💡 Balboa BP100UX Spa Circuit Board — G1310

Restore your hot tub with this versatile genuine replacement board for BP100-series spa control systems

⚡ Product Overview

The Balboa BP100UX Circuit Board (G1310) is a genuine Balboa Water Group main PCB designed as the universal replacement for the entire BP100 control board family. A single G1310 board consolidates three previously separate systems — the BP100G1, BP100G2, and BP100G3 — into one configurable platform with an optional user-installed expander board. The expander board mounting hardware is pre-installed on the board from the factory, giving technicians everything they need to add a pump or blower output without modifying the enclosure.

The BP100UX governs all core hot tub functions including single and two-speed pump operation, dedicated circulation pump filtration and polling, blower control, ozone, spa light, audio/visual output, and precise temperature management across dual Hi/Lo ranges. It supports both 240VAC and, uniquely among compact Balboa boards, 120VAC power input for Setups 5 through 7 — making it one of the most versatile replacement boards in the BP-series lineup.

Compatible with the full range of Balboa topside control panels from the simple TP200 series through the TP900 and all spaTouch® graphic display families, this board also supports Balboa Bluetooth Audio (bba™ and bba™2) and optional ControlMySpa Wi-Fi connectivity. Whether you are replacing a failed BP100G1, BP100G2, or BP100G3 board, the G1310 is the current genuine OEM replacement that covers all three.

🌟 Key Features

✅ Single Board Replaces Three Systems — The BP100UX (G1310) is the unified replacement for BP100G1, BP100G2, and BP100G3 spa control boards; one correct part number covers the entire BP100 family

✅ Dual Voltage Capability — Operates on 240VAC (Setups 1–6) or 120VAC (Setups 5–7 only), with built-in jumpers for heater voltage selection — highly versatile for both standard and plug-in spa configurations

✅ Expander Board Hardware Pre-Installed — Mounting hardware for the optional X-P (Pump 2) or X-B (Blower) expander board is factory-fitted to the board; no enclosure modifications required to add a pump or blower output

✅ Pump & Blower Expansion Ready — Supports optional X-P expander (PN 59232) for a 1-speed Pump 2 in Setups 1 & 2, and X-B expander (PN 59231) for a 1-speed Blower in Setups 3 & 4

✅ Dedicated Circulation Pump Output — 240VAC (or 120V), 2A max; programmable filtration cycles plus polling keep water clean and temperature accurate between user sessions

✅ 7 Software Setup Configurations — Covers circ/non-circ, 1-speed/2-speed Pump 1, Pump 2, and Blower combinations; shipped in Setup 6 by default and field-configurable via DIP switch and topside panel

✅ Wide Topside Panel Compatibility — Works with TP200T/W, TP400T/W, TP500, TP600, TP800, TP900, and all spaTouch™ graphic display families; supports Simplified Menu mode for TP400/500/600 panels

✅ Bluetooth Audio Ready — Supports bba™ (TP800/TP900/spaTouch) and bba™2 (TP800 v4.11+/spaTouch v2.0+) Balboa Bluetooth Amp integration

✅ Wi-Fi Connectivity Support — Optional ControlMySpa Wi-Fi module connects via J34 or J35; requires DIP switch A7 in OFF position (Standard Menus)

✅ UL Listed — UL System Models BP1-BP100UX-BU (5.5kW), BP1-BP100UX-BS (4.0kW), and BP1-BP100UX-B (remote heater)

