Product Description

Balboa VS520Z Circuit Board 33-55602-K — Genuine Replacement PCB for Hot Tubs & Spas

Is your hot tub's control system acting up? Don't replace the whole spa — replace the board. The Balboa VS520Z Circuit Board (Part # 33-55602-K) is a genuine Balboa Water Group printed circuit board (PCB) designed to restore your spa's control system to full working order. Western Tub and Pool stocks this part new and ready to ship.

Shop and order at Western Tub and Pool.
Call us at 1-855-248-0777 or email fixmytub@gmail.com

What Is the Balboa VS520Z Circuit Board 33-55602-K?

The Balboa VS520Z PCB (33-55602-K / Board PN 55602) is the main printed circuit board for the VS520Z Duplex control system (System PN 55601). It is manufactured by Balboa Water Group — one of the most trusted names in spa control technology — and is built to manage all core functions of your hot tub's electrical system.

This is a new, genuine replacement board, not refurbished. It is a direct replacement for failed or damaged VS520Z circuit boards and is compatible with a range of Balboa VS Series spa control systems.

Key Features & Specifications

System Outputs

The VS520Z circuit board supports the following outputs:

• Pump 1 — 2-Speed
• Pump 2 — 2-Speed (requires X-P332 expander board, PN 55137)
• Blower — 240V (requires Aux Panel VX10, PN 55608)
• Ozone — 120V or 240V (field configurable)
• Spa Light — 12V
• Audio/Visual — 12V Stereo
• Heater — 5.5 kW at 240V
• Circ Pump — Optional (enabled via DIP switches A5 and A9)

Compatible Topside Control Panels

The Balboa VS520Z board is compatible with the following topside panels:

Compatible Panel Series: VL2XX Series, VL4XX Series

VS520Z System Reference

The VS520Z circuit board (55602) is part of the following confirmed Balboa system configuration:

Note: Always verify your system PN, board number, heater style, voltage, and topside panel compatibility before ordering. If you are unsure, contact us — we can help you confirm the correct part.

Hot Tubs & Spa Control Systems That Use the VS520Z

The Balboa VS520Z control system is used across a wide range of hot tub brands and spa manufacturers. If your spa runs a Balboa VS Series control pack, this board may be the correct replacement for your system. Common brands that use Balboa VS Series controls include:

• Cal Spa
• Coleman Spas
• Keys Backyard
• Hydro Spa
• Master Spas
• Great Lakes
• Nordic Spas
• Leisure Bay
• Viking Spas
• And many more private-label spa brands built on Balboa control systems

Not sure if this board fits your spa? Check your existing circuit board for the part number label (usually found on a white sticker on the front or back of the board), or send us your spa's make, model, and serial number and we'll help confirm compatibility.

DIP Switch Configuration Overview

The VS520Z board uses DIP Switch Bank A for system configuration:

• A1 — Test Mode (normally OFF)
• A2 + A10 — Control amp draw requirements
• A3 — Panel type selection (Mini vs. Digital Duplex)
• A4 — Aux Freeze (must be OFF)
• A5 + A9 — Pump 1 speed and Circ Mode settings
• A6 — Frequency (ON = 50Hz / OFF = 60Hz)
• A7 — Operating mode (Standard only vs. Std/Ecn/Sleep)
• A8 — Temperature display (ON = Celsius / OFF = Fahrenheit)

Important: Any time you change a DIP switch (other than A1), you must reset Persistent Memory for the new settings to take effect.

Frequently Asked Questions

What does the part number 33-55602-K mean?

The part number 33-55602-K refers to the complete Balboa VS520Z circuit board assembly. The board itself is identified as PN 55602, and the "K" suffix typically denotes a kit designation. Both numbers refer to the same product.

Is this a new or refurbished board?

This is a brand-new, genuine Balboa Water Group circuit board — not refurbished, not remanufactured.

How do I know if this board will fit my hot tub?

Check your existing circuit board for a part number sticker. If it shows 55602, 33-55602-K, or is labeled VS520Z, this is your replacement board. You can also send us your spa's make, model, and serial number, and we will confirm compatibility for you.

What if I can't find my part number?

No problem. Send a clear photo of your existing circuit board, along with your spa's make, model, and serial number, to fixmytub@gmail.com. Our team will help identify the correct part for you.

What heater does this system use?

The VS520Z system is designed to work with heater PN 58083 (5.5 kW at 240V).

Does this board require an expander for a second pump?

Yes. To run a 2-speed Pump 2, the X-P332 expander board (PN 55137) is required.

Does this board support a blower?

Yes, but an Aux Panel VX10 (PN 55608) is required for blower operation.

Can I install this board myself?

Many experienced spa owners do replace their own circuit boards. Balboa Water Group provides an installation video for reference. However, if you are unsure about electrical work, we strongly recommend hiring a qualified spa technician. Call us if you need guidance: 1-855-248-0777.

Do you ship this part?

Yes. Contact Western Tub and Pool to confirm availability and shipping options for your location.

Can't Find Your Part? We Can Help.

The Balboa VS520Z is one of the more sought-after circuit boards, and finding the right replacement can be frustrating — especially when you're not sure which board your spa uses.

Western Tub and Pool specializes in hard-to-find spa parts. If you've been searching without success, reach out to us directly:

• Email:fixmytub@gmail.com(include photos, make, model, and serial number of your spa)
• Phone: 1-855-248-0777

We're here to help you get your hot tub back up and running as quickly as possible.

Shop and Order at Western Tub and Pool

Get the Balboa VS520Z Circuit Board 33-55602-K from a trusted source. Western Tub and Pool stocks genuine Balboa replacement parts and is ready to assist you with part identification, ordering, and technical guidance.

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