🛠️ Sundance® / Jacuzzi® 6600-018 Original 850 Series Spa Circuit Board (1 or 2-Pump, No PermaClear®, No Circulation Pump)

The long-running OEM replacement PCB for 1995–1997 Sundance® 850 Series portable spas and 1993–present Sundance® 850 Series inground installations — 1 or 2 jet pumps, without PermaClear® ozone and without a dedicated 24-hour circulation pump.

📋 Product Overview

The Sundance® / Jacuzzi® 6600-018 is the OEM main circuit board for 1995–1997 Sundance® 850 Series portable hot tubs (Cameo®, Capri®, Corum®, Marin®, Optima®) configured without PermaClear® ozone sanitation and without a dedicated 24-hour circulation pump — and for 1993 through present-day Sundance® 850 Series inground installations that continue to use this foundational control architecture. Shipping with the current EPROM Revision 1.29E+, this board represents the 1.29-family chip within Sundance®’s original 850 Series platform, engineered for 1- or 2-pump jet configurations where neither PermaClear® ozone nor a Grundfos/Laing-type circulation pump is installed.

The 6600-018 is physically identical to the 6600-017, 6600-023, and 6600-028 boards — all four part numbers reference the same physical PCB with different EPROM chips programmed for different system configurations. The 1.29 EPROM family (6600-018) is specifically the no-circ, no-PermaClear® variant. It retrofits the earlier 6600-014 (1993 800 Series) board and represents one of the longest continuous OEM production runs in Sundance®’s history, remaining in active production today primarily for the inground installation market where the original 850 Series architecture is still specified.

⚠️ This board operates WITHOUT a circulation pump AND WITHOUT PermaClear® ozone sanitation. If your spa has either feature, this is the wrong board — see the Compatibility Guide below for the correct EPROM variant. ⚠️ The key identifier is the EPROM chip label on your existing board. If your chip’s revision number begins with “1.29” → the 6600-018 is correct. If your chip begins with “1.28E”, “1.28F”, or “1.28FB” → you have a circulation-pump system and need the 6600-017 instead.

✨ Key Features

• ✅ Genuine OEM Sundance® / Jacuzzi® replacement – factory-new with EPROM Rev 1.29E+ installed
• ✅ Original Sundance® 850 Series platform – engineered for the 1.27 / 1.28 / 1.29 EPROM-family control architecture
• ✅ 1-pump OR 2-pump configurations – covers both 850 Series jet-pump layouts without PermaClear®
• ✅ No circulation pump operation – for systems that do NOT have a dedicated 24-hour circ pump
• ✅ No PermaClear® ozone – for systems NOT equipped with PermaClear® sanitation
• ✅ 1995–1997 portable model coverage – Cameo® 850, Capri® 850, Corum® 850, Marin® 850, Optima® 850
• ✅ 1993–Present inground applications – long-running OEM board for legacy 850 Series inground installations
• ✅ Retrofits 6600-014 – replaces the original 1993 800 Series board
• ✅ Same physical PCB as 6600-017 / 6600-023 / 6600-028 – only the EPROM chip differs
• ✅ Non-returnable – spa circuit boards are final sale
• ✅ Covered by manufacturer’s limited warranty

🔧 Technical Specifications

Specification	Value
OEM Part Number	6600-018
Also Listed As	SD6600-018
Platform	Original Sundance® 850 Series (1.27 / 1.28 / 1.29 EPROM family)
Current EPROM Chip	Rev 1.29E+ (1.29 family)
Sanitation	Without PermaClear® ozone
Circulation Pump Support	❌ No — this board does NOT operate a 24-hour circulation pump
Pump Configuration	1-pump OR 2-pump (system-configured)
Portable Model Era	1995 – 1997 (850 Series)
Inground Model Era	1993 – Present (850 Series inground installations)
Retrofits	6600-014 (1993 800 Series)
Physical Identity	Same PCB as 6600-017, 6600-023, 6600-028 (different EPROMs only)
Non-Returnable	✅ Yes — final sale
Warranty	Manufacturer’s limited warranty

📌 Electrical supply voltage is spa-model-specific. 850 Series spas are typically configured for 240 V / 60 Hz service in the US market (with some 120 V convertible configurations on specific model-year combinations). The inground installation market in particular uses varied electrical configurations per site. Always verify against your spa’s data plate before connecting power. No universal voltage/amperage rating is published for the bare 6600-018 PCB by the manufacturer, because the configuration depends on the spa’s installed heater, pumps, and service supply.

