⚡ Balboa Leisure Bay 500S Circuit Board — 53409 — Smart S-3 / Genius G-2.5 / G-3 Series Spa Control

Trusted replacement board for Leisure Bay Smart S-3, Genius G-2.5, and Genius G-3 spa control systems.

⚠️ IMPORTANT — PLEASE READ BEFORE ORDERING

• This item is currently on backorder. Stock is not immediately available. Estimated lead time is 2–10 business days before shipment. Contact Parts4Tubs to confirm current availability before ordering.
• Special-order, non-returnable. Circuit boards cannot be resold as new to another spa owner. Once ordered, this item cannot be returned or cancelled.
• Leisure Bay-specific design — single pump system. This board supports one pump (Pump 1), a 12V spa light, ozone, and a circulation pump. It does not have a Pump 2 relay output.
• Topside connector is an 8-pin (RJ-45) phone-style plug. This is a Leisure Bay-format connector, not the Balboa Molex connector used on VS, EL, or BP series boards.
• ⚠️ Non-Leisure Bay topsides require a custom adapter plate AND DIP switch #2 set to OFF. If you are replacing your topside with a standard Balboa VL-series panel, you must use a custom adapter plate AND turn DIP switch #2 off. Without both, the panel will not function correctly.
• Identify by board part number and chip number. Look for chip LB500SR1(x) on the white label on the board. The board part number 53409 should also appear on the board label.
• Contact Parts4Tubs before ordering to verify compatibility with your specific Leisure Bay spa model.

📋 Product Overview

The Balboa Leisure Bay 500S circuit board (MPN 53409, Chip LB500SR1E) is a Balboa Water Group-manufactured OEM replacement PCB designed exclusively for Leisure Bay Smart S-3, Genius G-2.5, and Genius G-3 series spa control systems. This board is built on a Leisure Bay-specific control platform using an 8-pin phone-style (RJ-45) topside connector, making it distinct from the standard Balboa VS or EL-series boards.

The LB500S board manages all core spa functions for the S-3 system: a single 2-speed jet pump, a 12V spa light, an ozone generator, and an optional circulation pump. It is a focused, reliable single-pump control board that restores full functionality to Leisure Bay’s Smart S-3 and Genius series spas.

As a legacy Leisure Bay OEM board, 53409 is available on a backorder / special-order basis only. The current replacement path (for new installations) uses the updated LB501S board (54341 / 54349). Contact Parts4Tubs for guidance on whether the original 53409 or the updated replacement board is the correct choice for your spa.

🌟 Key Features

✅ Genuine Balboa Water Group OEM board — 53409, Chip LB500SR1E
✅ Designed for Leisure Bay Smart S-3, Genius G-2.5, and Genius G-3 systems
✅ Pump 1 Control — 2-speed main jet pump output
✅ 12V Spa Light Output — dedicated spa light relay
✅ Ozone Generator Output — built-in ozone control
✅ Circulation Pump Output — optional circ pump support
✅ 8-Pin Phone-Style (RJ-45) Topside Connector — Leisure Bay OEM format
✅ Compatible with Leisure Bay G-2.5/G-3 topsides (native, no adapter needed)
✅ Compatible with standard Balboa VL-series panels (requires adapter plate + DIP #2 OFF)
✅ 1-Year Manufacturer Warranty
✅ Made by Balboa Water Group for Leisure Bay Spas

🔧 Technical Specifications

Specification	Value
OEM Part Number	53409
Chip Number (current)	LB500SR1E
Chip Numbers Also Replaced	LB500SR1D, LB500SR1C, LB500SR1B, LB500SR1A
Board Type	Leisure Bay OEM, LB500S platform
System Models	Smart S-3 / Genius G-2.5 / Genius G-3
Topside Connector	8-pin phone-style (RJ-45)
Pump 1 Output	2-Speed jet pump
Pump 2 Output	Not available — single-pump board
Spa Light Output	12V
Ozone Output	Yes
Circ Pump Output	Yes (optional)
Input Voltage / Breaker	Please refer to your spa’s equipment label or contact Parts4Tubs for confirmation
Heater Output	Please refer to your spa’s equipment label or contact Parts4Tubs for confirmation
Warranty	1 year (manufacturer)
Availability	Backorder — 2–10 business days lead time
Returns	Non-returnable

⚠️ Voltage and heater kW are confirmed from your spa’s system label (inside the equipment enclosure) or the owner’s manual. Contact Parts4Tubs with your spa model and system label information to verify before ordering.

🔗 Compatibility Guide

Compatible Spa Systems:

System	Model	Notes
Leisure Bay Smart S-3	S-3 Pack	✅ Primary application
Leisure Bay Genius G-2.5	G-2.5	✅ Primary application
Leisure Bay Genius G-3	G-3	✅ Primary application

⚠️ This board is designed specifically for Leisure Bay Smart S-3 and Genius G-2.5/G-3 series systems. It is not a universal Balboa VS-series board. Verify your system model before ordering.

