⚡ Balboa BP7 Spa Circuit Board (Main PCB) — G1361-02

Professional-grade replacement circuit board for reliable spa control and performance

💧 Product Overview

The Balboa BP7 Main Circuit Board (G1361-02) is a genuine Balboa Water Group replacement PCB designed for spa control systems built on the BP7 platform. This is the main logic board at the heart of the Balboa BP7 control system — governing pump operation, heater management, temperature control, lighting, ozone, and filtration cycles all from a single, precision-engineered board.

The BP7 is Balboa’s most versatile aftermarket control board, capable of supporting up to four pumps (Pump 1 through Pump 4), a dedicated circulation pump, blower, ozone generator, spa light, and optional MicroSilk® air injection. With 32 software-selectable setup configurations, it adapts to an exceptionally wide range of spa designs and equipment combinations.

Compatible with all major Balboa topside control panels — including the TP500, TP600, TP800, TP900, and full spaTouch® series — this board is the go-to replacement for technicians and spa owners upgrading or restoring spas that originally ran on a Balboa BP-series control system (including the BP501 and BP2000). It also supports optional ControlMySpa Wi-Fi connectivity, Balboa Bluetooth Audio (bba™2/bba™3), CHROMAZON3™ color lighting, and Clim8zone™ heat pump integration.

✨ Key Features

✅ Genuine Balboa Water Group PCB — OEM main circuit board (G1361-02) for the BP7 control system; part of the BP1800 board platform engineered for aftermarket use

✅ Up to Four Pump Outputs — Supports Pump 1 (2-Speed, 12A max), Pump 2 (2-Speed, 12A max), Pump 3 (1-Speed, 12A max), and Pump 4 (1-Speed, 10A max) depending on setup selection

✅ Dedicated Circulation Pump Output — 240VAC (convertible to 120V), 2A max; programmable filtration cycles with polling support for continuous water quality maintenance

✅ Heater Control Ready — Compatible with 4.0kW and 5.5kW Balboa Incoloy heater assemblies at 240VAC; hi-limit and dry-heater sensor protection built in

✅ 32 Software Setup Configurations — Selectable via DIP switch and topside panel to match virtually any spa equipment combination; shipped in Setup #21 by default

✅ Wide Topside Panel Compatibility — Works with TP200T/W, TP400T/W, TP500/TP500S, TP600, TP700/TP740, TP800, TP900, Icon spaTouch™, Menued spaTouch™, spaTouch™2, and spaTouch™3

✅ Integrated Safety Features — Class A GFCI trip detection, freeze protection (activates at 44°F / 6.7°C), hi-limit sensor monitoring, heater dry-detection circuit

✅ Smart Add-On Support — Optional Wi-Fi module for ControlMySpa app control; Balboa Bluetooth Audio (bba™2/bba™3); CHROMAZON3™ LED color control; Clim8zone™ heat pump compatibility

✅ UL Listed Control System — UL System Models BP20-BP7-AU (5.5kW) and BP20-BP7-AS (4.0kW); designed and certified for North American 240VAC/60Hz electrical service

✅ 1-Year Manufacturer Warranty — Backed by Balboa Water Group’s standard 1-year warranty on PCB components

⚙️ Technical Specifications

Specification	Value
Manufacturer Part Number	G1361-02
Board Platform	BP1800 (Balboa BP7 System)
Board Type	Main PCB / Logic Board
Input Voltage	240VAC
Frequency	60Hz (UL / North American system; auto-detects 50/60Hz)
Maximum Service Amperage	48A
Circuit Breaker Rating	60A maximum
Wiring Configuration	4-wire: Hot, Hot, Neutral, Ground (or 3-wire dedicated: Hot, Hot, Ground)
Minimum Wire Gauge	#6 AWG copper, 90°C rated
Terminal Block Torque	27–30 in. lbs. (31.1–34.5 kg cm)
Pump 1 Output	240VAC, 2-Speed, 12A max
Pump 2 Output	240VAC, 2-Speed, 12A max (10A max in Setups 30–32 combined)
Pump 3 Output	240VAC, 1-Speed, 12A max (via J14 Aux connector)
Pump 4 Output	240VAC, 1-Speed, 10A max (via Expander Board; Setups 30–32 only)
Circulation Pump Output	240VAC (or 120V by conversion), 1-Speed, 2A max
Blower Output	240VAC, 1-Speed, 4A max (Setups 1–8)
MicroSilk® Output	240VAC, 1-Speed, 8A max (Setups 22–29)
Ozone Output	240VAC (or 120V with circ pump), 0.5A max
Spa Light Output	10VAC, 2A max (shared with CHROMAZON3™)
AV / Clim8zone™ Output	240VAC, 2A + 8A max (J33)
Heater Compatibility	4.0kW @ 240VAC and 5.5kW @ 240VAC Incoloy heaters
Software Setups	32 selectable setups
Software Version	M100_221 V65.0
Hi-Range Temperature	80°F–104°F (26.7°C–40°C)
Lo-Range Temperature	50°F–99°F (10°C–37.2°C)
Freeze Protection Threshold	44°F (6.7°C)
Heater Flow Requirement	Minimum 20 GPM through heater
GFCI	Class A GFCI required; internal GFCI trip detection supported
Certifications	UL (System Models BP20-BP7-AU and BP20-BP7-AS)
Warranty	1 Year (Balboa Water Group)
Physical Dimensions	Please refer to manufacturer documentation or contact Parts4Tubs
Operating Temperature Range	Please refer to manufacturer documentation or contact Parts4Tubs

