⚡ Balboa VS504SZ (MVS504SZ) Spa Circuit Board — Artesian Spa Series

OEM-quality circuit board engineered to restore full control to your Artesian or compatible spa

📋 Product Overview

The Balboa VS504SZ circuit board (Artesian part number OP33-0612-08CB) is a genuine OEM replacement PCB manufactured by Balboa Water Group for Artesian Spas and other compatible hot tub brands. Built on Balboa’s proven VS500Z platform with patented M7 temperature and water flow sensing technology, this board serves as the central control hub for your spa’s pumps, heater, lighting, ozone, and audio/visual systems.

Designed as a direct drop-in replacement for the MVS504SZ and a wide range of cross-referenced part numbers, this board is compatible with numerous Artesian Spa series including Resort, South Seas, Tropic Seas, and Tidal Fit models spanning from 2007 through 2015. It also serves as a compatible replacement for select Coleman and Vita Spa control systems. Whether you are replacing a faulty board or restoring an older spa to full working order, the VS504SZ delivers reliable, factory-tested performance backed by Balboa’s trusted engineering heritage.

✨ Key Features

✅ Genuine Balboa OEM Board — Factory-new, factory-tested VS504SZ PCB built on the VS500Z platform (PN 22972 Rev C/D/E) for proven reliability

✅ Dual Voltage Compatibility — Supports both 120V and 240V AC at 60Hz operation, configurable via wiring and DIP switch settings for US residential installations

✅ 2-Speed Pump 1 Control — Drives a 2-speed main jet pump for both high-speed hydrotherapy and low-speed filtration/circulation

✅ 1-Speed Pump 2 Control — Operates a dedicated secondary jet pump for additional massage zones

✅ 4.0 kW Heater Support — Controls an integrated 4.0 kW heater rated at 240V (approximately 1 kW at 120V operation)

✅ 12V Spa Light Output — Powers a standard 12V spa light with topside panel control

✅ Ozone Generator Ready — On-board ozone output connector (J29) with field-configurable voltage (120V or 240V)

✅ Optional Circulation Pump — Supports an optional dedicated circulation pump with multiple filtration modes configurable via DIP switches

✅ Expander Board Compatible — DIP switch A7 enables an optional expander board for a blower (X-B) or third pump (X-P/X-P231)

✅ A/V (Stereo) Output — Built-in audio/visual circuit for stereo system integration

✅ M7 Sensing Technology — Balboa’s patented dual-sensor system for accurate temperature monitoring and water flow detection

✅ Compatible Topside Panels — Works with Balboa VL700S, VL701S (Serial Standard), VX20, and VX40S auxiliary panels using 8-pin phone-style connector

⚙️ Technical Specifications

Specification	Value
Part Number (Artesian)	OP33-0612-08CB / 33-0612-08CB
Part Number (Balboa)	54638-01 / G1153 (current)
Board Type	Main PCB / Control Board
Base PCB	VS500Z — PN 22972 Rev C, D, or E
Chip Number	MVS504SZ(x) / VS504SZR1B
Input Voltage	120V or 240V AC (field configurable)
Frequency	60Hz (DIP switch A6 = OFF)
Service Type	Class A GFCI protected, 4-wire (hot, hot, neutral, ground)
Main Fuse	F5 — Class G Fuse, 30A
Heater Output	Up to 4.0 kW at 240V (approx. 1 kW at 120V)
Pump 1 Output	2-Speed
Pump 2 Output	1-Speed
Circulation Pump	Optional — must be same voltage as ozone (DIP switch A9 = ON when installed)
Ozone Output	Yes — J29 connector, field-configurable 120V or 240V
Light Output	12V standard spa light
A/V Output	Yes — 120V stereo circuit
Expander Board	Optional — supports blower (X-B) or 1-speed Pump 3 (X-P / X-P231) via DIP switch A7
Topside Connector	8-pin phone style (Serial Standard)
Terminal Block Torque	TB1: 27–30 in. lbs.
Additional Fuses	F7: 20A 250V (do not remove), 3A 250V, 0.3A 250V
Certifications	UL Listed (Balboa Water Group)
Warranty	1 year limited manufacturer warranty