Compatible Topside Panels — Native Leisure Bay (no adapter needed):

Panel PN	Description	Notes
58-138-1705	Leisure Bay G-2.5/G-3, 6 Button (P1, P2, Lt, Mode, Temp)	✅ No adapter required
_452327	Leisure Bay G2, 7-Button	✅ No adapter required
53432 / 307014	LB500S E8L SS, S-3, 5-Button	✅ Original native panel
53716	LB501S / G-2.5 / G-3, 6 Button	✅ Compatible

Compatible Topside Panels — Non-Leisure Bay Balboa VL-Series:

⚠️ All non-Leisure Bay topsides require BOTH a custom adapter plate AND DIP switch #2 set to OFF.

Panel PN	Description	Notes
58-138-3428	Balboa Genuine VL600S, 6 Button	✅ With adapter plate + DIP #2 OFF
58-138-3430	Balboa Genuine VL620S, 6 Button	✅ With adapter plate + DIP #2 OFF
58-138-3432	Balboa Genuine VL700S, 7 Button	✅ With adapter plate + DIP #2 OFF
58-138-3434	Balboa Genuine VL701S, 7 Button	✅ With adapter plate + DIP #2 OFF
58-138-3436	Balboa Genuine VL702S, 7 Button	✅ With adapter plate + DIP #2 OFF
58-138-4275	BWG VL600S	✅ With adapter plate + DIP #2 OFF

Sensors Recommended (sold separately):

Sensor PN	Description
59-138-1071	Sensor, Balboa, 24″ Temp/Hi Limit, 1/4″ Diameter, 2-pin
59-355-1044	Sensor, Temp/Hi-Limit, Balboa Water Group, M7™, 46″

Replaces / Cross-Reference Part Numbers:

Part Number	Description
53409	This board (Balboa OEM MPN)
54342	Alternate OEM cross-reference
LB 500S	Chip-based part reference
LB500SR1(x)	All chip version designations
53408 / 53408-01	System PN / Control System
54348	Control System PN
53352	Control Box PN
54340	Control Box PN

Current Replacement Boards (newer versions that also replace 53409):

PN	Description	Notes
54349 / 4054349	LB500S replacement board by Balboa	Current equivalent per SpaGuts
54341 / 054341	LB501S board — also replaces 53409	Updated replacement; uses same control box
53353 / 53353-01	Earlier LB501S board

ℹ️ Contact Parts4Tubs for guidance on whether the original 53409 or the updated 54341/54349 replacement board is the correct choice for your specific Leisure Bay spa system.

🎛️ Board Functions

Output Summary:

Output	Supported	Notes
Pump 1	✅ 2-Speed	Main jet pump
Pump 2	❌ Not available	Single-pump board — no second pump relay
12V Spa Light	✅ Yes	Dedicated light output
Ozone	✅ Yes	Ozone generator support
Circulation Pump	✅ Optional	Circ pump output supported

DIP Switch Note: When installing a non-Leisure Bay topside (any Balboa VL-series panel), DIP switch #2 must be set to OFF in addition to fitting the custom adapter plate. Failure to set DIP #2 to OFF when using a non-LB topside will result in incorrect panel operation.

Topside Connector Type: This board uses an 8-pin phone-style (RJ-45) connector for the topside panel — not the Molex-style connector found on Balboa VS or EL-series boards. Confirm your existing panel connector type before ordering.

🛠️ Installation Requirements

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

Pre-Installation Checklist:

• [ ] Confirm spa is a Leisure Bay Smart S-3, Genius G-2.5, or Genius G-3 system
• [ ] Confirm chip number on your existing board — must be LB500SR1(x)
• [ ] Confirm board part number (53409) on the board label
• [ ] If replacing with a non-LB Balboa VL topside: obtain custom adapter plate and plan to set DIP #2 OFF
• [ ] Disconnect all power at the GFCI breaker or disconnect
• [ ] Allow 5 minutes for capacitor discharge after power-off
• [ ] Photograph all wiring and connections before removal
• [ ] Confirm voltage supply from your spa’s system label (inside equipment enclosure)

Electrical Requirements:

Requirement	Specification
GFCI Protection	Class A GFCI — NEC Article 680
Ground & Bonding	Required — NEC Article 680
Dedicated Circuit	Required
Disconnect Box	Within line of sight, at least 5 ft from spa
Wire Type	Copper conductors only

⚠️ Confirm your spa’s specific voltage and breaker requirements from the system label on the inside of the equipment enclosure before installation.