🔍 EPROM Chip Identification — The Critical Step

The 6600-017, 6600-018, 6600-023, and 6600-028 are the same physical circuit board with different EPROM chips. Ordering the correct replacement depends entirely on identifying your existing board’s EPROM revision:

EPROM Starts With	Your System Has	Correct Replacement
1.27	1 or 2 pumps, no PermaClear®, no circ pump (1995 only)	Legacy — see 6600-018 as current substitute
1.28E, 1.28F, 1.28FB	1 or 2 pumps, WITH circulation pump, no PermaClear®	6600-017
1.28GX+	1997–2005 850 Series, WITH PermaClear®	6600-730 (current replacement for discontinued 6600-028)
1.28K	850 NT variant — DISCONTINUED	6600-730 (current replacement)
1.29 / 1.29E / 1.29E+	1 or 2 pumps, no PermaClear®, no circ pump	6600-018 ← THIS BOARD
1.30B	1999+ Maxxus with ISO-Pure (salt system) — DISCONTINUED	6600-094 (note: does not support salt system)
1.30D	1999–2001 Maxxus 3-pump with ISO-Pure — DISCONTINUED	6600-094 (note: does not support salt system)

💡 Where to find the EPROM chip: The EPROM is a small socketed integrated circuit on the board. Its top surface will have a paper or printed label showing the revision number (e.g., “REV 1.29E”). Always verify this label before ordering.

🔗 Compatibility Guide

Covered 1995–1997 Sundance® 850 Series Portable Models (No PermaClear®, No Circ Pump)

Model	Years	Notes
♨️ Cameo® 850	1995 – 1997	1 or 2 pumps, no PermaClear®, no circ pump
♨️ Capri® 850	1995 – 1997	1 or 2 pumps, no PermaClear®, no circ pump
♨️ Corum® 850	1995 – 1997	1 or 2 pumps, no PermaClear®, no circ pump
♨️ Marin® 850	1995 – 1997	1 or 2 pumps, no PermaClear®, no circ pump
♨️ Optima® 850	1995 – 1997	1 or 2 pumps, no PermaClear®, no circ pump

Extended Coverage — 850 Series Inground Installations

Application	Years	Notes
♨️ Sundance® 850 Series Inground	1993 – Present	Long-running OEM use — the 6600-018 continues as the current replacement for 850 Series inground installations that retain the original control architecture

Related Same-PCB Boards (Different EPROMs)

Part Number	EPROM	Configuration	Status
6600-017	Rev 1.28E / 1.28F / 1.28FB	WITH circulation pump	Active
6600-018 (THIS BOARD)	Rev 1.29E+	No circ pump, no PermaClear®	Active
6600-023	Rev 1.30B / 1.30D	1999–2001 Maxxus 3-pump with ISO-Pure	Discontinued — see 6600-094
6600-028	Rev 1.28GX+	1997–2005 850 Series with PermaClear®	Discontinued — see 6600-730

Predecessor Board

Part Number	Era	Notes
6600-014	1993 800 Series	Predecessor — the 6600-018 retrofits the 6600-014 in 1993 800 Series spas

NOT Compatible — Use a Different Board

Your spa	Correct Replacement
❌ Spa WITH a 24-hour circulation pump (EPROM chip starts with “1.28E”, “1.28F”, or “1.28FB”)	6600-017
❌ Spa WITH PermaClear® ozone (original EPROM “1.28GX+” or “1.28K”)	6600-730 (850 LCD 2-speed P1) or 6600-728 (880 LCD 1-speed P1)
❌ 1999+ Maxxus 3-Pump with ISO-Pure (EPROM “1.30B” or “1.30D”)	6600-094 (note: does not support ISO-Pure salt system)
❌ Post-Mid 12/2009 Sundance® 880 Series spas	6600-728 / 6600-730 / 6600-390 / 6600-392 / 6600-779 / 6600-386 depending on platform generation
❌ 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