🔄 Compatibility Guide

Compatible Artesian Spa Series

Series	Model Years
Resort	2007, 2008, 2009, 2010, 2011, 2012, 2013, 2015
Resort Elite	2008
South Seas	2008, 2010, 2011, 2012, 2013, 2014, 2015
Tropic Seas	2010, 2011, 2012, 2013, 2014, 2015
Tidal Fit	2010, 2012, 2013
Island Spas	Select models (verify part number)
Platinum	Select models (verify part number)

Also Compatible With

Brand	Notes
Coleman	Replaces part numbers 107-961, 107961, 107-068, 107068
Vita Spa	Replaces pack 107068 (verify configuration)
Clearwater	Select VS504SZ-equipped models
Divine	Select VS504SZ-equipped models

Compatible Topside Panels

Panel Part Number	Panel Name	Notes
52298-01	VL701S (Serial Standard)	Base panel — 6-button configuration only
VL700S	VL700S (Serial Standard)	6-button configuration only
VX20	VX20 Auxiliary Panel	2-button aux panel
VX40S	VX40S Auxiliary Panel	4-button aux panel

⚠️ Important: This board is only compatible with the 6-button configuration of VL700S/VL701S panels. Panels with backlighting (bulbs installed) should only be plugged into J1, not J2. If backlight bulbs are removed, both J1 and J2 may be used.

Replaces Part Numbers

Part Number	Description
OP33-0612-08CB	Artesian Spas OEM
33-0612-08CB	Artesian Spas alternate
54638-01	Balboa base PCBA
G1153	Balboa current replacement
55174	Alternate Balboa PN
55173-01	Alternate Balboa PN
55370-01	VS504SZ Control System
55372	Control System alternate
54637-01	System model VSP-VS504SZ-DCAH
55636	CS504SZ System
55637	CS504SZER1X
55257	Alternate PN
33-54638-K	Alternate PN
3-60-6033	Alternate PN
MX504SZ	Updated model designation
MVS504SZ	Original Artesian chip designation
VS504SZR	Board revision designation
VS514SZR1A	Replaced by VS504SZ
107-961 / 107961	Coleman
107-068 / 107068	Coleman Control System

⚠️ Always verify your existing part number and chip number before ordering. Many boards look similar but have different software or chips. The chip number is printed on the board itself and must match MVS504SZ(x) or VS504SZR1(x).

🎛️ Board Functions and Controls

Pump Control

Output	Function	Details
Pump 1	Main jet pump	2-Speed (high and low)
Pump 2	Secondary jets	1-Speed
Circ Pump	24hr circulation (optional)	Must be same voltage as ozone; DIP A9 must be ON
Pump 3 / Blower	Via expander board (optional)	DIP A7 = ON; use X-B for blower or X-P/X-P231 for pump

Heater Control

Feature	Specification
Heater Type	Integrated flow-through element
Max Output	4.0 kW at 240V (approx. 1 kW at 120V)
Hi-Limit Protection	Yes — dual M7 sensor system monitors temperature before and after heater
Heater Disable Mode	Configurable via DIP switches A2 + A10 (heater disabled while high-speed pumps/blower running in low amperage mode)

Additional Controls

Function	Capability
Lighting	12V standard spa light via topside panel; auto-off after 4 hours
Ozone	On-board connector J29; field-configurable 120V or 240V output
A/V (Stereo)	120V stereo audio circuit
Blower	Via optional X-B expander board (DIP A7 = ON)
Aux Panel	Supports VX20 (2-button) and VX40S (4-button) auxiliary panels

DIP Switch Configuration Summary

Switch	Function	OFF Position	ON Position
A1	Test Mode	Normal operation	Test mode enabled
A2 + A10	Amperage control	See Table 1 in tech sheet	Controls how many hi-speed pumps can run before heater is disabled
A3	J17/26 Pump	Disabled	Enabled for 1-speed pump
A4	Aux Freeze	Must be OFF	N/A
A5 + A9	Pump 1 speed / Circ mode	See configuration table	Multiple modes for circ pump and pump speed
A6	Frequency	60Hz (US standard)	50Hz
A7	Expander Board	Disabled	Enabled for blower or Pump 3
A8	Temperature display	Fahrenheit	Celsius

⚠️ WARNING: Main power must be turned OFF before adjusting DIP switches. After any DIP switch change (except A1), you must reset Persistent Memory via jumper J43 for new settings to take effect.

