⚡ Balboa VS510SZ Spa Circuit Board — G1154 (Serial Standard, VL Series)

Two pumps plus a built-in blower relay — the genuine Balboa VS510SZ replacement PCB with M7 technology and full VL panel compatibility

📋 Product Overview

The Balboa VS510SZ Circuit Board (G1154) — formerly 54372-03 — is the genuine Balboa Water Group main PCB for VS510SZ spa control systems. It represents the most fully-featured standard board in the VS (Value Series) Serial Standard family, built on the same VS500Z PCB platform as the VS504SZ but with a critical additional capability: a built-in on-board Blower relay (K1) that drives a blower or second pump directly from the main board — no expander required for that function.

In addition to a 2-speed Pump 1 (main heater pump), the VS510SZ supports an optional 1-speed off-board Pump 2 (via DIP switch A3), an optional third device via J17/26 (DIP switch A7), and an optional single-speed circulation pump. Ozone, 12V spa light, and audio/video outputs round out the feature set. Like all VS-platform boards, it uses Balboa’s M7 Technology, eliminating the need for an external pressure switch.

The VS510SZ was one of Balboa’s most widely deployed spa control boards and is found in hot tubs under many brand names, including models by Keys Backyard, Icon, Weslo, Hydro Spas, Viking Spas (with a pump voltage restriction), and others. It is compatible with Balboa VL700S, VL701S, VL702S, and VL600S Serial Standard topside panels.

⚠️ Important Installation Notes:

• New boards ship with Plug-n-Click heater adapter (PN 25696); copper strap on existing heater must be removed before connecting.
• For existing heaters, also order adapter PN 25263 (60-138-1040).
• Panel button layout options are DIP-switch-dependent — confirm A3/A7 settings match your spa before first power-up.
• ⚠️ Viking Spa and similar brands: If installing in a Viking Spa or other spa where this is not the original board platform, ensure all pumps are rated no more than 230V / 12A maximum.
• ⚠️ GVS500SZ / GVS510 spas with “Silent Sentry Light” feature: The Silent Sentry Light function is not supported by the G1154 board.

🌟 Key Features

✅ Built-In Blower Relay (K1) — No Expander Needed — On-board K1 relay directly drives a blower (or 1-speed secondary pump) from the main board in Setup 1; this is the defining advantage of the VS510SZ over the VS504SZ, which requires an expander board for blower support

✅ Three Configurable Output Channels — Pump 1 (2-speed, always on), off-board Pump 2 (1-speed, DIP A3 ON), and J17/26 equipment (DIP A7 ON) — supports the widest range of pump/blower combinations in the VS Serial Standard family

✅ Optional Circulation Pump — Single-speed circ pump via J47 when DIP A9 is ON; voltage must match ozone output

✅ M7 Technology — No Pressure Switch Required — Built-in flow and temperature sensing eliminates the need for an external pressure switch; supports heater mounting on either the suction or discharge side of the pump

✅ Genuine Balboa OEM PCB — Factory-new G1154 board with chip VS510SZR2D and software version 43; correct relay ratings and firmware for VS510SZ control systems

✅ Three VL Series Panel Options — Compatible with VL700S, VL701S, and VL702S Serial Standard panels — plus VL600S (with aux panel for third component); broadest panel support in the VS Serial Standard family

✅ 12V Spa Light with Mood/Fiber EFX Support — Standard 12V spa light output; also supports Mood EFX and Fiber EFX LED color accessories via the spa light terminal

✅ Ozone / UVC Output — Field-configurable for 120V or 240V via W2 wire; voltage must match circ pump connector (J47) when circ pump is installed

✅ Audio/Video (A/V) Output — 120VAC stereo output

✅ Includes Plug-n-Click Heater Adapter — Boards ship with PN 25696 adapter; copper strap removal from existing heater is required