Topside Panel Notes

Because the 6600-018 spans a wide production era (1995–1997 portable + 1993–Present inground), the correct topside panel depends on your specific spa’s model, year, and installation type. Legacy 1995–1997 portable 850 Series spas typically used topside panels from the 6600-803 (Dual Cable Harness) / 6600-835 / 6600-865 / 6600-866 family. Inground installations (1993 – Present) typically use inground-specific topsides such as the 6600-872 (40 ft cable harness, 2001+ 850/880 Series Inground). Match your topside by part number or contact Parts4Tubs with your spa’s model, year, and existing topside photos for confirmation.

🎛️ Board Functions & Platform Notes

Platform Classification

The 6600-018 is part of the Original Sundance® 850 Series control architecture — the foundational 850 Series platform introduced in 1993–1995 that used the 1.27 / 1.28 / 1.29 / 1.30 EPROM family. This is distinct from the later 850/880 LCD platform (1997–Mid 12/2009) that uses the 6600-728 / 6600-730 current replacements, and distinct again from the 880 NT (2008–2015), 880 SunTouch™ (2016–03/2018), and post-SunTouch™ (04/2018+) generations that followed.

Within the original 850 Series platform, the four EPROM variants (6600-017, 6600-018, 6600-023, 6600-028) correspond to different feature combinations:

Feature	6600-017	6600-018	6600-023	6600-028
Circulation pump	✅ Yes	❌ No	—	✅ Yes
PermaClear® ozone	❌ No	❌ No	—	✅ Yes
ISO-Pure salt system	❌ No	❌ No	✅ Yes (Maxxus)	❌ No
Pump count	1 or 2	1 or 2	3 (Maxxus)	1 or 2

Controlled Outputs (This Board)

Output	Function
Pump 1	Primary jet pump (per 850 Series factory configuration)
Pump 2	Secondary jet pump (for 2-pump configurations)
Heater	850 Series flow-through heater (per spa’s installed heater)
Spa Lighting	OEM 850 Series lighting
Topside Interface	Legacy 850 Series topside communication

🛠️ Installation Requirements

Pre-Installation Checklist

• [ ] Identify your existing EPROM chip — remove the cover on your existing board and read the revision number on the EPROM chip label. If it does NOT start with “1.29”, this is likely the wrong board for your spa.
• [ ] Confirm your spa has NO dedicated 24-hour circulation pump (a small continuous pump like a Grundfos® or Laing® — separate from the main jet pumps)
• [ ] Confirm your spa does NOT have PermaClear® ozone sanitation
• [ ] Note your spa’s pump count (1-pump or 2-pump)
• [ ] Note your existing board’s part number and your topside panel’s part number
• [ ] 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
• [ ] Inspect the temperature and hi-limit sensors — given the age of these spas, sensor replacement is often advisable at the same time
• [ ] For inground installations: verify access to all electrical components before starting; inground spa electrical work often requires inspection

Electrical Requirements (US)

Requirement	Specification
Supply Voltage	Per spa data plate (typically 240 V / 60 Hz for US 850 Series)
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

💡 Installation tip for 1995–1997 portable 850 Series spas: These are 30-year-old spas. When replacing the circuit board, also inspect the topside panel cable, temperature sensors, hi-limit sensor, and heater element. Age-related failures in any of these components can mimic a board fault after the new board is installed.

💡 Installation tip for inground installations: Many 850 Series inground spas have their equipment bay remote from the spa itself. Ensure all wire harnesses are labeled and photographed before disconnection — replacement wiring runs can be significant.

⚠️ 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

EPROM / Platform Safety

• ⚠️ Do NOT install the 6600-018 on a spa with a circulation pump — order 6600-017 instead. The 1.29 EPROM does not drive circ-pump logic.
• ⚠️ Do NOT install the 6600-018 on a spa with PermaClear® ozone — a different board is required.
• ⚠️ Do NOT install the 6600-018 on a Maxxus 3-pump — the original Maxxus boards (6600-023) are discontinued; use 6600-094.
• ⚠️ Always verify your EPROM chip label before ordering. The four same-PCB boards (6600-017/018/023/028) are visually indistinguishable.