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🔧 Installation Requirements

⚠️ IMPORTANT: Installation must be carried out by a licensed electrician in compliance with NEC (National Electrical Code) and all applicable local codes.

Pre-Installation Checklist

• [ ] Verify the chip number on your existing board matches MVS504SZ(x) or VS504SZR1(x)
• [ ] Disconnect ALL power at the breaker/disconnect box
• [ ] Photograph existing wiring connections and DIP switch positions
• [ ] Allow capacitors to discharge (wait at least 5 minutes)
• [ ] Verify your topside panel is VL700S or VL701S (6-button Serial Standard)

Electrical Requirements

Requirement	Specification
Supply Voltage	120V or 240V AC / 60Hz (verify for your installation)
Service Type	4-wire: hot, hot, neutral, ground (for 240V)
GFCI Protection	Required — Class A GFCI (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)
Main Fuse	F5 — Class G, 30A (on-board)

Key Connection Points

Connector	Function
TB1	Main power terminal block — Neutral (White), Hot (Black), Hot (Red AC). Torque: 27–30 in. lbs.
J1	Primary topside panel connection (use for panels with backlighting)
J2	Secondary topside panel connection (only if backlight bulbs removed)
J29	Ozone generator output (120V or 240V, set via W2 jumper)
J47	Circulation pump output (voltage follows ozone setting)
J17/26	Optional pump output (enabled via DIP A3)
J12	Factory jumper — Pins 2 and 3 for VS50x software; DO NOT MOVE unless directed
J43	Persistent Memory reset jumper

Plug’n’Click Adaptor Note

Current production boards (G1153) include a 25696 Plug’n’Click adaptor for simplified heater installation. For compatibility with existing heater systems, a new heater or the 25263 adaptor may be required. The copper strap must be removed during installation to ensure proper electrical configuration.

💡 Tip: Label or photograph all connections and DIP switch positions before removing the old board. Copy DIP switch settings from your original board to the new one unless directed otherwise by the tech sheet.

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⚠️ Safety Warnings

Electrical Safety

• ⚠️ ALWAYS disconnect power at the breaker before any work on the spa control system
• ⚠️ Installation by a licensed electrician only — this is required by NEC and most local jurisdictions
• ⚠️ Ensure correct voltage supply (120V or 240V as required) — verify before connecting. Incorrect voltage will trip the breaker or damage components
• ⚠️ Verify GFCI protection is installed and working (required by NEC Article 680 for all spa/hot tub installations)
• ⚠️ Never operate the spa with covers removed from electrical components
• ⚠️ All wiring must comply with NEC and local electrical codes
• ⚠️ Tighten heater and terminal block screws to the torque specifications listed on the inside cover of the spa pack (TB1: 27–30 in. lbs.). Failure to tighten properly can cause heat/resistance arc burn damage to the circuit board

Water and Electrical Safety

• ⚠️ Ensure no water ingress into the control box — water damage will void the warranty
• ⚠️ Check all seals and gaskets during installation
• ⚠️ Never touch electrical components with wet hands
• ⚠️ Ensure adequate ventilation around the control box to prevent overheating

Post-Installation

• ⚠️ Test all safety features before use
• ⚠️ Verify hi-limit sensor function by checking the power-up display sequence
• ⚠️ Check for error codes on initial startup — the display should show the SSID numbers followed by “Gc” (heater 3–6 kW at 240V) or “GC” (heater 1–3 kW at 120V), then “Pr” for priming mode
• ⚠️ Do not remove fuse F7 (20A) — it is required for board operation
• ⚠️ Do not remove the black jumper on PCBA Rev D and E boards