🔗 Compatibility Guide

Compatible Balboa Control Systems (Board Replaces):

OEM Part Number	Description
G4361 / G4361-01 / G4361-02	Balboa BP7 System — 4.0kW 800 Incoloy
G5361 / G5361-01 / G5361-02	Balboa BP7 System — 5.5kW 800 Incoloy
G5369	Balboa BP7 variant
51-G4361-K	Balboa BP7 Kit
G6405-01 / 50-B7-500-40-K	Balboa BP7 Kit with TP500 Topside
G6406 / 50-B7-600-40-K	Balboa BP7 Kit with TP600 Topside
BP7R3C	Balboa BP7 chip revision
BP501 (G1351)	Prior-generation Balboa control board

Cross-Reference Part Numbers:

Part Number	Source
G1361-02	Balboa Water Group (manufacturer)
G1361	Balboa Water Group (original revision)
G1361-01	Balboa Water Group (interim revision)
33-G1361-K	Balboa kit variation

Compatible Topside Control Panels:

Panel Model	Notes
spaTouch™3	Any version (v3.2+ for Clim8zone™ support)
spaTouch™2	Any version (v2.19+ for CHROMAZON3™; v2.36+ for Clim8zone™)
Icon spaTouch™	Any version (v3.36+ for bba™2 full integration)
Menued spaTouch™	Any version (v2.8+ for bba™2)
TP900	Version 3.1 and later
TP800	Version 3.1 and later
TP700 / TP740	Any version (v1.27+ for Clim8zone™)
TP600	Version 2.7 and later
TP500 / TP500S	Any version
TP400T (US)	Version 2.7 and later
TP400W (US)	Version 2.7 and later
TP200T	Any version
TP200W	Any version

⚠️ Important: Always match your existing board’s part number before ordering. Circuit boards are not “plug-and-play” — correct DIP switch configuration, jumper settings, and voltage setup are required. Do not select a board based on appearance alone.

🎛️ Board Functions & Controls

Pump Control

Output	Connector	Function	Rating	Setup Availability
Pump 1	J9	Main jet pump (2-Speed or 1-Speed)	240VAC, 12A max	All setups
Pump 2	J1 (Expander)	Secondary jets (2-Speed or 1-Speed)	240VAC, 12A max	Most setups
Pump 3	J14	Third pump or blower (1-Speed)	240VAC, 12A max	Setups 9–11, 17–18, 30–32
Pump 4	J1 (Expander + Splitter)	Fourth pump (1-Speed)	240VAC, 10A max	Setups 30–32 only
Circ Pump	J21	Dedicated circulation / heater pump	240VAC (or 120V), 2A max	Circ setups (1–5, 9–16, 22–26, 30–31)
Blower	J14	Air blower (1-Speed)	240VAC, 4A max	Setups 1–8

Heater Control

Feature	Specification
Heater Type	Balboa Incoloy electric element (Plug-n-Click or standard)
4.0kW Version	Heater Kit G7412 @ 240VAC
5.5kW Version	Heater Kit G7512 @ 240VAC
Hi-Range Set Temp	80°F–104°F (26.7°C–40°C)
Lo-Range Set Temp	50°F–99°F (10°C–37.2°C)
Hi-Limit Protection	Built-in via Sensor A and Sensor B
Dry Heater Protection	Built-in; triggers “dr” warning, then “drY” lockout
Minimum Flow	20 GPM through heater required

