🛠️ Master Spas® MS501S Replacement Circuit Board — X801024 — Balboa® 53620 — VS501 Series — P1-P2-CIRC-OZ-LT

Genuine OEM replacement circuit board for Master Spas® MS501S / VS501 Series control systems — used in Down East Spas® 1999–2006 and select Master Spas models through approximately 2010 — phone style cable connector.

⚠️ IMPORTANT — PLEASE READ BEFORE ORDERING

• Chip number verification required. The chip for this board is MS501SR1A (also listed as MS501SR1(x)). Locate the chip sticker near the center of your existing board and confirm before ordering. Do not order based on appearance alone.
• Board number to look for. You may see MS501SR1A printed on your old board. The board may also show V/N 22972_E as the PCB plate designation — this is normal and expected.
• DIP switch and voltage configuration required. This board is not plug-and-play. Correct voltage setup, component wire positioning, and DIP switch settings must be applied. Refer to the wiring schematic on the back of the spa pack cover.

📋 Product Overview

The Master Spas® X801024 is the OEM replacement circuit board for MS501S / VS501 Series control systems, manufactured by Balboa Water Group. The Balboa part numbers are 53620, 54355, and 54352. The control box associated with this board is Balboa 53619. The board uses the Balboa VS501 Series platform with Balboa’s patented M7® temperature and water flow sensing technology.

The board supports Pump 1 (P1), Pump 2 (P2), Circulation Pump (CIRC), Ozonator (OZ), and Spa Light (LT). It connects to the topside panel via a phone style cable. The board was used primarily in Down East Spas from 1999 through 2006 (with specific model ranges), and in various other Master Spas models generally through approximately 2010.

🌟 Key Features

✅ Genuine OEM replacement circuit board — Balboa-manufactured for Master Spas®
✅ Master Spa Part Number: X801024
✅ Balboa Part Numbers: 53620 / 54355 / 54352 | Control box: 53619
✅ Chip: MS501SR1A / MS501SR1(x)
✅ Platform: VS501 Series — Balboa M7® technology
✅ Outputs: P1 – P2 – CIRC – OZ – LT
✅ Connector: Phone style cable
✅ Board dimensions: 11″ W × 5″ H (27.94 cm × 12.7 cm)
✅ Used in Down East Spas® 1999–2002, 2005, 2006 and select Master Spas through ~2010
✅ Factory-new — never installed
✅ Manufacturer’s warranty included

🔧 Technical Specifications

Specification	Value
Master Spa Part Number	X801024
Balboa Part Numbers	53620 / 54355 / 54352
Control Box Number	53619
V/N (Version Number)	53620 / 54355 (also seen as 22972_E)
Chip Designation	MS501SR1A / MS501SR1(x)
Platform	VS501 Series — Balboa M7®
Outputs Supported	P1, P2, CIRC (Circulation), OZ (Ozonator), LT (Spa Light)
Connector	Phone style cable
Board Dimensions	11″ W × 5″ H (27.94 cm × 12.7 cm)
Board Type	New — genuine OEM
Returns	Non-returnable (all electronics final sale)
Warranty	Manufacturer’s warranty

⚠️ For voltage, amperage, heater output, pump configuration, and breaker specifications, refer to the wiring diagram and rating label on the back of your spa pack cover.

🔗 Compatibility Guide

Compatible Spa Brands and Models:

Down East Spas® — 1999–2002, 2005, 2006:

Model
Providence 2
Cape Cod 2
Windsor 2
Concord
Exeter 2
Portsmouth 2
East Hampton 2
Exeter SE
Windsor SE
Portsmouth SE
Bar Harbor 110v
Newport
Bristol
Providence S
D-3000
D-2000
D-1000
Portsmouth 1
Exeter 1
D-5000 2
D-5000
D-4000 2
D-4000

Other Master Spas models using the VS501 / MS501S control platform from 1999 through approximately 2010.

⚠️ The chip number is the definitive identifier. If your board shows MS501SR1A or MS501SR1(x), and the Balboa number 53620, 54355, or 54352 is present, this is the correct replacement board regardless of specific model or year.

