⚡ Balboa BP2000G1 Spa Circuit Board — 59157-01 / G1321 (BP2000 Series, 3-Pump / Circ Pump, 5.5kW, 18 Setups) OEM-quality replacement board for the most versatile BP-series platform — up to three pumps, optional circ pump, 18 software-configurable setups. �� Product Overview The Balboa BP2000G1 circuit board (main PCBA 59157-01, catalog reference G1321) is the genuine OEM main PCB for the Balboa BP2000G1 control system — the most feature-rich and configurable board in the BP-series lineup. Running on the same BP platform as the BP501 family but with significantly expanded output capacity, the BP2000G1 supports up to three independent pump circuits (two 2-speed pumps plus a 2-speed third pump via the X-P332 expander), an optional 120V circulation pump, a blower, a 5.5kW heater, ozone, 10V spa lighting, and audio — across 18 field-selectable software setups. The BP2000G1 is the control platform of choice for larger, more complex spas: three-pump configurations, combined circ-pump and multi-pump systems, systems with Clim8zone™ heat pump integration, and the full spaTouch/TP900/TP800/TP600 topside ecosystem. It connects via a 4-pin Molex connector to all TP-series and spaTouch panels, and supports two independent auxiliary panel banks (J5 and J8) for expanded zone control. This board is the current-generation replacement for all earlier BP2000-G1 variants, including the legacy 56380 series. Used across a wide range of OEM spa brands. Ships factory-new and covered under the Balboa Water Group manufacturer’s warranty. �� Key Features ✅ 18 Software-Selectable Setups — The most flexible BP-series board available; covers every spa plumbing combination from a single-pump spa (Setup 4) through a full three-pump blower circ-pump configuration (Setups 11, 12, 16). ✅ Three Pump Zones — Pump 1 (2-speed, 12A, native) and Pump 2 (2-speed, 12A, native at J14); Pump 3 (2-speed or 1-speed depending on setup, via X-P332 expander board at J107) — three independent jet zones in a single control system. ✅ Optional Circulation Pump — 120V circ pump output (2A max) at J21; Setups 7–14, 16, 17 activate the circ pump as the heater pump. Circ pump and ozone can be field-converted to 240V together (both must remain the same voltage). ✅ 5.5kW Heater (4.0kW also available) — Full-power heating via Plug & Click heater connection; system packs available in 800 Incoloy (5.5kW and 4.0kW), 825 Incoloy (5.5kW), and Titanium (5.5kW and 4.0kW). ✅ Blower Output — 1-Speed, 4A max; used in Setups 3, 5, 9, 11, 12, 17, 18 via J14 with J43-to-J13 wire connection. ✅ 120V Ozone Output (Convertible to 240V) — Slaved to circ pump in circ-pump setups; independent in non-circ setups. Both circ pump and ozone must be the same voltage. ✅ Dual Auxiliary Panel Banks — J5 (Bank 1, buttons A1–A4) and J8 (Bank 2, buttons A5–A8) for expanded topside control in large spa installations. ✅ Full spaTouch and TP Series Compatibility — Works with spaTouch 1/2/3, Icon spaTouch, Menued spaTouch, TP900, TP800, and TP600 (all at version 2.7 ). IR Receiver module supported at J40. ✅ Clim8zone™ Heat Pump Support — Compatible with Balboa Clim8zone™ heat pump integration (requires AV rewired to 240V at J38). ✅ CHROMAZON3™ LED Lighting Support — Compatible with CHROMAZON E™ and CHROMAZON3™ LED systems via topside panel connection; shares the 2A spa light output. ✅ bba™2 / bba™3 Bluetooth Audio — Integrated with TP800, TP900, and spaTouch panels for wireless audio connectivity. ✅ Current-Generation Replacement — Replaces all earlier BP2000-G1 boards including the legacy 56380 series; genuine Balboa Water Group OEM, factory-new and non-returnable. �� Technical Specifications Specification Value Main PCBA Part Number 59157-01 Catalog Reference G1321 Chip Number BP2000G1 UL System Model BP20-BP2000G1-AU Software Version 65.0 Board Type Main PCB — complete replacement control board Series BP2000 Generation 1 (G1) Input Voltage 240V AC / 60Hz Service Type 4-wire (Hot-Black, Hot-Red, Neutral-White, Ground) Max Input Current 48A Circuit Breaker 60A maximum GFCI Requirement AC Class A GFCI protected circuit required Heater Output 5.5kW @ 