🔍 Error Codes and Troubleshooting

Common Balboa VS Series Error/Display Codes

Code	Meaning	Solution
Pr	Priming Mode	Normal at startup. System is priming pumps. Press pump buttons to manually activate pumps during this period
– – –	Temperature Unknown	Normal when spa is in Economy or Sleep mode and pump has not cycled. Temperature will display after next filter cycle
OHH	Overheat — sensor detects 118°F	Spa shuts down. Do not enter the water. Allow water to cool below 108°F. Check for extended pump operation or high ambient temperature
OHS	Overheat — sensor detects 110°F	Spa functions disabled. System auto-resets when water cools below 108°F
HFL	Flow Problem	Substantial difference between temperature sensors detected. Check for low water level, suction restrictions, closed valves, trapped air, or pump prime issues
LF	Persistent Low Flow	Displays after 5th HFL occurrence within 24 hours. Inspect water flow path, clean filter, check for airlocks
SnS	Sensors Out of Balance	Temperature sensors differ by more than 3°F. May be temporary — if it persists for more than 1 hour, call for service
Sn	Sensor Failure	A temperature sensor or sensor circuit has failed. Contact a qualified technician
No COM	Communication Error	No communication between topside panel and circuit board. Check phone cable connection at J1 and topside. Try reseating the cable
ICE	Freeze Protection Active	System has detected potential freeze condition. All water devices activate automatically. Not an error — operational protection mode

Power-Up Display Sequence

Upon power-up, the topside display should show three numbers in sequence representing the SSID (System Software ID). The third number is the Software Version (should be 43 for this system). After the SSID display, you will see either “Gc” (240V heater mode, 3–6 kW) or “GC” (120V heater mode, 1–3 kW), followed by “Pr” indicating priming mode is active.

Basic Troubleshooting

No Power: Check the main breaker supplying power to the spa. Inspect the 30A Class G fuse (F5) on the circuit board. If blown, replace with an identical fuse only after identifying and resolving the cause of the overload.

Breaker Trips Immediately: A common cause is incorrect voltage configuration. If the board is set for 120V but connected to 240V service (or vice versa), the breaker will trip. Disconnect all components (heater, pumps, blower) and power on the board alone to isolate the issue. Verify the wiring matches the configuration on the spa pack cover.

Topside Panel Blank: Check the phone cable connection between the topside and J1 on the board. Ensure the cable is not damaged. With no topside connected, the spa should still start up, run the circulation pump on low speed, and begin heating to 100°F automatically.

⚠️ For complex electrical issues, always consult a qualified spa technician. Do not attempt to diagnose or repair issues beyond basic troubleshooting.

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🎯 Ideal Applications

Application	Suitability	Notes
♨️ Artesian Resort Series (2007–2015)	✅ Direct OEM replacement	Factory-original part number OP33-0612-08CB
♨️ Artesian South Seas Series (2008–2015)	✅ Direct OEM replacement	Same board with matching DIP switch configuration
♨️ Artesian Tropic Seas Series (2010–2015)	✅ Direct OEM replacement	Verify chip number matches MVS504SZ(x)
♨️ Artesian Tidal Fit (2010–2013)	✅ Direct OEM replacement	Verify configuration matches original
♨️ Coleman Spas (VS504SZ-equipped)	✅ Compatible replacement	Replaces 107-961, 107-068 and related part numbers
♨️ Vita Spa (VS504SZ-equipped)	✅ Compatible replacement	Replaces 107068 system — verify configuration

This board is designed for:

• Replacing faulty or damaged original MVS504SZ / VS504SZ boards
• Restoring full spa functionality after board failure
• Upgrading from older board revisions to the current G1153 production version
• Professional spa repair and maintenance

❓ Frequently Asked Questions

Q: How do I know if this board fits my spa? A: Check the chip number printed on your existing circuit board. It should read MVS504SZ(x) or VS504SZR1(x). Also verify the Artesian part number OP33-0612-08CB or any of the alternate part numbers listed in the compatibility section. If you are unsure, contact Parts4Tubs with your spa make, model, serial number, and a photo of your existing board.

Q: Is this an OEM or aftermarket board? A: This is a genuine OEM Balboa Water Group circuit board. It is factory-new, factory-tested, and has never been previously installed. The current production part number is G1153, which is the direct replacement for the original 54638-01.

