🔌 Balboa® Circuit Board for Jacuzzi® Millenium Spas — R327/R641 | 52211 — ME Serial Deluxe, Phone Plug

Genuine Balboa® circuit board for Jacuzzi® Millenium (ME) Series spas — Serial Deluxe type with phone plug, supporting 2 jet pumps.

⚠️ IMPORTANT — PLEASE READ BEFORE ORDERING

• Chip number identification is mandatory. Balboa circuit boards carry a chip number on a white sticker near the center of the board. The chip number for this board is R327 (variants: R327R1A, R327R1B, R327R1C, R327R1D). Do not order based on appearance alone — boards that look identical may carry different chip numbers and will not function correctly.
• This board is for Jacuzzi Millenium (ME) Serial Deluxe systems with a phone plug connection. Confirm that your existing board uses a phone plug and is of Serial Deluxe type before ordering.
• This system does NOT support a blower. The 52211 board and its compatible Serial Deluxe Digital topside (58-138-1116) support 2 jet pumps with no blower output. Do not use this board in a system that requires blower control.
• Dual voltage (115V/230V). This board operates at either 115V or 230V. Confirm your system’s voltage and use the appropriate transformer. Two separate transformer part numbers are available — one for 115V (59-138-1250) and one for 230V (59-138-1252).

📋 Product Overview

The Balboa® 52211 circuit board (chip R327, system PN R641R1) is the genuine replacement PCB for Jacuzzi® Millenium (ME) spa control systems using the Serial Deluxe board type with a phone plug topside connection. It is manufactured by Balboa Water Group for use in Jacuzzi Millenium branded spas.

The Serial Deluxe platform on which this board is based supports two jet pump outputs (no blower), ozonator, and spa light functions. It connects to the topside panel via a phone plug connector and operates at either 115V or 230V depending on the transformer installed. The sensor assembly (30337) is compatible with this board. This board is the replacement for the 52210 Balboa Control System used in Jacuzzi Millenium spas.

💫 Key Features

✅ Genuine Balboa® OEM replacement PCB — for Jacuzzi® Millenium (ME) spas
✅ Balboa Part Number: 52211 (also: R641R1)
✅ Chip Number: R327 (variants: R327R1A, R327R1B, R327R1C, R327R1D)
✅ Serial Deluxe board type — with phone plug
✅ 2 Jet Pump outputs — no blower output
✅ Dual voltage: 115V or 230V
✅ Phone plug topside connection
✅ Compatible with Serial Deluxe Digital topside (58-138-1116)
✅ Compatible with 30337 sensor assembly
✅ Replacement for the 52210 Balboa Control System
✅ Factory-new — never installed
✅ 1-year limited manufacturer’s warranty

⚠️ No blower output — this board does not support a blower. Confirm your system does not require blower control before ordering.

🔧 Technical Specifications

Specification	Value
Balboa Part Number	52211 (also: R641R1)
Chip Number	R327 (R327R1A / R327R1B / R327R1C / R327R1D)
Board Type	Serial Deluxe
System	Jacuzzi Millenium (ME) Series
Connector	Phone plug
Voltage	115V or 230V (dual voltage — transformer-dependent)
Jet Pump Outputs	2 jet pumps
Blower	Not supported
Replaces System	52210 Balboa Control System
Compatible Sensor	30337 Sensor Assembly
Board Type	New (factory original)
Warranty	1-year limited manufacturer’s warranty
Returns	Non-returnable

⚠️ Voltage is determined by transformer. Use 59-138-1250 (115V) or 59-138-1252 (230V) transformer as appropriate for your system. Confirm your spa’s supply voltage before ordering the board and transformer.

🔗 Compatibility Guide

Compatible Spa Systems:

This board is designed for Jacuzzi® Millenium (ME) branded spa control systems using the Balboa Serial Deluxe platform with phone plug and R327 chip family. Always verify the chip number on your existing board before ordering.

Replaces These Part / Chip Numbers:

Part / Chip Number	Notes
52211	Balboa MFR PN — this board
R641R1	Jacuzzi system PN
R641R1A	Earlier system revision
R327R1D	Current chip revision
R327R1C / R327R1B / R327R1A	Earlier chip revisions
9710-51	Catalog cross-reference PN
R797000	Cross-reference
10-175-2211	Alternate catalog PN

Compatible Topside Panel:

Part Number	Description
58-138-1116	Panel, Serial Deluxe Digital (2-Jet, No-Blwr)

Compatible Sensor Assembly:

Part Number	Description
30337	Sensor Assembly — compatible with this board
59-138-1060	Sensor, BWG, 96″ Temp 3/8″ dia, 31″ Hi-Limit, 1/4″ dia, 4-pin

Recommended Accessories:

Part Number	Description
59-138-1250	Transformer, Balboa, 115V/15V, 6-pin — for 115V systems
59-138-1252	Transformer, Balboa, 230V/15V, 6-pin — for 230V systems
60-155-1005	Surge Protector, Intermatic, 115V/230V

⚠️ Only one transformer should be installed depending on your system’s supply voltage. Do not install both. Confirm voltage before ordering.

