🛠️ Balboa LB501S Spa Circuit Board — 54341 (Leisure Bay OEM, Serial Standard)

Restore full functionality to your Leisure Bay spa with this genuine Balboa-manufactured replacement board.

🔌 Product Overview

The Balboa LB501S Circuit Board (Part Number 54341) is a genuine OEM replacement printed circuit board (PCB) manufactured by Balboa Water Group® specifically for Leisure Bay spa control systems. Leisure Bay was one of the most widely sold hot tub brands in North America, and this board — built to the same quality standards as the original — is the authoritative replacement for restoring full control to any Leisure Bay spa that uses the LB501S control system.

This Serial Standard board (chip ID LB501SZR1) manages all primary spa functions: dual jet pump operation, heating, spa lighting, ozone, and an optional 24-hour circulation pump. It is designed for 240V/60Hz US residential electrical service with no neutral wire required, making it a straightforward swap for the original LB501 and LB501S boards found in Leisure Bay G-2.5 and G-3 series spas.

The 54341 is also the modern replacement for several earlier discontinued Leisure Bay boards including the 53353 and 53409 series, consolidating the legacy LB501 board family into a single current-production part. Field installation requires voltage and DIP switch configuration to match your existing spa setup — professional installation by a licensed electrician is required.

✨ Key Features

• ✅ Genuine Balboa OEM Board for Leisure Bay Spas — Manufactured by Balboa Water Group (chip LB501SZR1); purpose-built for the Leisure Bay LB501S control system
• ✅ Replaces Multiple Legacy Leisure Bay Boards — Single current-production board covering the entire LB500S/LB501S chip family including LB50XSR1A, LB500SR1A, LB500SR1B, LB501SR1A, LB501SR1B, and LB501SZR1A
• ✅ Dual Pump Control — Supports Pump 1 and Pump 2 outputs; both individually voltage-configurable to 120V or 240V
• ✅ 240V / 60Hz / 40A US Service — Designed for US standard hard-wired 240V residential spa installations; no neutral wire required
• ✅ Serial Standard Communication — 8-pin phone cable topside connection with Serial Standard protocol; compatible with Leisure Bay G-2.5/G-3 topside panels
• ✅ Onboard Ozone Output — Supports ozone water purification system connection
• ✅ 12VAC Spa Light Output — Onboard low-voltage spa lighting control
• ✅ Optional Circulation Pump Support — Board supports an optional 24-hour circulation pump output when properly configured
• ✅ Field-Configurable Component Voltages — Pump, circ pump, and ozone voltages (120V or 240V) are set by wire position on the board; allows matching a wide range of existing component configurations
• ✅ 1-Year Manufacturer’s Warranty — Backed by Balboa Water Group’s standard 1-year limited warranty

📊 Technical Specifications

Specification	Value
Manufacturer Part Number	54341
Chip ID	LB501SZR1(x)
Board Model	LB501S
Board Type	Replacement Main PCB / Control Board — Serial Standard
OEM Brand	Leisure Bay (manufactured by Balboa Water Group)
Input Voltage	240VAC
Frequency	60Hz
Maximum Service Current	40A
Circuit Breaker Rating	50A max
Neutral Wire Required	No — dedicated dual-leg 240V service (3 wires: L1, L2, Ground)
Pump 1 Output	120VAC or 240VAC (voltage set by wire position)
Pump 2 Output	120VAC or 240VAC (voltage set by wire position)
Heater Output	Please refer to your system documentation or contact Parts4Tubs
Ozone Output	120VAC or 240VAC (voltage-configurable)
Spa Light Output	12VAC
Circulation Pump	Optional; voltage-configurable
Topside Connector	8-Pin Phone Cable
Topside Protocol	Serial Standard
GFCI Protection	Required — Class A GFCI per NEC Article 680
Warranty	1 year (Balboa Water Group manufacturer’s warranty)
Board Dimensions	See manufacturer documentation

⚠️ Heater output capacity varies by LB501S system variant. Refer to your spa pack system label or contact Parts4Tubs with your control box part number to confirm the correct heater specification for your installation.

ℹ️ US VOLTAGE NOTE: This board operates on 240VAC / 60Hz with no neutral wire required. Individual component outputs are configured by wire position. Always verify your spa’s electrical configuration before ordering.