How to Confirm Compatibility:

1. Locate the chip sticker near the center of your existing board — confirm it reads MS501SR1A or MS501SR1(x)
2. Confirm Balboa number 53620, 54355, or 54352 on the board if visible
3. Confirm control box number is 53619
4. Confirm phone style cable topside connection

Replaces These Part Numbers:

Part / Chip Number	Notes
X801024	Master Spa PN — this board
53620	Balboa PN
54355	Balboa alt PN
54352	Balboa alt PN
53619	Control box PN
MS501SR1A	Chip designation
MS501SR1(x)	Chip family designation

🛠️ Installation Requirements

Pre-Installation Checklist:

• [ ] Confirm chip reads MS501SR1A or MS501SR1(x) on existing board
• [ ] Confirm Balboa number (53620, 54355, or 54352) on existing board if visible
• [ ] Confirm control box number is 53619
• [ ] Confirm phone style cable topside connection
• [ ] Obtain the wiring schematic from the back of the spa pack cover before starting
• [ ] Photograph all wiring connections and DIP switch positions before removal
• [ ] Disconnect all power at GFCI breaker or service disconnect
• [ ] Allow capacitors to discharge before handling the board

Electrical Requirements:

Requirement	Specification
GFCI	Class A GFCI required — NEC Article 680
Ground & Bonding	Required — NEC Article 680
Dedicated Circuit	Required
Disconnect Box	Within line of sight of spa, at least 5 ft away
Voltage	Refer to spa pack wiring diagram and rating label
Wire Type	Copper conductors only

⚠️ Safety Warnings

• ⚠️ ALWAYS disconnect all power before circuit board work
• ⚠️ Licensed electrician installation required; NEC Article 680 compliance mandatory
• ⚠️ GFCI required; grounding and bonding required per NEC Article 680
• ⚠️ Do not order based on appearance — confirm chip reads MS501SR1A or MS501SR1(x)
• ⚠️ DIP switch and voltage configuration required — refer to wiring schematic on spa pack cover
• ⚠️ Damage from incorrect installation is NOT covered under warranty

❓ Frequently Asked Questions

Q: What outputs does this board support? A: This board supports P1 (Pump 1), P2 (Pump 2), CIRC (Circulation Pump), OZ (Ozonator), and LT (Spa Light). Confirm your spa’s actual configuration against the wiring schematic on your spa pack cover.

Q: What is the “V/N 22972_E” marking I see on the board? A: The physical PCB substrate may display “22972_E” — this is the Balboa PCB plate designation and is expected. It does not indicate a different product. The correct identifiers for ordering are X801024 (Master Spa PN), 53620 or 54355 (Balboa PN), and MS501SR1A (chip sticker).

Q: My Down East Spa is from 2003 or 2004 — does this board cover it? A: The confirmed model list covers Down East Spas from 1999–2002 and 2005–2006. The years 2003–2004 are not in the confirmed model list for X801024. Contact Parts4Tubs with your existing chip number for verification — if the chip reads MS501SR1A, the board is compatible.

Q: Does this board require a pressure switch? A: No. The VS501 Series uses Balboa’s M7® technology for integrated temperature and water flow sensing — no separate pressure switch is required.

Q: What warranty is included? A: Manufacturer’s warranty (Master Spas / Balboa).

✅ Why Choose the Master Spas® X801024 (Balboa® 53620)

✅ Genuine OEM replacement circuit board — Balboa-manufactured for Master Spas
✅ VS501 Series / MS501SR1A chip — supports P1, P2, Circ, Ozone, Light
✅ Phone style cable — matches VS501 Series MS501S topsides
✅ Down East Spas 1999–2006 broad coverage — 23 confirmed model names
✅ Balboa M7® technology — no pressure switch required
✅ Factory-new — never installed
✅ Manufacturer’s warranty included

🤝 Why Buy from Parts4Tubs

✅ Fast US shipping
✅ Chip number and compatibility verification — contact us before ordering if unsure
✅ Competitive pricing

⚡ Summary

The Master Spas® X801024 (Balboa® 53620/54355/54352, chip MS501SR1A, control box 53619) is the OEM replacement circuit board for MS501S / VS501 Series control systems. It supports P1, P2, CIRC, OZ, and LT outputs using Balboa M7® technology, connects via phone style cable, and measures 11″ W × 5″ H. Used in Down East Spas® from 1999–2002 and 2005–2006 (23 confirmed models) and other Master Spas through approximately 2010. The board may show V/N 22972_E or MS501SR1A on the existing board — this is normal. DIP switch and voltage configuration required after installation. Non-returnable; manufacturer’s warranty included.

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.