🛠️ Balboa VS510SZ Spa Circuit Board — G1154 (54372-03) — 240V Multi-Pump Serial Standard Spa Control

OEM-quality circuit board for reliable VS510SZ spa control and performance.

⚠️ IMPORTANT — PLEASE READ BEFORE ORDERING

• Identify your board by chip number. The VS510SZ board carries chips in the VS510SZR or VS510SR series. Do not order based on appearance alone.
• 240V only. This board operates on 240VAC/60Hz service only. It is not a dual-voltage board.
• 4.0kW heater rating. The VS510SZ system uses a 4.0kW heater — confirm your existing heater wattage before ordering.
• 1-speed Pump 2 requires Expander Board 53544. Pump 2 on this board is a 1-speed off-board output enabled by DIP A3 ON, and requires expander board 53544 (or 33-0029B-K). Each pump output is rated for a maximum of 12A.
• Viking Spa users: If replacing a board in a Viking Spa or other brand, confirm your pumps are rated for no more than 230V / 12A maximum.
• Older heater strap connection. This board uses the traditional copper strap heater connection. A Plug’n’click upgrade is available — see Installation for details.
• Circuit boards are non-returnable. Contact Parts4Tubs to verify compatibility before ordering.

📋 Product Overview

The Balboa VS510SZ circuit board (Current MPN G1154, Part Number 54372-03, Chip VS510SZR2D) is a genuine Balboa Water Group OEM PCB for the VS510SZ Serial Standard spa control system. Built on the VS500Z PCB platform (22972 Rev C or D), this board runs on 240VAC and supports a two-speed primary pump, a 1-speed secondary pump (via expander board 53544), a blower, ozone, 12V spa lighting, AV/stereo, and a 4.0kW heater at 240V.

The VS510SZ shares its DIP switch configuration with the VS500SZ and VS501SZ platforms. The 1-speed Pump 2 output is activated via DIP A3 (off-board pump enabled) and uses expander board 53544. A separate J17/26 output for blower or additional 1-speed pump can be activated via DIP A7. The board connects to Balboa VL700S, VL701S, and VL702S Serial Standard topside panels.

This board has been used in spas by Premium Leisure, Keys, Viking Spa, and other manufacturers that used the VS510SZ control platform.

💫 Key Features

✅ Genuine Balboa Water Group — G1154 / 54372-03 — OEM board for VS510SZ systems
✅ 240V operation — standard US hardwired spa service
✅ Two-Speed Pump 1 — 240V main jet pump
✅ 1-Speed Pump 2 — 240V, off-board via expander board 53544 (DIP A3 ON); 12A max
✅ Blower Output — 240V, 1-speed via J17/26 (DIP A7 ON)
✅ Circulation Pump Output — 240V optional, J47; shares voltage with ozone via W2
✅ Ozone Generator Output — 120V or 240V field-selectable via W2
✅ Spa Light Output — 12V at J20
✅ AV / Stereo Output — 240V, always-hot
✅ 4.0kW Heater Support — 240V heater at full rated output
✅ Persistent Memory (J43) — stores filter settings, set temperature, and heat mode
✅ Dolphin Remote Compatible — Full-Feature and Spa-Only (J1 or J2)
✅ VX20 and VX40S Aux Panel Support
✅ M7 Technology — no pressure switch or external sensors required
✅ 1-Year Manufacturer Warranty
✅ Made in the USA — Balboa Instruments, Inc.