240V (4.0kW variants also available) Heater Connection Plug & Click Pump 1 2-Speed — 12A max — heater pump in Setups 1–6, 15, 18 (must deliver 20 GPM through heater) Pump 2 2-Speed — 12A max (J14) / 1-Speed in Setups 5, 6, 11–14, 17, 18 Pump 3 2-Speed (Setups 1, 7) / 1-Speed (other setups) — via X-P332 expander at J107; 12A max† Blower 1-Speed — 4A max — via J14 with J43-to-J13 wire connection Circ Pump 120V / 2A max (J21) — heater pump in Setups 7–14, 16, 17 — convertible to 240V Ozone 120V / 0.5A max (J32) — slaved to circ pump in circ setups — convertible to 240V with circ pump Spa Light 10V AC / 2A max — shared with CHROMAZON3™ output — 240-minute timer AV / Audio 120V / 4A max (default); convertible to 240V for Clim8zone™ use Software Setups 18 configurable setups Topside Connection 4-pin Molex connector — all TP and spaTouch panels Auxiliary Banks J5 (Bank 1: A1–A4) and J8 (Bank 2: A5–A8) Expander Board X-P332 / PN 59097 (replacement PCBA for Pump 3) Wire Gauge #6 AWG minimum, 90°C rated, copper conductors only TB1 Torque 27–30 in. lbs. Temperature Range (Hi) 80°F – 104°F; default 100°F Temperature Range (Lo) 50°F – 99°F; default 70°F Freeze Threshold 44°F (adjustable 39–54°F) — rotating pump activation Ships In Setup Setup 1 Warranty Balboa Water Group manufacturer’s warranty — contact Parts4Tubs for details Return Policy Non-returnable — verify compatibility before ordering † In Setups 5, 11, and 12 where Pump 2 and Pump 3 are both on the expander, the combined total of both outputs must not exceed 20A. ℹ️ US VOLTAGE NOTE: The BP2000G1 operates on 240V AC / 60Hz on a 4-wire service with a 60A maximum breaker. The circ pump and ozone output at 120V by default; both can be field-converted to 240V together. �� Compatibility Guide System Pack Part Numbers: System Pack Heater Type Heater Power 56377-05 800 Incoloy 5.5kW 56378-05 825 Incoloy 5.5kW 56379-05 Titanium 5.5kW 56589-03 Titanium 4.0kW 59415-01 800 Incoloy 4.0kW Compatible Topside Panels: Panel Version Requirement spaTouch™3 Any version (v3.2 for Clim8zone™ heat pump) 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 (v3.13 for bba™) TP800 Version 3.1 and later (v3.13 for bba™; v4.11 for bba™2) TP600 Version 2.7 and later (v2.12 for bba™/bba™2 On/Off via menu) Auxiliary Panels (J5 Bank 1 / J8 Bank 2): Panel Part Number AX10A1 52803 AX10A2 52804 AX10A3 52805 AX10A4 52806 AX20 (A1 A2) 52800 AX20 (A1 A3) 52801 AX20 (A1 A4) 52802 AX40 52799 Expander Board for Pump 3: Part Number Description 59097 Current expander PCBA for Pump 3 (replaces earlier expander boards) X-P332 (55137) X-P332 expander board — also used in VS520 and BP501 systems Replaces / Cross-Reference Part Numbers: Part Number Description 59157-01 Main PCBA — current revision designation 59157 Earlier version G1321 Balboa catalog reference BP2000G1 Chip number 56380-03 / 56380 / 56380-02 Legacy board numbers — all replaced by 59157-01 56379 / 56379-01 Legacy board numbers — replaced by 59157-01 56380r1a / BP2000G1R1D Earlier chip/board designations 56380B Earlier BP2000G1 variant 9297-010 Alternate earlier reference 33-56380-K HydroQuip cross-reference ⚠️ Always identify your board by the chip number (BP2000G1) on the white label near the center of the PCB. Many BP-series boards look similar — never order by appearance alone. ��️ Board Functions & Controls Pump Outputs: Output Function Rating Notes Pump 1 (J9) Primary jet pump — 2-Speed 12A max Heater pump in Setups 1–6, 15, 18 Pump 2 (J14) Secondary jet pump — 2/1-Speed 12A max Also carries blower in some setups via wire change Pump 3 (J107 expander) Third jet zone — 2/1-Speed 12A max† Requires expander board (PN 59097) Blower (J14) Air blower — 1-Speed 4A max J43 wire connected to J13; Setups 3, 5, 9, 11, 12, 17, 18 Circ Pump (J21) Continuous circulation — 1-Speed 2A max Heater pump in Setups 7–14, 16, 17 18-Setup Reference Table: Setup Circ Pump Pump 1 Pump 2 Pump 3 Blower 1 (default) None 2-Speed 2-Speed 2-Speed None 2 None 2-Speed 2-Speed 1-Speed None 3 None 2-Speed 2-Speed None 1-Speed 4 None 2-Speed 2-Speed None None 5† None 2-Speed 1-Speed 1-Speed 1-Speed 6 None 2-Speed 1-Speed 