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

🔩 Technical Specifications

Specification	Value
Current Manufacturer Part Number	G1154
Former Part Number	54372-03
System Part Number	54559-01
System Model	VSP-VS510SZ-DCAJ
Base PCBA	54372-02 (current tech sheet); G1154 = current production
PCB Platform	VS500Z PN 22972 Rev C or D
Chip Number	VS510SZR2D (latest); also VS510SZR1(x), VS510SZR2, VS510SR1(x) and others
Software Version	43
SSID	100, 65, 43
Board Platform	VS (Value Series) — Serial Standard
Board Technology	M7 (no external pressure switch required)
Board Type	Main PCB / Control Board
Input Voltage	240VAC, 60Hz
Service Amperage	40A
Circuit Breaker Maximum	50A maximum
Service Wiring	4 wires: hot (black), hot (red), neutral (white), ground
GFCI Protection	Class A GFCI required
Pump 1 Output	120V or 240VAC, 2-Speed — heater pump; configurable for circ pump use
Pump 1 Max Rating	12A maximum
On-Board Blower Output (K1)	120V or 240VAC, 1-Speed — drives Blower or 1-speed secondary device
Off-Board Pump 2 Output	1-Speed, via A3 ON — additional pump via external relay connection
J17/26 Output (A7 ON)	1 additional device (pump, blower, or accessory)
Circ Pump Output	120V or 240VAC, 1-Speed (optional) — DIP A9 must be ON; J47 connector
Max Pump Rating (all pumps)	12A per pump maximum
Ozone Output	120V or 240V configurable via W2; must match circ pump voltage when circ pump installed
Spa Light Output	12VAC — standard spa light and Mood/Fiber EFX accessories
A/V Output	120VAC stereo
Heater Output (240V)	4.0kW @ 240VAC (current system 54559-01); older system configurations (54371-01, 54371HC1) used 5.5kW — board hardware supports both
Heater Output (120V)	~1.0kW @ 120VAC (approx. 25% of 240V rated wattage)
Heater Connector	Plug-n-Click Molex (25696 adapter included); copper strap removal required
Existing Heater Adapter	PN 25263 / 60-138-1040
Terminal Block Torque (TB1)	27–30 in. lbs.
Main Fuse (F5)	CLASS G 30A
Fuse F7	20A — do not remove
Fuse (0.3A)	0.3A / 250V
Fuse F2	3A / 250V
Fuse F4	20A / 250V
Board Dimensions (approx.)	11 in. × 5 in. (279mm × 127mm)
Compatible Topside Panels	VL700S (PN 53811), VL701S (PN 53189-01, 54170), VL702S (PN 54652); VL600S (PN 54547, 54548, 54681 — 3rd component requires aux panel)
Panel Connection Type	Serial Standard — 8-pin phone-style connector
Expander Board (optional)	53544 / 330029B-K — for additional pump/blower capability beyond built-in outputs
Certifications	Please refer to manufacturer documentation or contact Parts4Tubs
Warranty	1 Year (Balboa Water Group)

⚠️ US Voltage Note: This board requires 240VAC / 60Hz North American service with 4-wire connection. Always confirm your spa’s electrical configuration before ordering.

⚠️ Pump Voltage Limit: All pumps connected to this board must be rated no more than 230V / 12A maximum. This is particularly critical when installing in Viking Spas or any spa where the original board was from a different platform.

⚠️ Voltage Rule: Ozone output and Circ Pump (J47) must be the same voltage. W2 wire sets ozone voltage (Red AC = 240V; White AC = 120V). Changing W2 also changes the circ pump connector voltage — all equipment on J47 must match.

---

🔄 Compatibility Guide

This Board Replaces These Part Numbers

Part Number	Description
G1154	Current Balboa manufacturer part number
54372-03	Former Balboa PCBA — most recent numbered revision
54372-02	Former Balboa PCBA revision (PDF base PCBA)
54372-01 / 54372	Earlier Balboa PCBA revisions — discontinued
54559-01	Balboa complete system (current, 4.0kW)
54371-01 / 54371HC1	Balboa earlier control system (5.5kW heater)
33-54372-K	Hydro-Quip kit number
33-0033 / 33-0033-K / 330033	Hydro-Quip cross-references
54345 / 54344	Earlier control system variants (KEYS211D)
55036 / 55099 / 55099-01	System/board variants
55098-01	Control system variant (HS200VSR2C with Special Lighting Module)
G4154-01	Balboa control system kit
G4154	Balboa alternate system designation
56875-01	Balboa control system
56658	System VS510SZ variant
54559	Earlier system version
54757	System K211D4K
53753	System 53752 (Chip KEYS211D)
54218-Z / 10-175-2002	Controller retrofit kit
59-138-1684 / 59-355-1684	Distributor cross-references
9710-72	Cross-reference
623556	Cross-reference
55196 / 55197 / GVS500SZ	GVS500SZ system — Silent Sentry Light NOT supported
53534 / 54376 / 53533 / GVS510	GVS510 system — Silent Sentry Light NOT supported
3-60-0079	Alternate cross-reference
HS200VS / HS200VSR2B / HS200M7	Chip/system designations
KEYS211DR1B / KEYS211D	Chip designations (Keys Backyard spa)
VS510SZR1A / VS510SZR2 / VS510SR2B	Chip designations
389275 / 53268 / 54377 / 54378-03	Additional cross-references
FVS501SZR1A / VS501SZRD2	Alternate chip designations
MVS504SZ	Alternate board designation

