-023 / 6600-057 which are now discontinued and replaced by the 6600-094).

Q: My existing board is a 6600-023 with ISO-Pure salt generator. Will the 6600-094 maintain my salt system? A: No. This is a critical distinction. The 6600-094 replaces the 6600-023, but does NOT include ISO-Pure salt-generator support. If you install the 6600-094, your ISO-Pure salt generator will no longer function. You will need to switch to a non-salt sanitation method. The PermaClear® ozone system built into your Maxxus® spa will continue to function normally with the 6600-094.

Q: What happened to my old 6600-023 board’s salt generator function? A: Sundance® discontinued ISO-Pure salt-generator support when they introduced the 850 NT platform (6600-094) in 2002. No current OEM board supports ISO-Pure. If maintaining a salt system is a requirement, you would need to use a third-party salt system separate from the spa’s control board — consult a qualified spa technician.

Q: My existing board is a 6600-057. Is the 6600-094 the right replacement? A: Yes. The 6600-057 was a 2001 transitional Maxxus® PermaClear® 3-pump board (EPROM Rev 1.30D+) that has been discontinued. The current OEM replacement is the 6600-094 (EPROM Rev 9.60B+).

Q: My spa is a 2005 Maxxus®. Is the 6600-094 the right board? A: No. In 2005, Sundance® transitioned Maxxus® to the 880 Series platform. 2005+ Maxxus® and Aspen® 3-pump spas use the 6600-392 (current OEM, which replaces 6600-155 / 6600-160 / 6600-398). Contact Parts4Tubs with your spa’s exact year and existing board part number to confirm.

Q: What platform is this board? A: The 6600-094 is the 850 NT (New Technology) platform — a specific 2002–2005 Sundance® control architecture that uses the 9.xx EPROM family. It’s distinct from the original 850 Series (6600-017/018/023/028 family with 1.xx EPROMs) and from the later 880 Series platforms (6600-728 / 6600-730 / 6600-390 / 6600-392 / 6600-779 / 6600-386).

Q: Is there a 1- or 2-pump version of this 850 NT board? A: Yes. The 6600-092 (EPROM Rev 9.50B+) is the 1- or 2-pump sibling on the same 850 NT platform, for 2002–2005 Sundance® 850 NT spas that aren’t the 3-pump Maxxus® configuration.

Q: Why does the description say “2nd pump relay is not on the circuit board”? A: Per Sundance® documentation for the 1999+ Maxxus® platform, the 2nd pump relay is located externally in the spa pack rather than on the PCB itself. This is a Maxxus®-specific design detail — verify this external relay is functional during installation and troubleshooting.

Q: What topside panel works with this board? A: The matching topside is the Sundance® 6600-866 — a 3-pump gray 850 Maxxus® Control Panel (~12.5″ × 4.5″) with an overlay for 2001+ model year spas. If your existing topside is a 6600-866 and is functional, you can keep it.

Q: Do I need a licensed electrician to install this? A: Yes. NEC Article 680 and most US local jurisdictions require a licensed electrician for all hot tub electrical work, and a permit may be required. Maxxus® 3-pump spas have particularly high electrical demand — verifying service capacity is important.

Q: Is this an OEM or aftermarket board? A: The 6600-094 is the genuine OEM Sundance® / Jacuzzi® replacement board, factory-new with the current EPROM Rev 9.60B+ installed.

Q: Is the board returnable if I order the wrong one? A: No. Per manufacturer policy, spa circuit boards are final sale and cannot be returned once purchased — regardless of whether the board has been installed. Confirming your spa year (2002–2004 for this specific board), configuration (3-pump Maxxus® with PermaClear®), and salt-system status (if any) before ordering is essential.

✅ Why Choose the 6600-094

• ✅ Genuine OEM Sundance® / Jacuzzi® replacement – factory-new with EPROM Rev 9.60B+
• ✅ Current replacement for the discontinued 6600-023 and 6600-057 Maxxus® boards
• ✅ Engineered for the high-demand Maxxus® 3-pump configuration
• ✅ Full PermaClear® ozone system support
• ✅ 24-hour circulation pump control
• ✅ Direct-fit mounting for 2002–2004 Maxxus® 850 NT equipment bays
• ✅ Backed by the Sundance® / Jacuzzi® manufacturer’s limited warranty

🇺🇸 Why Buy From Parts4Tubs

• ✅ US-based company with local support for Sundance® Maxxus® owners
• ✅ Fast US shipping
• ✅ Expert help identifying whether your Maxxus® spa is on the 850 NT platform (2002–2004, this board) or the later 880 Maxxus®/Aspen® platform (2005+, use 6600-392), and managing the ISO-Pure salt-generator transition for customers with 1999–2001 6600-023 spas
• ✅ Competitive pricing on current OEM boards
• ✅ Full manufacturer warranty support
• ✅ Matching companion parts in stock — 6600-866 topside panel, 6600-167 temperature sensor, 6600-110 hi-limit sensor, 6560-274 power transformer, and related 850 NT Maxxus® service parts
• ✅ Platform-history expertise across six generations of Sundance® 850/880 circuit boards (Original 850 Series → 850 NT → 850/880 LCD → 880 NT → 880 SunTouch™ → Post-SunTouch™)

⭐ Summary

The Sundance® / Jacuzzi® 6600-094 is the current OEM replacement circuit board for 2002–2004 Sundance® Maxxus® 850 NT Series 3-pump premium hot tubs equipped with PermaClear® ozone sanitation and a 24-hour circulation pump. Shipping with EPROM Rev 9.60B+, it replaces the discontinued 6600-023 (1999–2001 Maxxus® 850 with ISO-Pure salt generator — note: 6600-094 does NOT support ISO-Pure) and the discontinued 6600-057 (2001 Maxxus® with PermaClear®). The 6600-094 operates on the Sundance® 850 NT (New Technology) platform — distinct from the original 850 Series (6600-017/018/023/028 family) and from the later 880 platforms. For 2005+ Maxxus® or Aspen® 3-pump spas, use the successor 6600-392 instead. For 850 NT 1- or 2-pump configurations, use the sibling 6600-092. Pair with the Sundance® 6600-866 3-pump Maxxus® topside panel. Non-returnable; manufacturer’s limited warranty. Verify your spa’s year, configuration, and salt-system status 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.