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

📊 Technical Specifications

Specification	Value
Manufacturer Part Number	G1310
System Part Numbers	59293-01 (5.5kW integral), 59294-01 (4.0kW integral), 59295-01 (Remote Heater)
Replacement PCBA	59499
Board Platform	BP100UX (replaces BP100G1, BP100G2, BP100G3)
Board Type	Main PCB / Control Board
Chip Number	BP100UXR3A
Software Version	M100_230 V52.0
Primary Input Voltage	240VAC, 50/60Hz (Setups 1–6)
Alternative Input Voltage	120VAC, 50/60Hz — Setups 5–7 ONLY
Maximum Service Amperage (240V)	48A
Circuit Breaker (240V)	60A maximum
Service Amperage (120V, wall-mount GFCI)	16A (20A breaker max)
Service Amperage (120V, GFCI cord)	12A maximum
Wiring Configuration (240V)	4-wire: Hot, Hot, Neutral, Ground
Minimum Wire Gauge	#6 AWG copper, 90°C rated
Terminal Block Torque (TB1)	27–30 in. lbs.
Heater Connection Torque	30–35 in. lbs.
Pump 1 Output	240VAC, 2-Speed (1-Speed in Setups 1, 3, 5), 12A max
Pump 2 Output	240VAC, 1-Speed, 12A max — Setups 1 & 2 via X-P expander (PN 59232)
Blower Output	240VAC, 1-Speed, 4A max — Setups 3 & 4 via X-B expander (PN 59231)
Circulation Pump Output	240VAC (or 120V), 1-Speed, 2A max
Ozone Output	240VAC (or 120V), 0.5A max
Spa Light Output	10VAC, On/Off, 1A max
A/V (Stereo) Output	120VAC, 3A max (always on)
Heater — 5.5kW Version	5.5kW @ 240VAC (approx. 1.4kW @ 120VAC)
Heater — 4.0kW Version	4.0kW @ 240VAC (1.0kW @ 120VAC)
Heater Flow Requirement	Minimum 20 GPM through heater
Software Setups	7 (Ships in Setup 6)
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)
GFCI	Class A GFCI required; internal GFCI trip detection supported
Certifications	UL (System Models BP1-BP100UX-BU, BP1-BP100UX-BS, BP1-BP100UX-B)
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

⚠️ US Voltage Note: This is a North American UL-listed board. The 240VAC input is standard for Setups 1–6. The 120VAC option applies to Setups 5–7 only and requires specific wiring changes and jumper adjustments. Always verify your spa’s electrical configuration before ordering.

⚠️ Voltage Rule: Pump 1, Circ Pump, and Ozone MUST all be the same voltage — all 240VAC or all 120VAC.

🔗 Compatibility Guide

Systems This Board Replaces

System	Description
BP100G1	Earlier BP100 single-board configuration
BP100G2	BP100 system with pump expander support
BP100G3	BP100 system variant
BP100UX	Current unified platform (direct match)

Cross-Reference Part Numbers

Part Number	Description
G1310	Balboa Water Group — current main PCB part number
G4311	System kit variant
59499	Main PCBA replacement number
59293 / 59293-01	Complete system — 5.5kW 800 Incoloy integral heater
59294 / 59294-01	Complete system — 4.0kW 800 Incoloy integral heater
59295 / 59295-01	Complete system — Remote heater (heater sold separately)
59494	System variant reference
33-59494-K	Kit variation

Compatible Topside Control Panels

Panel	Minimum Version
spaTouch™2	Any version (v2.0+ for bba™2)
Icon spaTouch™	Any version (v3.36+ for bba™2)
Menued spaTouch™	Any version (v2.8+ for bba™2)
TP900	Version 3.1+ (v3.13+ for bba™)
TP800	Version 3.1+ (v3.13+ for bba™; v4.11+ for bba™2)
TP600	Version 2.7+ (v2.12+ for bba™/bba™2 menu control)
TP500	Any version
TP400T (US)	Version 2.7+ (v2.12+ for bba™/bba™2 menu control)
TP400W (US)	Version 2.7+ (v2.12+ for bba™/bba™2 menu control)
TP200T	Any version
TP200W	Any version

⚠️ Panel note: TP800 is not supported in Setup 7. TP600 is not supported in Setup 7. Do not use graphic panels (TP800, TP900, spaTouch™) with Simplified Menus (DIP Switch A7 ON).

⚠️ Always verify your existing board’s part number before ordering. Do not select a replacement board based on appearance — many Balboa boards look similar but contain different software.

🎛️ Board Functions & Controls

Pump Control

Output	Connector	Setup Availability	Voltage	Rating
Pump 1 (2-Speed)	J9	Setups 2, 4, 6	240VAC	12A max
Pump 1 (1-Speed)	J9	Setups 1, 3, 5	240VAC	12A max
Pump 1 (unused)	—	Setup 7 only	—	—
Pump 2 (1-Speed)	J4 via X-P expander	Setups 1 & 2 only	240VAC	12A max
Blower (1-Speed)	J3 via X-B expander	Setups 3 & 4 only	240VAC	4A max
Circ Pump	J19	Setups 1, 3, 5, 7	240VAC (or 120V)	2A max