Q: Do I need a licensed electrician to install this? A: Yes. NEC and most local codes require a licensed electrician for hot tub electrical work. A permit may also be required depending on your jurisdiction. Proper installation is critical for safety and to maintain warranty coverage.

Q: Will my existing topside panel work with this board? A: This board is compatible with Balboa VL700S and VL701S Serial Standard topside panels (6-button configuration only), as well as VX20 and VX40S auxiliary panels. The connection uses an 8-pin phone-style cable. If your existing panel uses a different connector type (such as MOLEX), it is not compatible with this board.

Q: Does this board work with 120V or 240V? A: The VS504SZ supports both 120V/60Hz and 240V/60Hz operation. The correct voltage is set during installation by wiring to the appropriate terminals on the board and configuring the DIP switches. Always verify your spa’s electrical service configuration before connecting power.

Q: What warranty is included? A: This board comes with a 1-year limited manufacturer warranty covering defects in materials and workmanship under normal use. The warranty does not cover damage from improper installation, misuse, water exposure, or electrical power surges. Contact Parts4Tubs for full warranty terms.

Q: What if I get error codes after installation? A: After installing a new board, the power-up sequence should display three SSID numbers, then “Gc” or “GC” (heater mode), then “Pr” (priming mode). If you see error codes, refer to the error code table above. The most common post-installation issue is incorrect voltage configuration, which can cause the breaker to trip. Always ensure DIP switches are configured to match your original board’s settings and reset Persistent Memory (J43) after any changes.

Q: What is the Plug’n’Click adaptor included with the new board? A: Current production VS504SZ boards (G1153) include a 25696 Plug’n’Click adaptor for simplified heater connection. If you are replacing an older board, you may need the 25263 adaptor for compatibility with your existing heater, or a new heater that uses the Plug’n’Click connection. The copper strap on the new board must be removed during installation.

Q: Can I add a blower or third pump to this board? A: Yes, with an optional expander board. Set DIP switch A7 to ON, then use an X-B expander board for a blower or X-P / X-P231 expander board for a third 1-speed pump, depending on amperage requirements.

📥 Downloads and Resources

📄 VS504SZ Official Tech Sheet (Balboa) — Complete wiring diagrams, DIP switch settings, and system configuration

🏆 Why Choose the Balboa VS504SZ Circuit Board

• ✅ Genuine OEM Balboa Part — Factory-new, factory-tested board with authentic Balboa engineering and the latest G1153 production revision
• ✅ Proven VS500Z Platform — Built on Balboa’s widely used and field-proven circuit board platform with M7 sensing technology
• ✅ Broad Compatibility — Direct replacement for over 20 different part numbers across Artesian, Coleman, Vita Spa, and other brands
• ✅ Flexible Configuration — Supports 120V or 240V operation, multiple pump configurations, optional circulation pump, blower, and expander board options via DIP switches
• ✅ Simplified Installation — Current production includes Plug’n’Click adaptor for easier heater connection
• ✅ 1-Year Manufacturer Warranty — Covered by Balboa’s limited warranty against defects in materials and workmanship

🤝 Why Buy From Parts4Tubs

• ✅ US-based company with dedicated local support
• ✅ Fast US shipping on in-stock items
• ✅ Expert technical advice from experienced spa specialists
• ✅ Competitive pricing on genuine Balboa OEM parts
• ✅ Full warranty support — we stand behind every board we sell
• ✅ Easy returns within 30 days (for eligible items)
• ✅ Compatible parts and accessories available including topside panels, sensors, and expander boards
• ✅ Help identifying the correct replacement board — send us a photo of your old board and we will confirm compatibility

⭐ Summary

The Balboa VS504SZ (OP33-0612-08CB) is a genuine OEM replacement circuit board for Artesian Resort, South Seas, Tropic Seas, Tidal Fit, and compatible Coleman and Vita Spa hot tubs. It controls 2-speed Pump 1, 1-speed Pump 2, a 4.0 kW heater, 12V spa light, ozone, and A/V systems with Balboa’s reliable M7 sensing technology. Backed by a 1-year manufacturer warranty and available with expert support from Parts4Tubs, this board restores your spa to full factory performance. Order today or contact us to verify compatibility for your specific spa model.