Additional Outputs & Features

Function	Connector	Capability
Spa Light	J15	10VAC, 2A max; 240-minute auto-timer
Ozone	J32	0.5A max; slaved to circ pump or independent
AV / Clim8zone™	J33	240VAC, 2A + 8A max; optional splitter PN 22934
MicroSilk®	J14	240VAC, 8A max; Setups 22–29
Wi-Fi Module	J34 or J35 (MAIN)	Optional ControlMySpa module
Aux Panels	J5 (Bank 1)	AX10, AX20, AX40 auxiliary panels supported
Freeze Protection	Automatic	Activates at 44°F (6.7°C); rotates pumps at lowest speed

Software Setups (Selected Examples)

Setup #	Circ Pump	Pump 1	Pump 2	Pump 3	Blower
1	Yes	2-Speed	2-Speed	—	1-Speed
4	Yes	2-Speed	—	—	1-Speed
9	Yes	2-Speed	2-Speed	1-Speed	—
12	Yes	2-Speed	2-Speed	—	—
21	—	2-Speed	—	—	—
22	Yes	2-Speed	2-Speed	—	MicroSilk®
30	Yes	2-Speed	1-Speed	1-Speed	(+ Pump 4)

💡 Default: The board ships in Setup #21. A technician must select the correct setup to match the spa’s pump and equipment configuration. Changing the setup may require wiring changes — always refer to the wiring diagram.

🔧 Installation Requirements

⚠️ IMPORTANT: Electrical installation must be performed by a licensed electrician in full compliance with the National Electrical Code (NEC) Article 680 and all applicable local codes.

Pre-Installation Checklist

• [ ] Verify part number matches your existing BP7 main circuit board
• [ ] Disconnect ALL power at the circuit breaker and GFCI disconnect before beginning
• [ ] Photograph all wiring and connector positions before removing the old board
• [ ] Label each connector with its corresponding location
• [ ] Allow capacitors to discharge — wait at least 5 minutes after power-off
• [ ] Note the current Setup number from the label inside the system lid
• [ ] Confirm the heater size (4.0kW or 5.5kW) and adjust jumper J24 accordingly

Electrical Requirements

Requirement	Specification
Supply Voltage	240VAC / 60Hz
Circuit Breaker	60A maximum (sized per NEC Table 310-16)
GFCI Protection	Class A GFCI required — per NEC Article 680-42
Ground Connection	Equipment grounding AND bonding required (NEC Article 680)
Bonding Conductor	Solid copper bonding wire to all metal within 5 ft of spa
Minimum Wire Gauge	#6 AWG copper, 90°C rated minimum
Dedicated Circuit	Required
Disconnect	Required within line of sight of spa, at least 5 ft from water (NEC)
Conductor Sizing	Size per NEC Table 310-16 based on 60°C ampacity, rated minimum 90°C

Key Connectors & Jumpers

Connector / Jumper	Function
TB1 (Terminal Block)	Main power input; torque 27–30 in. lbs.
J9	Pump 1 output (main board)
J21	Circulation pump output
J14	Blower / Pump 3 / MicroSilk® (setup-dependent)
J15	Spa light output (10VAC)
J32	Ozone output
J33	AV + Clim8zone™ output
J1 (Expander X-P332)	Pump 2 and Pump 4 outputs
J34 / J35 (MAIN)	Topside panel connection
J24	Heater voltage jumper (center pins = 240V; outer pins = 120V)
J29	Heater disable switch input
S1 (DIP Switchbank)	10-position switchbank for amperage and test mode configuration

💡 Tip: Use a permanent marker to write the Setup number on the label inside the system lid — this is essential for any future board replacement or service call.

⚠️ Circ Pump & Ozone must always be the same voltage — both 240V or both 120V.

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🛡️ Safety Warnings

Electrical Safety:

• ⚠️ ALWAYS disconnect ALL power at the breaker and GFCI before touching any wiring
• ⚠️ Installation MUST be performed by a licensed electrician only
• ⚠️ This board requires 240VAC / 60Hz North American electrical service — verify before connecting
• ⚠️ Class A GFCI protection is mandatory per NEC Article 680-42 — never bypass
• ⚠️ All wiring must comply with NEC Article 680 and applicable local electrical codes
• ⚠️ Use copper conductors ONLY — aluminum conductors are prohibited
• ⚠️ A dedicated circuit and disconnect within line of sight of the spa are required by NEC
• ⚠️ Never operate spa with covers removed from the electrical control enclosure

Water & Electrical Safety:

• ⚠️ Do not allow water ingress into the control box — inspect seals and gaskets during installation
• ⚠️ Never touch electrical components with wet hands or while standing in water
• ⚠️ Ensure bonding conductor connects all metal components within 5 feet of the spa

