Product Description

Balboa VS520SZ Circuit Board 33-55299-K — New OEM Replacement Part

Get your hot tub running again with a genuine Balboa VS520SZ circuit board. This hard-to-find replacement PCB is in stock at Western Tub and Pool — your trusted source for spa repair parts across North America.
[Shop and Order at Western Tub and Pool — Call 1-855-248-0777]

What Is the Balboa VS520SZ Circuit Board (33-55299-K)?

The Balboa VS520SZ Circuit Board, Part Number 33-55299-K (also known as VS520SZ-3W SER REV01), is a new, genuine printed circuit board (PCB) manufactured by Balboa Water Group. It serves as the main control board for VS520SZ-series hot tub and spa control systems, managing everything from jet pumps and heaters to lighting, ozone, and audio systems.

This board is a direct replacement for aging or failed circuit boards in a wide range of Cal Spas, Coleman, Clearwater, and other hot tubs originally built with the VS520SZ control system.

Product Specifications

Associated/Cross-Reference Part Numbers:
33-55151-K · 33-0033B-K · 55151 · 55151-01 · 55299-01 · G1157 · 389276 · 59-138-1687 · 9710-116

Compatible Chip Numbers:
VS520SZR1A · VS520SZR1B · VS520SZR1C · INFI10R1A

Compatible Topside Panels:
53189-01 · 53811 · 55252-01 · 51574-01 · VL501S · VL600 · VL701 · VL701S · VL702S

System Outputs & Controls

This circuit board supports the following hot tub components:

• 240V Pump 1 — 2-Speed (up to 13 Amps)
• 240V Pump 2 — 2-Speed (up to 13 Amps)
• 240V Blower — 1-Speed (up to 8 Amps)
• 120V Circulation Pump — 24-hour operation with 3°F shutoff
• 120V Ozonator — Connects to terminal J29
• 12V Spa Light — Connects to light terminal J20
• 120V AV/Stereo System — Connects to terminal J50
• 240V 5.5kW Heater — Primary heating element
• IR Receiver Module — Connects to terminal J1 or J2

Optional Expander Accessories Supported:

• X-O3 (1-speed pump output)
• X-P (blower output)
• X-2SP Kit (2-speed pump 2 — adapter PN 25339 required)
• X-P231 (high-amperage branch circuit protection)
• X-P332 (additional 2-speed pump output — PN 55137)

Hot Tub and Spa Models That Use This Board

The Balboa VS520SZ circuit board is used in the following hot tub brands and control systems:

Cal Spas

• All Cal Spas hot tubs originally equipped with a Balboa VS520SZ control system
• Verify your model by checking the control system ID label on top of your spa pack

Coleman Spas

• CO866L
• CO866B
• CO866DL
• CO756L
• CO756B
  (Compatible chip numbers: COLE2PDVR1A / COLE2PDVR1B)

Clearwater Spas

• All Clearwater Spas originally built with VS520SZ-series Balboa control systems

Compatible Balboa VS520SZ Control Systems

Not sure if this is the right board for your spa? Always verify compatibility by matching the Model Number on your control system's ID label before ordering. Incompatible boards can look nearly identical. When in doubt, call us — we're here to help.

Not Sure If This Is the Right Part? We Can Help.

The VS520SZ circuit board is a hard-to-find part, and getting the wrong one is a costly mistake. Before ordering, we strongly recommend confirming your part number.

Here's how to get the right answer fast:

1. Check your part number — Look for the model ID label on top of your spa's control box
2. Send us a photo — Email a clear picture of your existing board to fixmytub@gmail.com
3. Share your spa details — Include your hot tub's make, model, and serial number in your email
4. Call us directly — Our team is ready to help at 1-855-248-0777

We'll confirm compatibility and get you sorted quickly.

Frequently Asked Questions

What does the Balboa VS520SZ circuit board do?

The VS520SZ PCB is the brain of your hot tub's control system. It manages all major electrical components — jet pumps, heaters, lights, blowers, ozone systems, and more. When this board fails, your spa may stop heating, lose pump function, or shut down entirely.

Is this a genuine Balboa circuit board?

Yes. The 33-55299-K sold by Western Tub and Pool is a brand new, genuine Balboa Water Group circuit board, not an aftermarket imitation.

How do I know if my circuit board has failed?

Common symptoms of a failed Balboa VS520SZ circuit board include:

• Spa will not power on or keeps tripping the breaker
• Error codes on your topside display (e.g., FLO, OH, DR, HOT)
• Pumps or heater not responding to controls
• Intermittent or complete loss of control panel function
• Burnt smell or visible damage on the board

Can I install this circuit board myself?

Circuit board replacement requires knowledge of spa electrical systems. Improper installation or incorrect PCB selection voids the manufacturer's warranty and may damage other components. If you are not experienced with spa electrical work, we recommend hiring a qualified spa technician.

Does the board come pre-configured?

Configuration requirements (DIP switch settings, jumper positions, and voltage settings) vary by installation. Contact us before ordering and we can advise on pre-configuration options. Our team at Western Tub and Pool is happy to walk you through what you need.

What is the warranty on this circuit board?

This board comes with a manufacturer's limited warranty. Contact us at 1-855-248-0777 or fixmytub@gmail.com for full warranty terms and conditions.

Do you ship across Canada and the United States?

Yes. Western Tub and Pool ships spa parts across North America. Contact us for shipping options and delivery timelines to your location.

What if I can't find my part number?

No problem. Send us an email at fixmytub@gmail.com with photos of your existing board and your hot tub's make, model, and serial number. We'll identify the right part for you.

Shop and Order at Western Tub and Pool

Don't let a faulty circuit board keep you out of your hot tub any longer. Western Tub and Pool stocks genuine Balboa replacement parts — including hard-to-find boards like the VS520SZ 33-55299-K — so you can get back to soaking sooner.

Call us: 1-855-248-0777
Email us:fixmytub@gmail.com

Browse our full online catalogue for more Balboa circuit boards, spa packs, pumps, heaters, and accessories — or reach out directly and let our team find exactly what you need.

[Shop Now at Western Tub and Pool] [Email Us at fixmytub@gmail.com] [Call 1-855-248-0777]