⚠️ GVS500SZ / GVS510 with Silent Sentry Light: The G1154 board is not compatible with the Silent Sentry Light feature found in some GVS500SZ and GVS510 spa configurations. The G1154 can be installed, but the Silent Sentry Light function will not operate.

⚠️ HS200VSR2C with Special Lighting Module: The Special Lighting Module that plugs into the 12V light socket of some HS200VSR2C systems is not compatible with the G1154 board.

Compatible Topside Panels

Panel	Part Number(s)	Notes
VL700S	53811	Connects to J1 only (if backlit, use J1 only)
VL701S	53189-01, 53189, 54170	Serial Standard — connects to J1 only
VL702S	54652	Connects to J1 only
VL600S	54547, 54548, 54681	3rd component requires aux panel (VX20 or VX40S)
VX20	—	2-button auxiliary panel
VX40S	—	4-button auxiliary panel

⚠️ Panels with backlighting (bulbs installed) must be connected to J1 only — never J2. If backlight bulbs are removed, both J1 and J2 can be used.

⚠️ Panel layout changes with DIP switches. When both A3 and A7 are OFF, buttons 6 and 7 are unused. When A3 is ON (Pump 2 enabled), button 6 = Pump 2. When A7 is ON (J17/26 enabled), button 7 = J17/26 equipment. When both A3 and A7 are ON simultaneously, button 6 = Pump 2 and button 7 = J17/26. However, some panel button layouts are not compatible when both A3 and A7 are ON — verify your specific panel overlay.

Compatible Spa Brands (Select Models)

Brand	Details
Keys Backyard	Systems with KEYS211DR1B chip
Icon Spas	Select VS510SZ-equipped models
Weslo	Select VS510SZ-equipped models
Hydro Spas	Select VS510SZ-equipped models
Viking Spas	Compatible — pumps must be rated NO MORE than 230V / 12A
Coleman (legacy)	Many customers replaced original Coleman control systems with VS510SZ packs
GVS500SZ / GVS510 models	Compatible — Silent Sentry Light NOT supported

This is a widely deployed platform used across many additional brands. Always verify by matching chip number and part number on the existing board.

---

🎛️ Board Functions & Controls

VS510SZ vs. VS504SZ — Key Differences

Feature	VS504SZ (G1153)	VS510SZ (G1154)
Built-in Blower Relay	❌ — expander required	✅ On-board K1 relay
SSID	100, 93, 43	100, 65, 43
Base PCBA	54638-01	54372-02/03
VL702S panel	❌ Not listed	✅ Supported
VL600S panel	❌ Not listed	✅ Supported (with aux panel)
3rd device (A7)	1-speed pump or expander blower	J17/26 equipment (pump or blower)
System PN	55370-01	54559-01

Pump & Equipment Configuration

Output	DIP Switch	Connector	Function
Pump 1 (2-speed)	A5 + A9	Main board	Primary heater pump — always active
Blower / 1-speed device	On-board K1	J4 / J2	Built-in blower relay — active in Setup 1
Off-board Pump 2	A3 ON	J17/26	Optional 1-speed second pump
J17/26 device	A7 ON	J17/26	Additional pump or J17/26 equipment
Circ Pump	A9 ON	J47	Optional circ pump — must match ozone voltage
Ozone	W2 wire	J29	120V or 240V — matches circ pump voltage
Spa Light	—	J12 area	12VAC standard + Mood/Fiber EFX
A/V Stereo	—	J50	120VAC

Circ Pump / Pump 1 Speed Table (DIP A5 + A9)

A5	A9	Circ Mode	Pump 1 Speed
OFF	OFF	Non-circ	2-Speed
ON	OFF	Circ — acts like Pump 1 Low	1-Speed
OFF	ON	24-hour with 3°F shutoff	1-Speed
ON	ON	24-hour with 3°F shutoff	2-Speed