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 is common on spas this vintage)
• ⚠️ Never touch any electrical component with wet hands

Post-Installation

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

🔍 Error Codes & Troubleshooting

Common Indicator Behaviors (Legacy 850 Series)

The original 850 Series platform predates modern alphanumeric fault codes on the topside. Common failure indicators include:

Symptom	Likely Cause	Basic Check
Display blank or showing “—“	Power / topside communication fault	Check GFCI; verify topside cable
Heater not heating	Heater element or hi-limit sensor fault	Test heater element continuity; verify hi-limit sensor
Pumps running erratically	Relay fault on board; topside command issue	Test relay operation; verify topside button response
Spa tripping breaker	Voltage configuration or GFCI fault	Verify 240 V setting; check GFCI continuity
Dim or flickering display	Transformer or supply voltage fault	Verify supply voltage at board terminal

⚠️ Specific fault behavior varies by spa model, topside panel, and EPROM revision. Consult your spa’s owner’s manual if available, or contact Parts4Tubs for diagnostic support on legacy 850 Series spas.

🎯 Ideal Applications

Application	Suitability	Notes
♨️ 1995–1997 Sundance® 850 Cameo®, Capri®, Corum®, Marin®, or Optima® (1 or 2 pumps, no PermaClear®, no circ)	✅ Direct OEM replacement	Verify EPROM Rev 1.29 family on existing board
♨️ 1993–Present Sundance® 850 Series Inground installation	✅ Direct OEM replacement	Long-running OEM board for this application
♨️ Legacy 1993 800 Series with 6600-014 board	✅ Retrofit replacement	6600-018 retrofits the original 6600-014
🛁 Spa with a Grundfos® or Laing® circulation pump	❌ Not compatible	Use 6600-017
🛁 Spa with PermaClear® ozone	❌ Not compatible	Use 6600-730
🛁 1999+ Maxxus 3-Pump (ISO-Pure)	❌ Not compatible	Use 6600-094 (no ISO-Pure salt support)
🛁 Newer Sundance® 880 Series (post-2005)	❌ Not compatible	Use the appropriate 880 Series board per platform

🤔 Frequently Asked Questions

Q: My existing board is labeled 6600-018, but the EPROM chip says “1.28FB”. Which board do I actually need? A: If your EPROM chip shows 1.28FB, you have a circulation-pump system and you need the 6600-017, not the 6600-018. The 6600-017, 6600-018, 6600-023, and 6600-028 are all the same physical PCB — the EPROM chip determines which system configuration the board is programmed for. The 1.28FB chip is specifically for circulation-pump systems.

Q: My chip says “REV 1.29E”. Is the 6600-018 the right board? A: Yes. EPROM chips starting with “1.29” (including 1.29, 1.29E, 1.29E+) are the no-circ-pump, no-PermaClear® variant — the 6600-018 is correct.

Q: What’s the difference between a 6600-018 and a 6600-017? A: The two boards are physically identical — same PCB, same components, same mounting footprint. Only the EPROM chip is different:

• 6600-017 — EPROM Rev 1.28E / 1.28F / 1.28FB → drives a circulation pump
• 6600-018 — EPROM Rev 1.29E+ → no circulation pump

You cannot use a 6600-018 in a spa that has a circulation pump, and vice versa.

Q: My spa is an inground 850 installed in 1998. Does the 6600-018 still work? A: Yes, if your inground spa was configured without a circulation pump and without PermaClear® ozone. The 6600-018 has been in active OEM production since 1993 for 850 Series inground applications, which have used the original platform architecture continuously. Verify the EPROM on your existing board — if it starts with “1.29”, the 6600-018 is correct.