1-Speed None 7 Prog. Filtration Polling 2-Speed 2-Speed 2-Speed None 8 Prog. Filtration Polling 2-Speed 2-Speed 1-Speed None 9 Prog. Filtration Polling 2-Speed 2-Speed None 1-Speed 10 Prog. Filtration Polling 2-Speed 2-Speed None None 11† Prog. Filtration Polling 2-Speed 1-Speed 1-Speed 1-Speed 12† Prog. Filtration Polling 1-Speed 1-Speed 1-Speed 1-Speed 13 Prog. Filtration Polling 2-Speed 1-Speed 1-Speed None 14 Prog. Filtration Polling 1-Speed 1-Speed 1-Speed None 15† None 2-Speed 2-Speed 1-Speed 1-Speed 16† Prog. Filtration Polling 2-Speed 2-Speed 1-Speed 1-Speed 17 Prog. Filtration Polling 1-Speed 1-Speed None 1-Speed 18 None 2-Speed 1-Speed None 1-Speed † Setups 5, 11, 12, 15, and 16 require the BP2X-Wire Kit (PN 30893). Heater Control: Feature Specification Heater Output 5.5kW @ 240V (4.0kW variants available) Heater Pump Pump 1 low (Setups 1–6, 15, 18) OR circ pump (Setups 7–14, 16, 17) Temperature Range (Hi) 80°F – 104°F; default 100°F Temperature Range (Lo) 50°F – 99°F; default 70°F Freeze Threshold 44°F (adjustable 39°F – 54°F) DIP Switch Summary (S1): Switch Function A1 Test Mode — normally OFF A2 ON = add 1 high-speed pump/blower with heater A3 ON = add 2 high-speed pumps/blower with heater A4 ON = add 4 high-speed pumps with heater A5 ON = Special Amperage Rule B; OFF = Rule A A6 Persistent memory reset (set OFF after final installation) A7 ON = 5-minute cooldown (gas heater); OFF = 1-minute (electric) A8–A10 Not assigned ⚙️ Installation Requirements ⚠️ IMPORTANT: Installation must be carried out by a licensed electrician in compliance with NEC (National Electrical Code) and local codes. Pre-Installation Checklist: [ ] Confirm chip number BP2000G1 on the white label of your existing board [ ] Determine which of the 18 setups matches your spa’s plumbing — check the label inside the system lid [ ] Disconnect all power at the breaker and disconnect box before beginning [ ] Photograph all existing wiring connections and note all DIP switch positions [ ] Allow capacitors to discharge — wait at least 5 minutes after power-off [ ] Confirm whether your Pump 3 is installed (expander board PN 59097 needed) [ ] Determine if your setup requires the BP2X-Wire Kit (PN 30893) — required for Setups 5, 11, 12, 15, and 16 [ ] Write Setup number on the label inside the lid for future reference Electrical Requirements: Requirement Specification Supply Voltage 240V AC / 60Hz Service Type 4-wire (hot, hot, neutral, ground) Max Input Current 48A Circuit Breaker 60A maximum GFCI Protection AC Class A GFCI required (per NEC Article 680) Ground Connection Mandatory — equipment grounding bonding per NEC Article 680 Dedicated Circuit Required Disconnect Box Required within line of sight of spa (per NEC) Wire Gauge #6 AWG minimum, 90°C rated, copper conductors only Critical Wiring Notes: Note Detail Circ pump and ozone voltage Both must be the same voltage — either both 120V (default) or both 240V (convert by moving J20 to Group 2) AV output for Clim8zone™ Must be rewired from 120V to 240V by moving J38 from Group 4 to Group 2 Blower activation Move J43 to J13 connector in Setups 3, 5, 9, 11, 12, 17, 18 Pump 3 (expander) splitter Setups 5, 11, 12 require the optional splitter PN 22934 on J107 BP2X-Wire Kit requirement Setups 5, 11, 12, 15, 16 require PN 30893 TB1 Torque 27–30 in. lbs. Heater connection torque 30–35 in. lbs. J24 jumper Center 2 pins (230V) for 240V heater; outer 2-pin pairs for 120V heater �� Tip: Write the active Setup number on the label inside the system lid immediately after configuration — this is essential for any future technician replacing the board. ⚠️ Safety Warnings Electrical Safety: ⚠️ ALWAYS disconnect power at the breaker and disconnect box before any work on the spa pack ⚠️ Installation by a licensed electrician only ⚠️ This board requires 240V AC / 60Hz on a 4-wire service — verify before connecting ⚠️ AC Class A GFCI protection is required by NEC Article 680 for all spa installations ⚠️ Total output amp draw must not exceed the maximum input rating of the spa system ⚠️ Never operate the spa with covers removed from electrical components ⚠️ All wiring must comply with NEC and applicable local electrical codes ⚠️ Use copper conductors only — #6 AWG minimum, 90°C rated Circ Pump & Ozone Voltage Warning: ⚠️ The circ pump and ozone generator must be wired to the same voltage — both 120V or both 240V. Converting one without converting the other will damage components. Expander Setup Warning: ⚠️ In Setups 5, 11, and 12 where Pump 2 and Pump 3 are both on the expander board, their combined output must not exceed 20A total. ⚠️ Setups 5, 11, 12, 15, and 16 require the BP2X-Wire Kit (PN 30893) — do not configure these setups without it. DIP Switch Warning: ⚠️ Setting DIP switches or jumpers incorrectly may cause abnormal system behavior and component damage ⚠️ Turn main power OFF before adjusting any DIP switch ⚠️ A6 is the persistent memory reset — leave in OFF position after final installation Post-Installation: ⚠️ Verify the heater pump (Pump 1 low or circ pump, depending on setup) achieves at least 20 GPM through the heater ⚠️ Test all safety features — GFCI, hi-limit sensor — before returning the spa to service ⚠️ Check for error codes on initial startup and resolve before use �� Troubleshooting Common Issues After Board Replacement: Symptom Likely Cause Action “FLO” or flow fault Heater pump not achieving 20 GPM Verify correct pump is active as heater pump for your setup; check plumbing and pump operation Breaker trips Voltage mismatch, wiring error, or pump count vs DIP switch settings Check 4-wire 240V supply; verify DIP switches A2/A3/A4 match your pump configuration Pump 3 not operating Expander board not installed or not configured for active setup Confirm expander (PN 59097) is installed at J107 and setup requires Pump 3 New settings ignored after swap Persistent memory not reset Set DIP A6 ON during power-up, then set back to OFF after reset Wrong pumps responding Incorrect Setup active Enter test mode (A1 ON) and select correct Setup via topside Ozone or circ pump fails after voltage conversion Mixed voltages — one converted, other not Verify both circ pump and ozone are wired to the same voltage group Blower unresponsive J43-to-J13 wire connection missing Connect J43 to J13 for blower operation in applicable setups AV / Clim8zone™ not working AV wired to 120V but 240V required Move J38 from Group 4 to Group 2 for Clim8zone™ support �� Ideal Applications Application Suitability Notes ♨️ Balboa BP2000G1 systems ✅ Direct OEM replacement Match chip number BP2000G1; replaces all 56380-series legacy boards ♨️ 3-pump hot tubs ✅ Full native support Up to 3 independent pump zones across 18 setups ♨️ Spas with circ pump multi-pump ✅ Fully configurable Setups 7–14, 16, 17 support circ pump as heater pump alongside jet pumps ♨️ High-end spa installations with spaTouch/TP900 ✅ Full compatibility All spaTouch generations and TP900/800/600 supported ♨️ Spas with Clim8zone™ heat pump ✅ Compatible Requires AV rewired to 240V and spaTouch v3.2 ♨️ Coast Spas, and other BP2000 OEM brands ✅ OEM equivalent Used as original equipment across many OEM spa brands ❓ Frequently Asked Questions Q: How do I confirm this is the right board for my spa? A: Find the chip number on the white label near the center of your existing board. It must read BP2000G1. Also check the system pack exterior label — system pack numbers 56377-xx, 56378-xx, 56379-xx, 56589-xx, or 59415-xx all use this board. Never order by appearance alone. Q: What’s the difference between the BP2000G1 and the BP501G3? A: The BP2000G1 is a higher-capacity system with up to three pump circuits, a dedicated circ pump output, 18 software setups, and two auxiliary panel banks. The BP501 series is a simpler platform with fewer pump options and 8–10 setups. If your spa has three pump zones or a complex plumbing configuration, it uses the BP2000G1. Q: My spa has a Pump 3 — do I need anything else? A: Yes. Pump 3 requires the expander board (PN 59097) connected at J107. Additionally, some Pump 3 setups also require the BP2X-Wire Kit (PN 30893) and an optional splitter (PN 22934). Contact Parts4Tubs to confirm what’s needed for your specific setup. Q: The board