⚙️ Technical Specifications

Specification	Value
Current Balboa MPN	G1154
OEM Part Number	54372-03
Previous Revisions	54372, 54372-01, 54372-02
Chip Number (current)	VS510SZR2D
Chip Numbers Also Replaced	VS510SZR1A, VS510SZR2, VS510SZR2A, VS510SZR2B, VS510SZR2C, VS510SR1A, VS510SR1B, VS510SR2B, HS200VSR2A, HS200VSR2B, HS200VSR2C, HS200M7, KEYS211DR1A, KEYS211DR1B, KEYS2110R1A, NW300R1A
PCB Part Number	VS500Z PN 22972 Rev C or D
System PN	54559-01
System Model	VSP-VS510SZ-DCAJ
Software Version	43
EPN	2765
SSID	100 — 65 — 43
Input Voltage	240VAC / 60Hz only
Service Required	4-wire (Hot, Hot, Neutral, Ground), GFCI-protected
Max Breaker Rating	50A
Heater Output	4.0kW @ 240VAC
Pump 1 Output	240V, 2-Speed; max 12A
Pump 2 Output	240V, 1-Speed; requires expander 53544 + DIP A3 ON; max 12A
Blower / Pump 3 Output	Via J17/26, DIP A7 ON; 1-speed
Circ Pump Output	240V optional, J47 — must match ozone W2 voltage
Ozone Output	120V or 240V at J29 via W2
Spa Light Output	12V at J20
AV / Stereo Output	240V, always-hot
Max Pump Current	12A per pump output
DIP Switches	Single Switchbank A: select positions A1–A10
Fuse (logic)	0.3A 250V
Fuse (F7)	20A 250V — DO NOT REMOVE
Fuse	3A 250V
Fuse (F5)	CLASS G 30A
Board Dimensions	Approximately 11 × 5 inches
TB1 Torque	27–30 in. lbs.
Wire Type	Copper conductors only
Heater Connection	Traditional copper strap; Plug’n’click upgrade available
Warranty	1 year (manufacturer)

⚠️ Heater wattage note: 4.0kW is the rated output at 240V. At 120V input, the heater would output approximately 1kW — however, this board requires 240V service and is not designed for 120V operation.

⚠️ J12 — DO NOT MOVE. Factory set to Pins 1–2 for VS51x/VS5xxS/VS5xxD software. Moving this jumper prevents the board from functioning correctly.

🔗 Compatibility Guide

⚠️ IDENTIFY BY CHIP NUMBER: Confirm your chip is in the VS510SZR or VS510SR family before ordering. Do not order based on board appearance.

Compatible Topside Panels:

Panel PN	Panel Name	Notes
53811	VL700S	PDF base panel; Overlay PN 11688
53189-01	VL701S (Serial Standard)	PDF base panel; Overlay PN 10430
54652	VL702S	PDF base panel; Overlay PN 11790
54547, 54548, 54681	VL600S variants	With Aux Panel required for 3rd component
54170	VL701S variant

ℹ️ Horizon-confirmed compatible panels for this board (54372-03):

• 58-138-1102: Serial Standard Digital (2-Jet, 1-Blower)
• 58-138-1103: Serial Standard Digital (2-Jet, No Blower)
• 58-138-1104: Serial Standard Digital — Jacuzzi F108/109 (1-Jet, 1-Blower)
• 58-138-1048: VL700S Digital (Jet 1, Jet 2, Blower, Light)

ℹ️ Panel connection note: Panels with backlighting (bulbs installed) must connect to J1 only. If backlight bulbs are removed, both J1 and J2 may be used.

Aux Panel Support:

Panel	Type
VX20	2-button aux panel — PDF-confirmed
VX40S	4-button aux panel — PDF-confirmed

Required Expander Board for Pump 2:

Item	Part Number	Description
Expander Board X-P	53544 / 33-0029B-K	Required for 1-speed Pump 2 (DIP A3 ON)

⚠️ The 1-speed Pump 2 output requires expander board 53544. This is an off-board relay board that mounts in the enclosure. If your spa currently has a working Pump 2, the expander board should already be installed — it may not need replacement separately.

Replaces / Cross-Reference Part Numbers:

Part Number	Description
G1154	Current Balboa MPN
54372-03	This board (current revision)
54372, 54372-01, 54372-02	Earlier revisions
33-54372-K	HydroQuip catalog number
33-0033-K / 33-0033	HydroQuip alternate numbers
9710-72	OEM catalog number
623556	OEM catalog number
54345	Related VS510SZ board
55036	Related variant
55099-01	HS200VS system board
55098-01	HS200VS control system
54559-01	System PN using this PCBA
56658	VS510SZ system PN
56875-01	Control system PN
G4154-01	Current control system G-number
53534 / 54376 / 53533	GVS510 variants (Silent Sentry Light NOT supported)
54371HC1 / 54371-01	Related control system
53753 / 53752	KEYS211D system
54344 / 54345	KEYS211D control system
54757	K211D4K system
10-175-3010	OEM catalog (Viking Spa)
3-60-0079	OEM catalog

Compatible Spa Brands / OEM References:

Brand	Evidence	Notes
Premium Leisure	hottuboutpost.com
Keys Spas	Chip KEYS211DR1A/B + cross-refs
Viking Spa	Amazon/SpaGuts listing note
HydroQuip	33-54372-K, 33-0033-K
HS200 system spas	Chips HS200VSR2A/B/C, HS200M7

⚠️ Viking Spa / Other Brands: If replacing in a Viking Spa or similar, confirm that all pump motors are rated for no more than 230V / 12A maximum. Pumps exceeding this rating may cause relay damage.