Q: Is this the same as a 6600-730 board? A: No. The 6600-730 is a different, newer board for the 850/880 LCD platform (1997 – Mid 12/2009 portable spas with PermaClear® and a 2-speed Pump 1). The 6600-018 is the original 850 Series board (1.29 EPROM family) for 1995–1997 portable spas and 1993 – Present inground installations — a different platform entirely.

Q: Can I convert my 6600-018 spa to add a circulation pump? A: A 6600-018 board will not drive a circulation pump — the 1.29 EPROM does not include circ-pump logic. To add a circ pump, you would need to install a 6600-017 board (with the 1.28E/F/FB EPROM) AND physically install a circulation pump. This is a significant modification and should be done by a qualified spa technician.

Q: My board is labeled “6600-028” — is it the same as a 6600-018? A: Physically yes (same PCB), but the 6600-028 is the PermaClear® ozone variant (EPROM Rev 1.28GX+) and is discontinued. If you have a 6600-028 board and a PermaClear® system, the current OEM replacement is the 6600-730, not the 6600-018.

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 — especially for inground installations. Improper installation can cause fire, electrocution, or equipment damage.

Q: Is this an OEM or aftermarket board? A: The 6600-018 is the genuine OEM Sundance® / Jacuzzi® replacement board, factory-new with the current EPROM Rev 1.29E+ 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. Given that four same-physical-PCB boards (6600-017 / 6600-018 / 6600-023 / 6600-028) are distinguished only by their EPROM chip, verifying your existing EPROM revision before ordering is absolutely essential.

✅ Why Choose the 6600-018

• ✅ Genuine OEM Sundance® / Jacuzzi® replacement – factory-new with current EPROM Rev 1.29E+
• ✅ One of Sundance®’s longest continuous OEM production runs (1993 – Present for inground)
• ✅ Direct-fit retrofit for 1995–1997 portable 850 Series Cameo®, Capri®, Corum®, Marin®, Optima®
• ✅ Direct-fit replacement for 850 Series inground installations manufactured 1993 – Present
• ✅ Retrofits the earlier 6600-014 (1993 800 Series) board
• ✅ Same physical footprint as the 6600-017 / 6600-023 / 6600-028 — EPROM-specific feature set
• ✅ Backed by the Sundance® / Jacuzzi® manufacturer’s limited warranty

🇺🇸 Why Buy From Parts4Tubs

• ✅ US-based company with local support for Sundance® and Jacuzzi® spa owners
• ✅ Fast US shipping
• ✅ Expert EPROM identification help — the single most important step when ordering a 6600-017 / 6600-018 / 6600-023 / 6600-028 board. Send us a photo of your existing EPROM chip and we will confirm the correct replacement before you order.
• ✅ Competitive pricing on current OEM boards
• ✅ Full manufacturer warranty support
• ✅ Platform-history expertise — we can help identify whether your 850/880 Series spa is on the original 850 Series platform (6600-017 / 6600-018 era), the 850/880 LCD platform (6600-728 / 6600-730), the 880 NT platform (6600-390 / 6600-392), the 880 SunTouch™ platform (6600-779), or the post-SunTouch™ generation (6600-386)
• ✅ Legacy 850 Series inground installation support

⭐ Summary

The Sundance® / Jacuzzi® 6600-018 is the OEM replacement circuit board for 1995–1997 Sundance® 850 Series portable hot tubs (Cameo®, Capri®, Corum®, Marin®, Optima®) and 1993–present 850 Series inground installations, configured with 1 or 2 jet pumps, no PermaClear® ozone, and no dedicated 24-hour circulation pump. Ships with the current EPROM Revision 1.29E+ — the 1.29-family chip that identifies this no-circ, no-PermaClear® configuration. The 6600-018 is the same physical PCB as the 6600-017 (with circ pump, 1.28E/F/FB EPROM), 6600-023 (Maxxus 3-pump with ISO-Pure, discontinued), and 6600-028 (with PermaClear®, discontinued — replaced by 6600-730), distinguished only by the EPROM chip. Retrofits the earlier 6600-014 (1993 800 Series) board. Verify your EPROM chip revision before ordering — if it does not start with “1.29”, this is the wrong board for your spa. Non-returnable; manufacturer’s limited warranty.

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.