How to Identify a Balboa Circuit Board (PCB) and Find the Right Replacement

Last updated: September 2026

If you’re reading this, chances are you’ve got a Balboa circuit board (PCB) that has burnt out or reached the end of its life, and you need a replacement. That’s where it gets confusing, because most Balboa boards look very similar, and the same model name can cover several different boards.

I’ve written this guide and made a video to help you identify your Balboa board properly, so you buy the right one first time.

Safety first

Turn the tub off at the isolator and the breaker, and make sure it can’t be switched back on, before you take the pack’s cover off. Don’t touch the board with the power on. If you’re not comfortable working inside a spa pack, take clear photos with the power off and let a qualified electrician or spa technician do the swap.

What to look for on a Balboa board

Since most Balboa boards look alike, there are a few specific things you need to check. This image shows the physical features to look for:

1. The model and part number

Start with the model and part numbers printed on the board. On the board in the image above, they’re in the bottom left: the model is GS500 and the part number is 22015_B. The position varies from board to board, but they’re always printed in a similar format. The letter or suffix after the part number is usually the revision, so write the whole thing down.

Some boards also carry a part number on a sticker, which can be the number you actually order by. For example, the parts4tubs.com listing for the Balboa GS500Z board (54510) says to check the sticker on the transformer, which should read 54510, rather than going by the “GS500Z” label in the corner of the board.

2. The software (chip) details

This is the most important check. The same model, such as the GS500, is used across a range of products, so the model number alone isn’t enough. The software loaded onto the board decides which pumps, blower, heater and topside it supports. You need to cross-reference the model number with the software.

In the image below you can see a Balboa BP601 board. The chip number and part number are clearly printed on it. The chip number tells you the software loaded onto the board.

Balboa’s tech sheets list the software for each system. The VS520SZ tech sheet, for example, gives the system model, the board (VS500Z, part number 22972, revision C or D), the software version and an EPN number. It also explains that at power-up the topside shows three numbers in a row, which are the SSID (System Software ID), and the third is the software version. So if your topside still works, power the tub up and note what it displays before the board fails completely.

3. The system model on the pack label

The label on the pack itself gives the full system model. On a newer BP601, for example, Balboa’s BP601G1 tech sheet lists CE system models such as BP6-BP601G1-RCA-3.0KW, along with the board part number (59104-02 for 3.0kW models), the software version and a configuration signature. That’s the easiest way to find the right tech sheet.

4. Voltage, frequency and heater

UK and European boards run on 230V at 50Hz. US boards are generally built for 60Hz, and many are 120V/240V. They’re not interchangeable. The GS500Z listing above, for instance, says it’s 230V 50Hz only and not for US systems, and that DIP switch A6 must be on for 50Hz. The heater rating matters too, because some boards come in versions for different heater sizes. The BP601G1, for example, has different board part numbers for 2.0kW and 3.0kW models.

5. Visual similarity

With new models and upgrades, the board’s appearance can change slightly. Aim for a replacement that looks as close as possible to your original, with the same connectors in the same places. But treat looks as a final check, not the way to choose.

Your identification checklist

What to record	Where to find it	Example
Board model	Printed on the board, often in a corner	GS500, BP601, VS500Z
Board part number and revision	Printed on the board, or on a sticker	22015_B, 54510
Software	Label on the chip, the EPN, or the SSID shown on the topside at power-up	Software version and EPN from the tech sheet
System model	Label on the outside of the pack	BP6-BP601G1-RCA-3.0KW
Supply	Pack label and tech sheet	230V 50Hz (UK/EU) or 60Hz (USA)
Heater	Pack label or heater tube	2.0kW, 3.0kW, 4.0kW, 5.5kW

Once you’ve got those, find your system on Balboa’s system tech sheets page, which is organised by series (BP, EL, GL, GS and VS, in 50Hz and 60Hz versions), and check the board and software match.

Common mistakes

• Ordering by the model name alone. “GS500” or “BP601” isn’t specific enough.
• Buying a US 60Hz board for a UK tub, or the other way round.
• Not photographing the connections before unplugging everything.
• Not fixing the cause. If a pump or light took the board out, a new board will go the same way. My Balboa configuration guide tells the story of the three boards I blew with a pool light.
• Forgetting the setup and DIP switches after fitting. A new board may not have your old settings. See How to configure a Balboa spa pack.

Board or whole pack?

If the board is hard to find, or costs nearly as much as a complete new pack, a new pack is often the better buy, especially on an older tub. I’ve covered that decision in Replace spa pack or just the circuit board? and choosing a new one in How to select a replacement spa pack. If your topside is the problem rather than the board, see Do I need to replace my topside control?

To understand what each socket on the board does, read How to read a spa pack wiring diagram and Hot tub wiring explained.

Where to buy a Balboa board

If you need a replacement Balboa board, have a look at parts4tubs.com in the USA, or parts4tubs.co.uk if you’re in the UK. Have your part number, software and system model ready.

FAQs

Where is the part number on a Balboa circuit board?

It’s printed on the board, often in a corner near the model name, and sometimes on a sticker (for example, on the transformer of a GS500Z board). Write down the full number, including any revision letter.

Are all Balboa GS500 boards the same?

No. The GS500 model is used across a range of systems with different part numbers, software and supply types. Match the part number and software, not just the model name.

How do I find my Balboa software version?

On many Balboa systems, the topside displays the SSID (System Software ID) at power-up, with the software version as the third number. It’s also listed in the tech sheet for your system, and on some boards it’s on a label on the chip.

Can I use a US Balboa board in a UK hot tub?

No. UK and European boards are built for 230V 50Hz, and US boards are generally 60Hz and often 120V/240V. Buy the version made for your supply.

Do I need to reprogram a new Balboa board?

Usually, yes. Check the setup number and DIP switches against your old settings and your equipment before you put the cover back on.

Stuck identifying your board? Post the numbers from your board and pack label in the comments below. I read them all.

Cheers,
Andi

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Thanks - Andi

 

Hi, Andi here. I own Buildahottub.com and also write all of the articles and info pages on the site. Some years back now, I built my own hot tub but struggled to find the information I needed. So, once my tub was complete, I started this website to help others in their own pursuit of hot tub and plunge pools DIY building information.

Fast forward to 2025, I've helped over 1400+ DIY customers just like you all over the world build hot tubs and pools. Have a good look around the site, there are lots of resources here. Please do get in touch if I can help you. - Cheers, Andi