🛠️ Installation Requirements

⚠️ Installation must be performed by a licensed electrician in compliance with NEC and all applicable local codes.

Pre-Installation Checklist:

• [ ] Locate the chip number on your existing board (white sticker, center of board)
• [ ] Confirm chip number is R327 (or R327R1A, R327R1B, R327R1C, R327R1D)
• [ ] Confirm board type is Serial Deluxe with phone plug
• [ ] Confirm system uses 2 jet pumps — no blower
• [ ] Confirm supply voltage (115V or 230V) and order appropriate transformer
• [ ] Note: board connects to topside via phone plug
• [ ] Photograph all wiring connections before removal
• [ ] Disconnect all power at GFCI breaker or service disconnect
• [ ] Allow capacitors to discharge before touching board

Electrical Requirements:

Requirement	Specification
Supply Voltage	115V or 230V / 60Hz
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
Transformer	6-pin — 115V or 230V version required (see above)
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 — chip number determines compatibility
• ⚠️ Chip number must be R327 family — confirm before ordering
• ⚠️ No blower output — for systems requiring a blower, this is the wrong board
• ⚠️ Install the correct voltage transformer (115V or 230V) matching your supply
• ⚠️ Damage from incorrect installation is NOT covered under warranty
• ⚠️ Non-returnable — verify chip number and compatibility before ordering

❓ Frequently Asked Questions

Q: How do I find my chip number? A: The chip number is printed on a white sticker placed on the logic chip near the center of your existing circuit board. Look for “R327” or a variant such as R327R1A, R327R1B, R327R1C, or R327R1D. Do not purchase any board without first confirming this number.

Q: What is the difference between the 52211 and R641R1? A: Both refer to the same Balboa circuit board for the Jacuzzi Millenium platform. 52211 is the Balboa Water Group part number; R641R1 is the Jacuzzi system-level designation. They are the same physical board.

Q: What topside panel works with this board? A: The confirmed compatible topside is 58-138-1116 (Panel, Serial Deluxe Digital, 2-Jet, No-Blwr). This topside connects via phone plug and supports 2 jet pumps with no blower button, matching this board’s capabilities.

Q: This board is listed as “Serial Deluxe with Phone Plug” — what does that mean? A: “Serial Deluxe” describes the type of Balboa control board — a mid-to-upper tier board within the Jacuzzi Millenium OEM product range, with full digital display and control capability. “With Phone Plug” describes the connector type used to connect the board to the topside panel (a phone-style cable plug), as opposed to other connector types used on different Balboa board families.

Q: Does my system need a new transformer? A: This board requires a 6-pin transformer. If your existing transformer is working correctly, it does not need replacement. However, if you are also replacing the transformer, confirm your supply voltage: use 59-138-1250 for 115V systems or 59-138-1252 for 230V systems.

Q: What warranty is included? A: 1-year limited manufacturer’s warranty. Damage from incorrect installation is not covered. Circuit boards are non-returnable.

✅ Why Choose the Balboa® 52211 (R327/R641)

✅ Genuine Balboa® OEM PCB — manufactured by Balboa Water Group for Jacuzzi Millenium spas
✅ R327 chip family — correct for Jacuzzi Millenium ME Serial Deluxe systems
✅ Phone plug connection — matches the original Jacuzzi Millenium Serial Deluxe topside
✅ Dual voltage 115V/230V — compatible with both common US supply voltages
✅ Factory-new — never installed
✅ 1-year limited manufacturer’s warranty

🤝 Why Buy from Parts4Tubs

✅ Fast US shipping
✅ Chip number verification support — contact us before ordering if unsure
✅ Compatible topside (58-138-1116) available
✅ Compatible transformers and sensors available
✅ Competitive pricing

⚡ Summary

The Balboa® 52211 circuit board (chip R327, Jacuzzi system PN R641R1) is the genuine OEM replacement PCB for Jacuzzi® Millenium (ME) spa control systems using the Serial Deluxe board type with phone plug. It supports 2 jet pump outputs — no blower — and operates at 115V or 230V depending on the transformer installed (59-138-1250 for 115V; 59-138-1252 for 230V). Compatible topside: 58-138-1116 (Serial Deluxe Digital, 2-Jet, No-Blwr). Compatible sensor: 30337. Always verify the chip number (R327 or R327R1x) before ordering. Non-returnable; 1-year limited manufacturer’s warranty.

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.