ships in Setup 1 — will that match my spa? A: Probably not. Setup 1 configures 2-speed Pump 1, 2-speed Pump 2, 2-speed Pump 3, and no blower. You’ll need to switch to the Setup that matches your actual plumbing. Check the label inside your spa pack lid — the Setup number should be written there. Use Test Mode (DIP A1 ON) and the topside menu to change the Setup. Q: What setups require the BP2X-Wire Kit? A: Setups 5, 11, 12, 15, and 16 require the BP2X-Wire Kit (PN 30893). These are the configurations that combine blower operation with Pump 2 and/or Pump 3 simultaneously. Do not attempt these setups without the kit. Q: Can I use a TP400 topside with this board? A: The current-generation 59157-01 is designed for spaTouch and TP600/800/900 panels only. If you have a TP400, contact Parts4Tubs — an earlier board revision or a different solution may be needed. Q: What topside panels are compatible? A: All spaTouch generations (1/2/3, Icon, Menued), TP900, TP800 (v3.1 ), and TP600 (v2.7 ). For bba™ Bluetooth audio, specific minimum versions apply. Contact Parts4Tubs if you are unsure about your panel version. Q: Can I return this board if it doesn’t fit? A: Circuit boards are non-returnable. Please verify your chip number (BP2000G1) before ordering. Our team is happy to help confirm compatibility. Q: What warranty does this board carry? A: Covered under the Balboa Water Group manufacturer’s warranty. Contact Parts4Tubs for full warranty terms. �� Downloads & Resources �� Balboa BP2000G1 Tech Sheet — 56377-02 — Earlier revision tech sheet for legacy 56377-02 system packs ✅ Why Choose the Balboa BP2000G1 Board (59157-01 / G1321) ✅ Most Versatile BP-Series Board — 18 software setups cover every spa configuration from a simple 1-pump layout through a full 3-pump blower circ-pump system ✅ Genuine Balboa Water Group OEM — Current-generation main PCBA directly from Balboa; replaces all earlier 56380-series legacy boards ✅ 5.5kW Heater Support — Full heating power at 240V (4.0kW variants also available) ✅ Three Pump Zones — Native Pump 1 and Pump 2; Pump 3 via expander; handles the most complex jet plumbing configurations ✅ Full spaTouch and TP Ecosystem — Works with every current Balboa topside from the TP600 through spaTouch 3 ✅ Clim8zone™ and CHROMAZON3™ Ready — Future-compatible with heat pump integration and advanced LED lighting systems ✅ Dual Auxiliary Panel Banks — Expanded remote control capability via J5 and J8 ✅ Factory-New, Never Installed — Non-returnable policy ensures every board shipped is pristine �� Why Buy From Parts4Tubs ✅ Fast US shipping on in-stock parts ✅ Expert technical advice from spa specialists who know BP2000 systems ✅ Competitive pricing on genuine OEM boards ✅ Full warranty support — we help you navigate manufacturer claims ✅ Easy returns within 30 days on eligible items (circuit boards are non-returnable per manufacturer policy) ✅ Expander boards, BP2X-Wire Kits, TP topsides, spaTouch panels, and accessories available ✅ Help identifying the correct Setup and accessories for your specific spa configuration �� Summary The Balboa BP2000G1 circuit board (59157-01 / G1321, chip BP2000G1) is the genuine OEM main PCB for the BP2000G1 control platform — Balboa’s most powerful BP-series board. Running on 240V / 60Hz with a 60A circuit, it drives up to three pumps (Pump 1 and 2 natively; Pump 3 via expander at J107), an optional 120V circ pump, a blower, a 5.5kW heater, ozone, 10V lighting, and audio — across 18 field-selectable software setups. Compatible with all spaTouch generations, TP900, TP800, and TP600 topsides, and Clim8zone™ heat pumps. Ships in Setup 1; requires field configuration. Current replacement for all 56380-series legacy boards. Verify chip number BP2000G1 before ordering — circuit boards are non-returnable. Order from Parts4Tubs for fast US shipping and expert support. Can replace MXBP20, 56937-11, MS90U, BP20-MS90U, 59470, MS90UR3A, PBP20X, MS40U Parts4Tubs is proud to be a Balboa Authorized Online Seller - make sure you only buy genuine Balboa parts from trusted sources. 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.