DIP Switch & Jumper Safety:

• ⚠️ Incorrect DIP switch or jumper settings can cause abnormal system behavior or component damage
• ⚠️ Setting J24 to the wrong position for the heater voltage WILL damage the heater

Post-Installation:

• ⚠️ Test all safety features — GFCI, hi-limit sensor, and freeze protection — before first use
• ⚠️ Run through Priming Mode and verify all pumps are primed before heater activation
• ⚠️ Check the topside display for any error codes on initial startup

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🔍 Error Codes & Troubleshooting

Common Topside Display Messages

Code	Meaning	Action
dr	Heater may be dry — will retest shortly	Check water level, filter condition, closed valves, pump prime, and flow restrictions
drY / dY	Verified dry heater — spa functions disabled	Resolve flow issue; press any button to reset after correction
CFE / CONFIG ERROR	DIP switch configuration error	Verify DIP switch settings match the spa equipment; contact technician
CrC / CHKSUM FAIL	Firmware checksum error at power-up	Cycle power off/on; if repeated, contact dealer
– – –	Water temperature unknown	Normal — wait 2 minutes with heater pump running
Sn / SN	Sensor fault (temperature or hi-limit sensor)	Check sensor wiring and connectors; swap Sensor A and B to isolate faulty sensor
No COM	Communication error between topside and control board	Check topside cable connection; inspect connector pins for corrosion
PRIMING / Pr	System in priming mode	Normal startup sequence — manually prime pumps using Jet buttons

Troubleshooting Quick Reference

Symptom	Likely Cause	First Step
Nothing operates	Breaker off / GFCI tripped	Check breaker and GFCI; restore power
No heat	Low water flow or incorrect setup	Check filter, water level, flow valves; verify circ pump setup
GFCI trips immediately	Wiring fault or improper GFCI installation	Contact licensed electrician
Pump 2 not responding	Expander board not connected or wrong setup selected	Verify J1 connection on expander; check setup number
Display shows “T” after temp	Test Mode active (DIP Switch 1 ON)	Move S1 Switch 1 to OFF to exit Test Mode

⚠️ These error codes apply to Balboa BP-series control systems. Always refer to the official Balboa BP7 Installation/Operation Manual for complete diagnostic procedures. Contact Parts4Tubs technical support for additional assistance.

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🎯 Ideal Applications

Application	Suitability	Notes
♨️ Replacing failed BP7 main circuit board	✅ Direct replacement	Must configure DIP switches and jumpers to match existing spa setup
♨️ Upgrading from Balboa BP501 system	✅ Compatible retrofit	Verify topside panel compatibility and setup configuration
♨️ Upgrading from Balboa BP2000 system	✅ Compatible retrofit	Review setup table; wiring changes may be required
♨️ Spa with TP500 or TP600 topside panel	✅ Supported	Direct connection to MAIN jack on board
♨️ Spa with spaTouch™ topside panel	✅ Supported	Confirm spaTouch version meets minimum software requirement
♨️ Spa with optional Wi-Fi / ControlMySpa	✅ Supported	Wi-Fi module connects to J34 or J35 MAIN connector
♨️ Spa with MicroSilk® air injection	✅ Supported	Setups 22–29 only; output on J14
♨️ Spa with Clim8zone™ heat pump	✅ Supported	Requires G1361-02 (current revision); G4361-02 / G5361-02 system

This board is designed for:

• Restoring full spa functionality after main PCB failure
• Replacing BP-series boards that are no longer responding or causing error codes
• Servicing spas with ControlMySpa, bba™, or CHROMAZON3™ features that need board-level support
• Upgrading older BP-series control systems to the current BP7 platform

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❓ Frequently Asked Questions

Q: How do I know this board fits my spa? A: Confirm that your spa currently runs a Balboa BP7, BP2000, or BP501 control system. Locate the part number on the existing board or system label. This board (G1361-02) is the main PCB for the BP7 system. Match part numbers including G1361, G1361-02, G4361, G5361, or BP7R3C. Contact Parts4Tubs with your system label if unsure.

Q: Is this an OEM or aftermarket board? A: This is a genuine OEM Balboa Water Group circuit board. The BP7 was specifically designed by Balboa as a universal aftermarket replacement platform, making it the correct factory replacement for many spa control systems.

Q: Do I need a licensed electrician to install this? A: Yes. NEC Article 680 and most local jurisdictions require a licensed electrician for all spa electrical work, including board replacement. A permit may also be required depending on your local code. Do not attempt installation without proper qualifications — incorrect wiring can cause fire, electrocution, or equipment damage.