Heater vs. High-Speed Pump Table (DIP A2 + A10)

A2	A10	High-Speed Devices Before Heat Disabled
OFF	OFF	0 — heat disabled with any high-speed device
ON	OFF	1
OFF	ON	2
ON	ON	3

DIP Switch Reference (Switchbank A)

Switch	OFF Position	ON Position
A1	Test Mode OFF (normal)	Test Mode ON
A2	See heater/pump table	See heater/pump table
A3	Off-board pump disabled	Off-board pump enabled (J17/26, 1-speed)
A4	Aux Freeze — must remain OFF	Do not set ON
A5	See circ/pump table	See circ/pump table
A6	60Hz (US — default)	50Hz (CE markets only)
A7	J17/26 equipment disabled	J17/26 equipment enabled
A8	Temperature in Fahrenheit	Temperature in Celsius
A9	See circ/pump table	See circ/pump table
A10	See heater/pump table	See heater/pump table

Key Jumpers

Jumper	Function
J12	Factory set — DO NOT MOVE. Pins 1–2 = VS51x/VS52x/VS5xxSZ/VS5xxDZ software. Pins 2–3 = VS50x software. G1154 ships with Pins 1–2.
J43	Both pins during power-up = Persistent Memory reset. 1 pin only = memory retained (normal operation).

⚙️ 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

• [ ] Verify existing board chip reads VS510SZR1(x), VS510SZR2, or VS510SR1(x) (any suffix)
• [ ] Confirm topside panel is a VL-series Serial Standard panel (VL700S, VL701S, VL702S, or VL600S)
• [ ] Photograph or record all DIP switch settings from the existing Switchbank A
• [ ] Note W2 wire position (ozone/circ voltage: Red AC = 240V; White AC = 120V)
• [ ] Note J43 jumper position (1 pin = normal; 2 pins during power-up = memory reset)
• [ ] Confirm whether blower, Pump 2, and/or circ pump are installed — note A3, A7, A5, A9 settings
• [ ] Check if spa is a Viking Spa or uses non-original pumps — verify pumps are ≤ 230V / 12A
• [ ] Check if spa has GVS500SZ / GVS510 Silent Sentry Light — this feature will NOT work on G1154
• [ ] Disconnect ALL power at circuit breaker and GFCI before starting
• [ ] Photograph all wiring before disconnecting anything
• [ ] Wait 5 minutes after power-off for capacitors to discharge
• [ ] Prepare heater adapter PN 25263 (60-138-1040) if retaining existing heater

Electrical Requirements

Requirement	Specification
Supply Voltage	240VAC / 60Hz
Service Amperage	40A
Circuit Breaker	50A maximum
GFCI Protection	Class A GFCI required — NEC Article 680
Service Wiring	4 wires: hot (black), hot (red), neutral (white), ground
Ground Connection	Equipment grounding and bonding — NEC Article 680
Terminal Torque (TB1)	27–30 in. lbs.
Dedicated Circuit	Required
Disconnect	Within line of sight of spa, minimum 5 ft from water (NEC)

Critical Post-Wiring Steps

1. Set Switchbank A DIP switches to match original configuration (or spa manufacturer spec)
2. Confirm DIP A4 is OFF — Aux Freeze must remain OFF
3. Confirm DIP A6 is OFF — 60Hz US service (ON = 50Hz CE mode only)
4. Set W2 wire for correct ozone/circ pump voltage (Red AC = 240V; White AC = 120V)
5. Set A9 ON if circ pump is installed
6. Reset Persistent Memory (J43 both pins during power-up) after ANY DIP switch change except A1
7. Remove J43 jumper (or move to 1 pin) after reset completes

💡 Tip: Write the configuration and DIP switch settings on the label inside the control box lid. When A3 and A7 are both ON, verify the topside panel button layout is compatible — some overlay configurations don’t support both outputs simultaneously.