⚠️ Silent Sentry Light: Not supported when using boards from GVS510 variants (53534/54376/53533). If your spa has a Silent Sentry Light feature, contact Parts4Tubs before ordering.

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🎛️ Board Functions & Controls

Output Configuration (Setup 1 As Manufactured):

Output	Connector	Voltage	Notes
Pump 1	J1 / J2	240V, 2-Speed	Max 12A
Pump 2	Expander 53544	240V, 1-Speed	DIP A3 ON + expander board required; max 12A
Blower / Pump 3	J17/26	240V, 1-Speed	DIP A7 ON
Circ Pump	J47	Match W2	Must match ozone voltage (W2 setting)
Ozone	J29 + W2	120V or 240V	W2: Red AC = 240V; White AC = 120V
Spa Light	J20	12V	—
AV / Stereo	—	240V	Always-hot
Heater	HTR1/HTR2	4.0kW @ 240V	M7 sensors

⚠️ Ozone and Circ Pump Voltage Warning: W2 wire sets voltage for both J29 (ozone) and J47 (circ pump). They must always be set to the same voltage. Mismatched voltage will damage equipment connected to the circ pump connector.

DIP Switchbank A (PDF-CONFIRMED — Base Model VS500SZ/VS501SZ/VS510SZ):

Switch	OFF Position	ON Position
A1	Test Mode OFF (normal)	Test Mode ON — technician only
A2 + A10	See Table 1 — amp draw/heater control	See Table 1
A3	Off-board Pump 2: Disabled	Off-board Pump 2: Enabled (expander 53544 required)
A4	Aux Freeze — must remain OFF	must remain OFF
A5 + A9	See Circ Mode Table	See Circ Mode Table
A6	60Hz (US normal)	50Hz
A7	J17/26 Disabled	J17/26 Enabled (Blower or 1-speed Pump 3)
A8	Fahrenheit	Celsius

⚠️ A3 + A7 simultaneously ON: Panel button layout becomes incompatible — use only with compatible aux panel configuration.

Table 1 — Heater Amp Draw (A2 + A10):

A2	A10	Max HS Pumps/Blower Before Heater Disables
OFF	OFF	0
ON	OFF	1
OFF	ON	2
ON	ON	3

Circ Mode Table (A5 + A9):

A5	A9	Circ Mode	Pump 1 Speed
OFF	OFF	Non-circ	2-Speed
ON	OFF	Circ acts like P1 Low	1-Speed
OFF	ON	24 Hr with 3°F shut-off	1-Speed
ON	ON	24 Hr with 3°F shut-off	2-Speed

Panel Button Assignments:

DIP State	Button 5	Button 6	Button 7
A3 OFF, A7 OFF	Pump 1	Unused	Unused
A3 ON, A7 OFF	Pump 1	Pump 2	Unused
A3 OFF, A7 ON	Pump 1	J17/26	Unused
A3 ON, A7 ON	Pump 1	Pump 2	J17/26 ⚠️

Key Jumpers:

Jumper	Function
J12	Factory set — DO NOT MOVE. Pins 1–2 for VS51x/VS5xxS/VS5xxD software
J43	Persistent Memory: 2 pins = RESET; 1 pin = Enabled (normal)
W2	Ozone/Circ voltage: Red AC = 240V; White AC = 120V

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🔧 Installation Requirements

⚠️ Installation must be performed by a licensed electrician in compliance with NEC and all applicable local codes.