Heater Control

Feature	Specification
Heater Type	Balboa Incoloy electric element (800 Incoloy)
5.5kW Version	5.5kW @ 240VAC; Heater PN 58421 (integral)
4.0kW Version	4.0kW @ 240VAC; Heater PN 58426 (integral)
Remote Heater	Sold separately; see system PN 59295-01
Hi-Range Set Temp	80°F–104°F (26.7°C–40°C); default 100°F
Lo-Range Set Temp	50°F–99°F (10°C–37.2°C); default 70°F
Hi-Limit Protection	Built-in via Sensor A and Sensor B
Dry Heater Protection	Built-in detection circuit
Minimum Flow	20 GPM through heater
Heater Torque	30–35 in. lbs. at heater connections

Additional Outputs

Function	Connector	Specification
Spa Light	J15	10VAC, 1A max, 240-minute auto-timer
Ozone	J21	0.5A max; slaved to circ pump (circ setups) or P1 Low (non-circ)
A/V (Stereo)	J33	120VAC, 3A max, always on
Wi-Fi Module	J34 or J35	Optional ControlMySpa module
Freeze Protection	Automatic	44°F threshold; pumps rotate at lowest speed

Setup Reference Table

Setup #	Circ Pump	Pump 1	Pump 2	Blower	Expander Needed	Notes
1	Filtration + Polling	1-Speed	1-Speed	—	X-P (PN 59232)	Circ is heater pump
2	—	2-Speed	1-Speed	—	X-P (PN 59232)	P1 is heater pump
3	Filtration + Polling	1-Speed	—	1-Speed	X-B (PN 59231)	Circ is heater pump
4	—	2-Speed	—	1-Speed	X-B (PN 59231)	P1 is heater pump
5	Filtration + Polling	1-Speed	—	—	None	120V capable
6	—	2-Speed	—	—	None	Default shipped setup; 120V capable
7	Filtration + Polling	—	—	—	None	Circ pump only; 120V capable

DIP Switch Functions

Switch	OFF Position	ON Position
A1	Test Mode OFF	Test Mode ON
A2	No 1 HS pump with heater	Add 1 high-speed pump with heater
A3	No 2 HS pumps with heater	Add 2 high-speed pumps with heater
A4	1-min heater cooldown (electric)	5-min heater cooldown (gas)
A5	Special Amperage Rule A	Special Amperage Rule B
A6	Persistent memory retained	Persistent memory reset on power-up
A7	Standard Menus (compatible with all panels)	Simplified Menus (TP400/500/600 only — NOT with graphic panels)

🔧 Installation Requirements

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

Pre-Installation Checklist

• [ ] Confirm the existing board is a BP100G1, BP100G2, BP100G3, or BP100UX system
• [ ] Note the current Setup number from the label inside the system lid
• [ ] Confirm heater size (4.0kW or 5.5kW) and whether it is an integral or remote heater
• [ ] Confirm supply voltage (120V or 240V) — especially for Setups 5–7
• [ ] Disconnect ALL power at the circuit breaker and GFCI before beginning
• [ ] Photograph all wiring and connector positions before removing the old board
• [ ] Allow capacitors to discharge — wait at least 5 minutes after power-off

Electrical Requirements

Requirement	Specification
Supply Voltage (standard)	240VAC / 60Hz
Supply Voltage (120V option)	120VAC — Setups 5–7 ONLY
Circuit Breaker (240V)	60A maximum
Circuit Breaker (120V, wall-mount GFCI)	20A maximum
Circuit Breaker (120V, GFCI cord)	15A (service limited to 12A)
GFCI Protection	Class A GFCI required — NEC Article 680-42
Ground Connection	Equipment grounding and bonding required — NEC Article 680
Bonding Conductor	Solid copper to all metal within 5 ft of spa
Minimum Wire Gauge	#6 AWG copper, 90°C rated
Dedicated Circuit	Required
Disconnect	Within line of sight of spa, at least 5 ft from water (NEC)
Terminal Torque	TB1: 27–30 in. lbs.; Heater connections: 30–35 in. lbs.

Key Jumpers

Jumper	Function
J24	Center pins = 240V heater; outer pins = 120V heater
J31	1 pin = 120V heater; 2 pins = 240V heater
J109	GFCI Test/Trip Enable/Disable

⚠️ Critical: J24 and J31 must both be set correctly for the heater voltage. F3 fuse must also be changed: 0.1A for 240V heater, 0.16A for 120V heater. Always set DIP Switches A2 and A3 to OFF when using 120VAC configuration.