---

🛡️ Safety Warnings

Electrical Safety:

• ⚠️ ALWAYS disconnect ALL power at the breaker and GFCI before any work
• ⚠️ Installation MUST be performed by a licensed electrician only
• ⚠️ This board requires 240VAC / 60Hz 4-wire service — verify before connecting
• ⚠️ Class A GFCI protection is mandatory per NEC Article 680
• ⚠️ Use copper conductors ONLY — no aluminum wiring
• ⚠️ A dedicated circuit and disconnect within line of sight of spa are required by NEC

Board-Specific Warnings:

• ⚠️ All pumps must be rated NO MORE than 230V / 12A — exceeding this causes component damage and potential fire
• ⚠️ Copper strap on existing heater MUST be removed before connecting — failure damages the board
• ⚠️ Silent Sentry Light (GVS500SZ / GVS510) is NOT supported — this feature will not function
• ⚠️ Special Lighting Module (HS200VSR2C) is NOT compatible — do not attempt to install
• ⚠️ Ozone and Circ Pump MUST be same voltage — changing W2 also changes J47 voltage; equipment damage results from mismatch
• ⚠️ DIP A4 must remain OFF — Aux Freeze switch must never be turned ON
• ⚠️ DIP A6 must be OFF for 60Hz US service — ON is for 50Hz CE markets only
• ⚠️ J12 jumper is factory set — DO NOT MOVE — incorrect J12 position causes software incompatibility
• ⚠️ Do not remove Fuse F7 (20A) — F7 must remain installed
• ⚠️ Persistent Memory MUST be reset (J43) after any DIP change (except A1) — changes will not take effect without this reset

Post-Installation:

• ⚠️ Verify correct SSID (100, 65, 43) displays on power-up — confirms VS510SZ software version 43
• ⚠️ Allow spa to complete Priming Mode before heater activates
• ⚠️ Test GFCI function, hi-limit sensor, and all safety features before use

---

🔍 Error Codes & Troubleshooting

Power-Up Display Sequence

Display	Meaning	Action
100, 65, 43 (SSID sequence)	System Software ID — confirms VS510SZ, software v43	Normal — proceed
HI (bars)	Heater configured for 3–6kW range (240V confirmed)	Normal at 240VAC
LO	Heater at 1–3kW range (120V detected)	Expected at 120VAC
PrE	Priming Mode starting	Normal — allow pumps to prime

Troubleshooting Quick Reference

Symptom	Likely Cause	First Step
Nothing operates	Breaker off / GFCI tripped	Reset GFCI and breaker; restore power
Blower not working	Wrong panel button, K1 relay fault, or setup	Verify blower wired to J4/J2 relay output; check A2/A10 heater disable setting
Pump 2 (off-board) not responding	A3 not ON; button 6 not assigned	Enable A3; reset Persistent Memory (J43)
No heat	A2/A10 set to disable heater with pumps	Check Table 1; adjust A2/A10 and reset Persistent Memory
DIP switch changes have no effect	Persistent Memory not reset	Two-pin J43 during power-up; wait for display; power off; remove jumper; power on
GFCI trips immediately	Wiring fault or copper strap not removed	Verify copper strap removed from heater; call licensed electrician
Ozone or circ pump damaged	W2 voltage mismatch	Verify W2 position and all J47 equipment match same voltage
Panel shows wrong temperature scale	A8 incorrect	A8 ON = Celsius; A8 OFF = Fahrenheit; reset Persistent Memory
SSID shows different numbers	Wrong chip or software — board mismatch	Verify SSID should be 100, 65, 43 for VS510SZ
Silent Sentry Light not working	Feature not supported by G1154	Silent Sentry Light requires the GVS-series board — not compatible

---

🎯 Ideal Applications

Application	Suitability	Notes
♨️ VS510SZ system — direct board replacement	✅ Exact replacement	Match chip VS510SZR(x); restore DIP settings
♨️ Keys Backyard spas (KEYS211DR1B)	✅ Compatible	Verify chip number and topside panel
♨️ Icon / Weslo / Hydro Spas	✅ Compatible — select models	Always verify by chip number
♨️ Viking Spas	✅ Compatible with restriction	All pumps must be ≤ 230V / 12A — verify before ordering
♨️ GVS500SZ / GVS510 spas	✅ Functional (with limitation)	Silent Sentry Light feature will not work
♨️ Spa needing 2-pump + blower (all on one board)	✅ Ideal — built-in blower relay	No expander needed for blower in basic configuration
♨️ Spa needing circ pump + ozone	✅ Supported	DIP A9 ON; W2 must match circ pump voltage
♨️ Spa with TP-series or Deluxe (DZ) panels	❌ Not compatible	VS510SZ supports Serial Standard VL panels only
♨️ Spas needing perimeter lighting	❌ Not supported	12V standard light output only

---

❓ Frequently Asked Questions

Q: How do I confirm this board fits my spa? A: Locate the chip label on your existing board. It must read VS510SZR, VS510SZR2, VS510SR, or a compatible designation listed in the cross-reference table above. Also confirm your topside panel is a VL-series Serial Standard panel. Never order by board appearance — always verify chip and part numbers.