Pre-Installation Checklist:

• [ ] Confirm chip number is in VS510SZR or VS510SR family
• [ ] Record all DIP switch settings before removal
• [ ] Record W2 ozone voltage — confirm it matches circ pump voltage
• [ ] Confirm pump motors are rated ≤12A (especially for Viking and other non-standard brands)
• [ ] Disconnect all power at the GFCI breaker or disconnect
• [ ] Photograph all wiring and connections
• [ ] Allow 5 minutes after power-off for capacitor discharge
• [ ] Confirm enclosure is plastic — not for metal enclosures
• [ ] Do NOT move J12 jumper
• [ ] Check whether expander board 53544 is present and functional (if using Pump 2)
• [ ] Check heater strap condition — replace if worn; Plug’n’click upgrade available

Electrical Requirements:

Requirement	Specification
Supply Voltage	240VAC / 60Hz
Service	4-wire (Hot, Hot, Neutral, Ground)
Circuit Breaker	50A maximum
GFCI Protection	Class A GFCI required — NEC Article 680
Ground & Bonding	Required — NEC Article 680
Dedicated Circuit	Required
Disconnect Box	Within line of sight of spa, at least 5 ft from walls (NEC)
Wire Type	Copper conductors ONLY
TB1 Torque	27–30 in. lbs.

Heater Connection: This board ships with the older copper strap (screw-terminal) heater connection. To upgrade to Plug’n’click, use adapter PN 25696 (59-138-1155) on the board side and PN 25263 (60-138-1040) on the heater side. Remove the copper strap entirely after converting. This eliminates the arcing risk associated with older copper strap connections.

⚠️ DO NOT REMOVE Fuse F7 (20A 250V) — explicitly stated in the PDF.

Persistent Memory Reset (REQUIRED after any DIP switch change — except A1):

1. Power down the spa
2. Place jumper across J43 covering both pins
3. Power up the spa
4. Wait until “GC” displays on the panel
5. Power down again
6. Remove jumper from J43 (or move to cover 1 pin only)
7. Power up again

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🛡️ Safety Warnings

• ⚠️ ALWAYS disconnect all power before board work
• ⚠️ Licensed electrician installation required; NEC Article 680 compliance mandatory
• ⚠️ Class A GFCI required; equipment grounding and bonding required
• ⚠️ 240VAC only — 50A max breaker
• ⚠️ Ozone and Circ Pump must share W2 voltage — mismatch damages equipment
• ⚠️ DO NOT MOVE J12 — factory-set; moving disables the board
• ⚠️ DO NOT REMOVE Fuse F7 (20A) — per PDF warning
• ⚠️ Max 12A per pump — use pumps rated ≤12A only; Viking Spa and other brands — verify ratings before installing
• ⚠️ Do not enable A3 and A7 simultaneously unless panel is compatible
• ⚠️ Expander board 53544 is required to use Pump 2 — do not operate without it when A3 is ON
• ⚠️ Reset Persistent Memory (J43) after any DIP change — new settings will not take effect otherwise
• ⚠️ Circuit boards are non-returnable and special-order — verify before ordering

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🔍 Error Codes & Diagnostics

Power-Up Display Sequence:

Display	Meaning
SSID sequence (100 — 65 — 43)	Software Version 43 confirmed
“GC”	Heater 3–6kW range — normal for 240V with 4.0kW heater
“CG”	Heater 1–3kW range
Priming mode	Normal startup

Common VS-Series Error Messages:

Display	Meaning	Action
OH	Overheat	Cool spa; check hi-limit sensor
FLO / FL	Flow error	Check pump, filter, sensors
SN / SnA / SnB	Sensor failure	Check Sensor A/B connections
PS	Pressure switch fault	Check VAC connector
– – –	Frozen sensor or heater fault	Inspect sensors and heater

🎯 Ideal Applications

Application	Suitability	Notes
♨️ VS510SZ systems (chip VS510SZR*)	✅ Direct replacement	Confirm chip before ordering
♨️ Premium Leisure hot tubs	✅ Confirmed	OEM application
♨️ Keys Spas (KEYS211D chip)	✅ Confirmed	OEM application
♨️ Viking Spa	✅ Compatible	Pumps must be ≤12A
♨️ HydroQuip VS510 systems (33-0033-K)	✅ Confirmed	Same Balboa platform
♨️ HS200VS system spas	✅ Confirmed	Chips HS200VSR2A/B/C
♨️ VS501SZ upgrade	✅ Functional successor	Check VL600S panel compatibility
♨️ Jacuzzi F108/F109 panel systems	✅ Compatible	Horizon tech tip confirmed (58-138-1104)

❓ Frequently Asked Questions

Q: Why does this board have a 4.0kW heater if my previous VS board had 5.5kW? A: The VS510SZ system was designed for 4.0kW heater operation. If you’re replacing a VS501SZ (which used a 5.5kW heater), or another board with a higher heater rating, confirm the heater wattage matches your replacement board before ordering. Contact Parts4Tubs to verify.