💡 Tip: Write the Setup number on the label inside the system lid using a permanent marker — essential for any future service.

⚠️ 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
• ⚠️ Verify supply voltage (120V or 240V) matches the selected setup before connecting
• ⚠️ Class A GFCI protection is mandatory per NEC Article 680-42
• ⚠️ Use copper conductors ONLY — no aluminum wiring
• ⚠️ 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

Board-Specific Warnings:

• ⚠️ Pump 1, Circ Pump, and Ozone MUST all be the same voltage — mixing voltages will cause damage
• ⚠️ Do NOT use graphic panels (TP800, TP900, spaTouch™) with Simplified Menus (DIP A7 ON)
• ⚠️ Setups 1–4 require an expander board (X-P or X-B); do NOT run these setups without the appropriate expander installed
• ⚠️ Jumpers J24 and J31 AND fuse F3 must all be set correctly for the heater voltage
• ⚠️ Setting DIP switches incorrectly may cause abnormal system behavior or component damage

Post-Installation:

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

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🔍 Error Codes & Troubleshooting

Common Topside Messages

Code	Meaning	First Action
dr	Heater may be dry — will retest	Check water level, filter, valves, pump prime, flow rate
drY / dY	Verified dry heater — spa disabled	Resolve flow issue; press any button to reset
CFE / CONFIG ERROR	DIP switch configuration conflict	Check DIP switch settings match equipment; A7 must be OFF with graphic panels
CrC / CHKSUM FAIL	Firmware checksum error at power-up	Power off/on; if repeated, contact dealer
– – –	Water temperature unknown	Normal — wait 2 minutes with heater pump running
Sn / SN	Sensor fault	Check sensor connections; swap Sensor A and B to isolate fault

Troubleshooting Quick Reference

Symptom	Likely Cause	First Step
Nothing operates	Breaker off / GFCI tripped	Reset breaker and GFCI
No heat	Low flow, wrong setup, or wrong voltage	Check filter, water level, heater voltage jumpers, Setup selection
GFCI trips immediately	Wiring fault or improper GFCI install	Contact licensed electrician
Pump 2 not responding	X-P expander not installed or wrong setup	Verify Setup 1 or 2 is selected; confirm X-P expander (59232) is installed
Blower not responding	X-B expander not installed or wrong setup	Verify Setup 3 or 4 is selected; confirm X-B expander (59231) is installed
Display shows “T” after temp reading	Test Mode active (DIP Switch A1 ON)	Move A1 to OFF to exit Test Mode
Panel menus not working as expected	A7 Simplified Menus set on graphic panel	Turn A7 to OFF for use with TP800/TP900/spaTouch™

⚠️ Always refer to the official Balboa BP100UX Tech Sheet for complete diagnostic procedures. Contact Parts4Tubs technical support for additional assistance.

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🎯 Ideal Applications

Application	Suitability	Notes
♨️ Replacing failed BP100G1 board	✅ Direct replacement	Configure setup to match existing equipment
♨️ Replacing failed BP100G2 board	✅ Direct replacement	Configure setup to match existing equipment
♨️ Replacing failed BP100G3 board	✅ Direct replacement	Configure setup to match existing equipment
♨️ Replacing failed BP100UX board	✅ Exact replacement	Match to existing Setup number
♨️ Spa with 1-pump and circ setup	✅ Setup 1 or 5	X-P expander needed in Setup 1
♨️ Spa with 1-pump, no circ (standard 240V)	✅ Setup 6 (default)	No expander needed
♨️ Spa with 2 pumps	✅ Setups 1 or 2 with X-P expander	X-P (PN 59232) must be installed
♨️ Spa with pump + blower	✅ Setups 3 or 4 with X-B expander	X-B (PN 59231) must be installed
♨️ 120V plug-in portable spa	✅ Setups 5, 6, or 7 only	Requires specific wiring and jumper changes
♨️ Spa with ControlMySpa Wi-Fi	✅ Supported	Wi-Fi module connects to J34 or J35; A7 must be OFF

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❓ Frequently Asked Questions

Q: How do I know if this board fits my spa? A: Check your existing board’s part number against the compatibility list. If your board shows BP100G1, BP100G2, BP100G3, or BP100UX, or any of the system numbers (59293, 59294, 59295, 59499), the G1310 is the correct replacement. 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 BP100UX was specifically designed by Balboa as the universal replacement for the entire BP100 board family.