Q: What makes the VS510SZ different from the VS504SZ? A: The VS510SZ has an additional on-board Blower relay (K1) built directly into the main PCB. The VS504SZ requires an external expander board for blower output. The VS510SZ also adds support for VL702S and VL600S panels, and uses a different PCBA (54372 vs 54638). In summary: the VS510SZ supports more output combinations from a single board.

Q: My spa is a Viking Spa — is there anything special I need to know? A: Yes. When installing the G1154 in a Viking Spa or any spa where the original board was from a different platform, you must confirm all pumps are rated no more than 230V / 12A maximum. Installing with pumps that exceed this rating risks component damage.

Q: Does this board support Silent Sentry lighting? A: No. The Silent Sentry Light feature found in some GVS500SZ and GVS510 spa configurations is not supported by the G1154 board. The board will install and operate all other functions normally, but the Silent Sentry Light will not work.

Q: Do I need a separate expander board for a blower? A: For the blower in the standard Setup 1 configuration, no — the VS510SZ has a built-in K1 relay for the blower output. However, if you need a fourth output (beyond Pump 1, Blower, and Pump 2), you can use an optional expander board (53544 / 330029B-K) via J17/26.

Q: Do I need to do anything special with my existing heater? A: Yes — the copper strap on your existing heater must be removed before connecting to this board. The new board ships with Plug-n-Click adapter PN 25696. If keeping your original heater, also order adapter PN 25263 (60-138-1040). Failure to remove the copper strap risks board damage and voids warranty.

Q: My DIP switch changes aren’t taking effect — what should I do? A: Reset Persistent Memory after any DIP switch change (except A1): power down, place a jumper across both J43 pins, power up, wait for the ready display, power down again, remove jumper (or move to 1 pin), then power up again.

Q: What warranty is included? A: Balboa Water Group provides a 1-year limited warranty against defects in materials and workmanship. Circuit boards are non-returnable once installed. Contact Parts4Tubs for warranty claim assistance.

---

📥 Downloads & Resources

📄 Balboa VS510SZ Tech Sheet — Official Manufacturer PDF (54559-01_97_A) — Complete wiring diagram, DIP switch definitions, jumper descriptions, ozone connection diagrams, panel configurations, and Persistent Memory reset instructions

🏆 Why Choose the Balboa VS510SZ (G1154)?

✅ Built-In Blower Relay — No Expander Required — Three output circuits on the main board (Pump 1, Blower/Pump 2, and J17/26) cover the most common 3-component spa configurations without additional hardware

✅ Widest VL Panel Compatibility in the VS Family — VL600S, VL700S, VL701S, and VL702S all supported; more options than any other VS Serial Standard board

✅ M7 Technology — No external pressure switch; heater can be installed on either side of the pump; reduced plumbing complexity

✅ Proven, Widely-Deployed Platform — One of the most installed spa circuit boards in North America; extensive service history, documentation, and technical support availability

✅ Genuine Balboa OEM Component — Correct chip (VS510SZR2D), software version 43, and relay ratings for VS510SZ systems; not an aftermarket substitute

✅ Comprehensive Cross-Reference Coverage — Replaces over 30 OEM and distributor part numbers across Keys Backyard, Icon, Viking Spas, Hydro Spas, GVS series, and many other brands

✅ Plug-n-Click Adapter Included — Ships with PN 25696; no extra parts order required for most new heater connections

✅ 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 Balboa spa parts
✅ Spa specialists available for VS510SZ compatibility and DIP switch configuration guidance
✅ Competitive pricing on genuine Balboa OEM circuit boards
✅ Full warranty support — we assist with Balboa warranty claims
✅ Easy returns within 30 days on eligible non-electrical items
✅ Related accessories in stock — VL topside panels, expander boards (53544), heater kits, sensors, adapters, and more
✅ Expert advice on VS510SZ vs VS504SZ vs BP501 upgrade options for your spa