Q: Why does Pump 2 need an expander board? A: The VS510SZ main PCB provides a 2-speed output for Pump 1 and the blower connection, but the 1-speed Pump 2 relay is off-board, provided by expander board 53544 (DIP A3 ON activates this). If your spa already has Pump 2 working, the expander board is already installed in the enclosure. You may only need to replace the main PCB.

Q: My pumps are rated at 15A. Can I use this board? A: No. Each pump output on this board is rated for a maximum of 12A. Pumps exceeding 12A will overload the relays and can cause relay or board damage. Confirm all pump ratings before installing.

Q: Can I use this board to replace a VS501SZ? A: The VS510SZ (G1154) is listed as a functional successor to the VS501SZ (54378-03). However, there are differences: the VS510SZ is 240V only (the VS501SZ was dual 120V/240V) and the VS510SZ is rated for 4.0kW (the VS501SZ was 5.5kW). Verify that your spa’s heater wattage and voltage supply are compatible before using the VS510SZ as a replacement for a VS501SZ board.

Q: The VL600S panel — does it work with this board? A: The VL600S is compatible with VS510SZ in basic configurations, but a 3rd component (Pump 2 or Blower) requires an auxiliary panel when using VL600S. Other panels such as VL700S, VL701S, and VL702S are more straightforward.

Q: Can I use a 60A breaker? A: No. Maximum breaker is 50A for this board. Do not upsize.

Q: Is the Plug’n’click adapter included? A: No — this board ships with the older copper strap heater connection. The Plug’n’click adapters (PN 25263 and PN 25696) are available separately as an upgrade. The newer “Genuine VS510SZ” (59-138-3016) includes the Plug’n’click adapter as standard.

Q: What is the newer replacement for this board? A: The current-production Genuine VS510SZ (59-138-3016) is the updated version that includes the Plug’n’click adapter. Contact Parts4Tubs to determine whether the older 54372-03 or the current Genuine VS510SZ is the right choice for your spa.

Q: What warranty is included? A: 1-year manufacturer warranty. Contact Parts4Tubs for full terms.

📑 Downloads & Resources

📄 Balboa VS510SZ Tech Sheet 54559-01 — Official PDF — Wiring diagram, DIP switch definitions, ozone/circ pump voltage warning, panel configurations, connector layout

⭐ Why Choose the Balboa VS510SZ (G1154 / 54372-03)

✅ Genuine Balboa Water Group OEM board — G1154, VS510SZR2D chip
✅ Multi-pump platform — 2-speed P1, 1-speed P2 (via expander), blower
✅ Wide compatibility — Premium Leisure, Keys, Viking, HydroQuip confirmed
✅ Jacuzzi F108/109 panel support — confirmed via Horizon tech tip
✅ AV/Stereo output included — 240V always-hot output
✅ 1-year manufacturer warranty — Balboa Water Group coverage
✅ Non-returnable — Parts4Tubs verifies chip and pump ratings before you order

🤝 Why Buy from Parts4Tubs

✅ Fast US shipping
✅ Expert technical advice from spa specialists
✅ Competitive pricing
✅ Full warranty support
✅ Compatible panels, expander boards (53544), and heater adapter cables available
✅ Pump amperage and chip verification before ordering

🔌 Summary

The Balboa VS510SZ PCB (G1154 / 54372-03, Chip VS510SZR2D) is the OEM replacement for VS510SZ Serial Standard spa control systems. Operating on 240V/60Hz with a 4.0kW heater, it controls a 2-speed Pump 1, 1-speed Pump 2 (via expander board 53544, DIP A3 ON), blower (DIP A7), ozone, spa light, and AV/stereo. Each pump output is rated for a maximum of 12A — verify pump ratings before installing, especially for Viking Spa and other brands. The ozone and circ pump connectors share voltage via W2 and must always be matched. J12 must never be moved. This is a special-order, non-returnable board — always reset Persistent Memory (J43) after any DIP switch change.

 

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.