Q: Will my existing topside panel work with this board? A: Compatible panels include TP200T/W, TP400T/W, TP500/TP500S, TP600, TP700/TP740, TP800, TP900, and all spaTouch™ series panels. Contact Parts4Tubs with your topside model number if uncertain.

Q: What voltage does this board require? A: 240VAC / 60Hz with a 48A service and 60A maximum breaker. This is a North American UL-listed board. Circ pump and ozone outputs can optionally be configured for 120VAC (both must be the same voltage). Always verify your service before connecting.

Q: What heater sizes does this board support? A: The BP7 system supports 4.0kW (Heater Kit G7412) and 5.5kW (Heater Kit G7512) Balboa 800 Incoloy heater assemblies at 240VAC. The jumper J24 must be correctly set for the heater voltage.

Q: What Setup should I select for my spa? A: The correct setup depends on your spa’s pump and equipment configuration. Refer to the Setup Reference Table in the Balboa BP7 tech sheet or installation manual. The board ships in Setup #21 by default. Setup changes are made via the topside panel with DIP Switch 1 in Test Mode.

Q: What is the difference between this PCB and the complete control kit? A: This item (G1361-02) is the main logic board only. Complete control kits (G4361-02 / G5361-02) include the board, enclosure, heater assembly, and associated hardware. If only the circuit board has failed and all other system components are intact, this replacement PCB is the correct part.

Q: What warranty is included? A: Balboa Water Group provides a 1-year warranty on this circuit board against defects in materials and workmanship from the date of purchase. Contact Parts4Tubs for warranty claim assistance.

Q: What if I get error codes after installation? A: The most common post-installation issues involve incorrect setup selection, jumper configuration, or sensor connections. Verify Setup number, J24 jumper position, DIP switch settings, and sensor plug connections. Contact our technical support team for guided troubleshooting.

📥 Downloads & Resources

📄 Balboa BP7 Tech Sheet — G4361-02 / G5361-02 (Manufacturer PDF) — Full DIP switch settings, setup tables, wiring diagrams, and output specifications

📄 Balboa BP7 Installation & Operation Manual — Complete installation guide, wiring details, pump cord configuration, startup procedures, and troubleshooting

🏆 Why Choose the Balboa BP7 Main PCB (G1361-02)?

✅ Genuine OEM Part — Actual Balboa Water Group board, not a third-party imitation; ensures full software and hardware compatibility

✅ Broadest Setup Flexibility — 32 software configurations support virtually any pump, blower, and circ pump combination with no additional hardware

✅ Proven Compatibility — Replaces BP501, BP2000-X, and all BP7 variants; works with every current Balboa topside panel family

✅ Smart Technology Ready — Supports Wi-Fi (ControlMySpa), Bluetooth Audio (bba™2/bba™3), CHROMAZON3™ color control, and Clim8zone™ heat pump — future-proofs the spa’s control system

✅ UL Listed — North American safety certification through UL System Models BP20-BP7-AU and BP20-BP7-AS

✅ Built-In Safety — Class A GFCI trip detection, freeze protection at 44°F, hi-limit sensor monitoring, heater dry-detection, and dual sensor A/B inputs all built into board logic

✅ 1-Year Manufacturer Warranty — Covered by Balboa Water Group’s warranty against defects in materials and workmanship

🤝 Why Buy From Parts4Tubs?

✅ US-based company with expert local support

✅ Fast US shipping on in-stock parts

✅ Spa specialists available for technical advice and compatibility verification

✅ Competitive pricing on genuine Balboa OEM parts

✅ Full warranty support — we handle claims with the manufacturer on your behalf

✅ Easy returns within 30 days on eligible items

✅ Compatible accessories available: topside panels, expander boards, sensors, heater kits, Wi-Fi modules, and more

Not sure if this is the right board for your spa? Contact our team with your spa’s make, model, existing board part number, and the System Data Label information from inside your control box.

⚡ Summary

The Balboa BP7 Main Circuit Board (G1361-02) is the genuine OEM replacement PCB for the industry’s most versatile spa control platform. Supporting up to four pumps, a dedicated circulation pump, heater, ozone, lighting, and optional smart-home connectivity — all across 32 selectable software setups — it restores full functionality to spas running any Balboa BP7, BP2000, or BP501 control system. With UL listing, built-in safety features including GFCI trip detection and freeze protection, and compatibility with every current Balboa topside panel, this board is the definitive choice for spa technicians and owners seeking a reliable, long-lasting repair. Order today from Parts4Tubs and get your spa running again with confidence.

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.