✨ Summary

The Balboa VS510SZ Circuit Board (G1154) — formerly 54372-03 — is the genuine OEM replacement for VS510SZ spa control systems. Its built-in blower relay, three configurable output channels, optional circ pump support, and compatibility with VL600S through VL702S topside panels make it the most versatile board in the VS Serial Standard family. M7 Technology eliminates the need for an external pressure switch. Copper strap removal required on existing heaters. Viking Spa pump voltage restriction (≤ 230V / 12A) applies. GVS Silent Sentry Light not supported. Backed by a 1-year Balboa warranty

Finding and identifying a replacement Hot Tub Circuit Board (PCB)

If you are looking to replace a failed PCB on your Hot Tub’s spa pack, then quite often identifying the part that you need can be the hardest thing.

Firstly, you are looking for a model number on the actual circuit board itself. Having the model or serial of your hot tub is not going to help at this point, you need to find the number on the PCB itself.

Now, with certain brands of PCB, the number of the replacement PCB that you need is not going to match identically the one you are replacing. Why is that I hear you ask?

Well, normally, it is an updated version. This means that it might have updated firmware on the PCB or be a later revision. Normally, this means that the part number would be slightly different. This is usually indicated with a “12345678 -x” at the end of that part number where x indicated a firmware revision.

In some cases, there will be some following letters on the part number of the circuit board, “12345678 -x MAS” this can indicate that the PCB was used for an OEM meaning it was produced for a certain hot tub manufacturer and the letters identify the manufacturer.

This means if you source an original PCB, it will not have the letters, but will in most cases work just fine.

It can be confusing I know!

What if you can’t find a model number?

If you can’t find a model number on the PCB itself, then you need to look for a model number on the spa pack. Normally, there is a sticker on the outside of the spa pack that tells you the current ratings and input voltages etc and this will have a model number.

In general, most spa packs in the USA are manufactured by Balboa, Hydro-Quip, ACC or Gecko. I know I am generalising here, but if you have a spa pack that has the brand of your hot tub on, it will be an OEM so the key is identifying who made the original box.

From there, you can normally find an original PCB that you will be able to switch out.

For example, the Balboa VS (value series) is a very popular spa pack that has been used by multiple hot tub manufacturers under their own brand names. Whatever they have called it, strip it back and it is still a Balboa VS.

Visual Inspection

One of the most important things you can do when you are looking for a replacement is to visually inspect the PCB that you have versus the picture online of the replacement you are considering. They need to look the same even if there are the differences in firmware revisions or OEM part numbers, you should be visually replacing a PCB that looks like the one you have.

Configuring a replacement Hot Tub Circuit Board (PCB)

When you get a new PCB, you are more than likely going to need to configure it. Most PCBs have a number of different modes and setups that the can operate in. For this, you will need to manual or spec sheet to guide you.

For things like DIP switches, most of the time you can copy the settings from your original circuit board. You are looking for things like setting the voltage as a lot of PCBs can be configured to run on both 115V and 230V.

You may need to move jumpers or even wires to configure voltages – the key here is that you read the schematic and don’t expect the PCB to just work out of the box – it usually doesn’t.

Troubleshooting a Hot Tub Circuit Board (PCB)

Here are some common things you will see when you replace a PCB on a hot tub.

You press the buttons on the topside control and they don’t control the right parts (pumps or blower etc) – this is a mode configuration thing and you will either need to change some DIP switches on the PCB or an internal or low level programming mode on the topside control. Check the manual for how to do this.

You turn on the hot tub and it trips the breaker – it is not common for a new PCB to fail out of the box (I have not seen one yet!) However, a common mistake is that the voltage has not been set correctly. If it is set for 115V and then you try and turn it on, the current draw will be a lot more (twice) than expected and the breaker will trip.

To check this, unplug all of your kit – heater, pumps, blower and then turn on the PCB. If it trips with nothing plugged in, usually the voltage is incorrectly set and what is happening is that live current is being sent to the ground – because you have 4 wires into the PCB rather than 3. Current on the ground loop causes the trip. Check the settings to make sure it is configures for 230V.

It might not trip until you physically turn on a pump or a blower. As mentioned, if the pack is set to 115V and your pump is meant for 230V, it will draw twice the current at half the voltage and trip your breaker. Check the manual for info on how to set the voltage.