🛡️ Safety Warnings

• ⚠️ ALWAYS disconnect all power before any board work
• ⚠️ Licensed electrician installation required; NEC Article 680 compliance mandatory
• ⚠️ Class A GFCI required; grounding and bonding required per NEC Article 680
• ⚠️ Non-LB topsides require adapter plate AND DIP #2 OFF — omitting either will result in incorrect operation
• ⚠️ This is a single-pump board — do not attempt to wire a Pump 2 to this board
• ⚠️ Confirm voltage from your system label before installation — do not assume
• ⚠️ Non-returnable and backorder item — verify compatibility before ordering
• ⚠️ Identify by chip number (LB500SR1x) and board PN (53409), not by appearance

🎯 Ideal Applications

Application	Suitability	Notes
♨️ Leisure Bay Smart S-3 pack	✅ Direct OEM replacement	Confirm chip LB500SR1(x)
♨️ Leisure Bay Genius G-2.5	✅ Compatible	Same S-3 pack
♨️ Leisure Bay Genius G-3	✅ Compatible	Same S-3 pack
♨️ Single-pump Leisure Bay spa — 12V light + ozone + circ	✅ Designed for this	Pump 1, Light, Ozone, Circ only
♨️ LB topside replacement (58-138-1705, _452327)	✅ No adapter needed	Native panel
♨️ Balboa VL topside upgrade	✅ With adapter plate + DIP #2 OFF	Both conditions required

❓ Frequently Asked Questions

Q: How do I confirm this is the right board for my Leisure Bay spa? A: Look at your existing circuit board for a white label showing the chip number (LB500SR1A through LB500SR1E) or the board part number 53409. Your control box may also be labeled 53408, 53408-01, or 54348. If you have any of these, this board is your match. Contact Parts4Tubs with your chip number or box number if you are unsure.

Q: Does this board support a second pump? A: No. The 53409 LB500S board supports one pump (Pump 1, 2-speed) plus 12V light, ozone, and optional circ pump. There is no Pump 2 relay on this board. If your Leisure Bay spa has two pumps, contact Parts4Tubs to identify the correct board for your system.

Q: I want to install a Balboa VL600S topside instead of my original Leisure Bay panel — what do I need? A: Two things are required: (1) a custom adapter plate to fit the Balboa panel mounting to the Leisure Bay panel cutout, and (2) DIP switch #2 must be set to OFF. Both conditions are required; neither alone is sufficient. Contact Parts4Tubs for adapter plate availability.

Q: What is the difference between 53409 and the newer 54341 or 54349? A: The 53409 is the original OEM Leisure Bay board. The 54341 (LB501S) and 54349 are updated replacement boards by Balboa that are compatible with the same control box. They may have minor differences in features or firmware. Contact Parts4Tubs for guidance on which version is most appropriate for your spa.

Q: Is this board in stock? A: This item is currently on backorder with an estimated lead time of 2–10 business days before shipment. Contact Parts4Tubs to confirm current availability.

Q: What warranty is included? A: 1-year limited manufacturer warranty. Contact Parts4Tubs for full terms.

✅ Why Choose the Balboa Leisure Bay 53409

✅ Genuine Balboa Water Group OEM board — chip LB500SR1E, original Leisure Bay specification
✅ Exact match for Smart S-3, Genius G-2.5, and G-3 systems — no programming changes needed
✅ Supports native Leisure Bay panels — 58-138-1705, _452327, 53432 without modification
✅ VL-series panel upgrade path — VL600S, VL700S, VL701S, VL702S with adapter plate + DIP #2 OFF
✅ 1-year manufacturer warranty
✅ Non-returnable — Parts4Tubs verifies compatibility before you order

🤝 Why Buy from Parts4Tubs

✅ Fast US shipping
✅ Expert technical advice — Leisure Bay and Balboa specialists
✅ Competitive pricing
✅ Full warranty support
✅ Compatible Leisure Bay topsides, sensors, and adapter plates available
✅ Chip number and control box verification before ordering

✨ Summary

The Balboa Leisure Bay 500S circuit board (MPN 53409, Chip LB500SR1E) is the OEM replacement PCB for Leisure Bay Smart S-3, Genius G-2.5, and Genius G-3 spa control systems. It is a single-pump board controlling Pump 1 (2-speed), a 12V spa light, ozone, and an optional circulation pump — there is no Pump 2 relay. The board uses an 8-pin phone-style (RJ-45) topside connector unique to the Leisure Bay format. Native Leisure Bay panels connect directly; all non-Leisure Bay Balboa VL-series panels require a custom adapter plate AND DIP switch #2 set to OFF. This item is currently on backorder (2–10 business days lead time) and is non-returnable. Confirm your chip number and spa system before ordering.

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.