Q: What is the difference between the 5.5kW and 4.0kW versions? A: The heater output capacity differs, but the main PCBA (G1310 / 59499) is the same for both. The heater assembly itself and the F3 fuse rating may differ. When ordering just the replacement circuit board (G1310), the board itself is the same; you need to retain your existing heater and configure the jumpers (J24, J31) to match it.

Q: Do I need a licensed electrician to install this? A: Yes. NEC Article 680 requires a licensed electrician for all spa electrical work in most US jurisdictions. A permit may also be required. Incorrect installation can cause fire, electrocution, or equipment damage.

Q: My spa ran on 120V — does this board support that? A: Yes, but only for Setups 5, 6, and 7. When configured for 120VAC, specific wiring changes are required, DIP Switches A2 and A3 must be OFF, jumpers J24 and J31 must be moved to 120V positions, and fuse F3 must be changed to the 0.16A slow-blow version (supplied with the system). Contact Parts4Tubs to confirm your setup is compatible.

Q: What is the difference between Setups 5 and 6? A: Both support 120V operation with a single 2-speed (Setup 6) or 1-speed (Setup 5) Pump 1 and no expander. The key difference is that Setup 5 includes a dedicated circulation pump for filtration and polling, while Setup 6 uses Pump 1 low-speed for heating with no circ pump.

Q: Do I need to purchase the expander board separately? A: If your spa uses two pumps or a blower (Setups 1–4), yes — you need to purchase the appropriate expander board: X-P (PN 59232) for Pump 2 or X-B (PN 59231) for a blower. The G1310 board comes with the mounting hardware pre-installed, but the expander board itself is a separate purchase. If your spa only uses a single pump with no blower (Setups 5–7), no expander is needed.

Q: Will my existing topside panel work with this board? A: Compatible panels include all TP200, TP400, TP500, TP600, TP800, TP900, and spaTouch™ series panels. If using graphic panels (TP800, TP900, spaTouch™), ensure DIP switch A7 is set to OFF (Standard Menus). Contact Parts4Tubs with your topside model if uncertain.

Q: What warranty is included? A: Balboa Water Group provides a 1-year limited warranty 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 voltage mismatches. Verify Setup number, J24/J31 jumper positions, DIP switch settings (especially A2/A3 for 120V systems), and sensor connections. Contact our technical support team for guided troubleshooting.

📥 Downloads & Resources

📄 Balboa BP100UX Tech Sheet (Official Manufacturer PDF) — Complete specifications, setup tables, wiring diagrams, DIP switch definitions, and fuse part numbers

🏆 Why Choose the Balboa BP100UX (G1310)?

✅ One Board Covers All Three BP100 Generations — Eliminates the need to identify whether you have a G1, G2, or G3 board; the G1310 is the correct replacement for all of them

✅ Factory-Fitted Expander Mounting Hardware — The board ships ready to accept the optional X-P or X-B expander; no drilling or enclosure modification needed

✅ Dual Voltage Flexibility — The only compact Balboa main board in its class that supports both 240VAC and 120VAC (Setups 5–7), covering plug-in portable spas and hardwired installations

✅ Full Smart-Technology Support — Supports ControlMySpa Wi-Fi, Balboa Bluetooth Audio (bba™ and bba™2), and audio/visual output — all from a single compact board

✅ UL Listed — North American safety certification through three UL System Models covering all heater configurations

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

✅ Broad Panel Support — From the simplest TP200 two-button panel to the full spaTouch™3 graphic display, every current Balboa panel works with this board

✅ 1-Year Manufacturer Warranty — Backed by Balboa Water Group

🤝 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 (X-P and X-B), sensors, heater kits, Wi-Fi modules, and more

✨ Summary

The Balboa BP100UX Circuit Board (G1310) is the genuine OEM replacement for the entire BP100 control board family — BP100G1, BP100G2, and BP100G3 — unified into one versatile, field-configurable board. With 7 software setups, dual 120V/240V capability, factory-fitted expander mounting hardware, support for pump and blower expansion, and compatibility with every Balboa topside panel including Wi-Fi and Bluetooth Audio, it is the complete, correct solution for restoring any BP100-series spa. UL listed, backed by a 1-year warranty, and available now from Parts4Tubs with expert technical support. Order today and get your spa back in action.

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.