🔗 Compatibility Guide

Compatible Leisure Bay Control Systems

Control Box Part Number	Description
53352	Leisure Bay LB501S Control System
54340	Leisure Bay LB501S Control System
54348	Leisure Bay LB501S Control System Variant
53408-01	Leisure Bay LB501S Control System Variant

Replaces These Board Part Numbers

Part Number	Description
53353 / 53353-01	Original Leisure Bay LB501SR1 Board (discontinued)
53409	Leisure Bay LB501S Board Variant (discontinued)
54349	Leisure Bay LB501S Board Variant
386860	Leisure Bay Board Variant
4054341	LMI alternate part number

Replaces These Chip Numbers

Chip ID	Notes
LB501SR1 / LB501SR1A / LB501SR1B	All LB501SR1 revisions
LB501SZR1A	LB501SZR1 revision A
LB500SR1A / LB500SR1B	LB500S chip family
LB50XSR1A	LB50X crossover family

Compatible Topside Panels

Part Number	Description
53716	Leisure Bay G-2.5 / G-3 Topside Control (Spaside)

⚠️ Always verify your board’s chip number from the white sticker near the board’s center — not the number printed on the board edge. Do NOT order by appearance alone.

⚠️ Because the 54341 covers multiple LB501S variants, some wiring adjustments may be required at installation to match your existing component voltage configuration. Refer to the wiring diagram on the back of your spa pack cover.

🎛️ Board Functions & Controls

Pump Control

Output	Function	Voltage Configuration
Pump 1	Primary jet pump	120VAC or 240VAC — set by wire position on board
Pump 2	Secondary jet pump	120VAC or 240VAC — set by wire position on board
Circulation Pump	Optional 24-hour circulation	Voltage-configurable; requires field setup

Heater Control

Feature	Detail
Heater Type	Electric element (M7 or compatible)
Heater Output Capacity	Varies by system variant — see manufacturer documentation or contact Parts4Tubs
Hi-Limit Protection	Dual temperature sensors (Sensor A and Sensor B)
Freeze Protection	Board activates pump at freeze threshold to protect plumbing

Additional Outputs

Function	Specification
Ozone	120VAC or 240VAC — voltage-configurable by wire position
Spa Light	12VAC

⚙️ Installation Requirements

⚠️ IMPORTANT: Installation must be carried out by a licensed electrician in compliance with NEC (National Electrical Code) Article 680 and all applicable local codes.

Pre-Installation Checklist

• [ ] Confirm chip number on existing board matches: LB501SZR1, LB501SR1, LB500SR1, or LB50XSR1A
• [ ] Note control box part number from system label: 53352, 54340, 54348, or 53408-01
• [ ] Disconnect all power at breaker and disconnect box before starting
• [ ] Photograph all wiring, wire terminal positions, and DIP switch settings before removing the old board — this is essential for this multi-variant board
• [ ] Record the voltage position of every component wire on the old board — must be replicated exactly
• [ ] Allow capacitors to discharge — wait at least 5 minutes after power-off

Electrical Requirements

Requirement	Specification
Supply Voltage	240VAC / 60Hz
Maximum Service Current	40A
Circuit Breaker	50A maximum
Wiring Configuration	3-wire: Line 1, Line 2, Ground (no neutral required)
GFCI Protection	Class A GFCI required — per NEC Article 680
Ground Connection	Equipment grounding and bonding required per NEC Article 680
Dedicated Circuit	Required
Disconnect Box	Required within line of sight of spa; at least 5 feet from spa walls per NEC

💡 Component voltages (Pump 1, Pump 2, Circ Pump, Ozone) are set by wire position on the terminal block — not by DIP switch. Replicate the exact wire positions from your original board. Incorrect wire positions will send wrong voltage to components and can cause pump damage or breaker trips.

⚠️ Safety Warnings

Electrical Safety

• ⚠️ ALWAYS disconnect all power at the breaker and disconnect box before any work
• ⚠️ Installation by a licensed electrician only — required by NEC and most local codes
• ⚠️ Verify 240VAC supply before connecting — this is NOT a 120V board
• ⚠️ Class A GFCI protection is mandatory per NEC Article 680
• ⚠️ Disconnect box must be within line of sight of the spa and at least 5 feet from spa walls per NEC
• ⚠️ Equipment grounding and bonding are mandatory per NEC Article 680
• ⚠️ Wire positions control component output voltages — incorrect configuration can damage pumps and trip breakers

Water & Electrical Safety

• ⚠️ No water ingress into the control box at any time
• ⚠️ Inspect all seals and gaskets during installation
• ⚠️ Never touch electrical components with wet hands

Post-Installation Safety Checks

• ⚠️ Verify GFCI breaker is operational before spa use
• ⚠️ Confirm both temperature sensors (Sensor A and Sensor B) are reading on startup
• ⚠️ Check topside display for error codes on initial power-up
• ⚠️ Verify heater activation and hi-limit response
• ⚠️ Confirm each pump operates at correct speed and voltage

🔍 Error Codes & Troubleshooting

Code	Meaning	Basic Action
OH / OHS	Spa overheat — water temp reached 110°F (43.3°C) limit	Allow spa to cool; check sensors and water flow
OHH / HH	Heater overheat — extreme temp at heater element	Power down; check flow, filters, and sensor connections
HFL / HL	Heater flow low — insufficient water flow through heater	Check water level, dirty filter, closed jets/valves, pump prime
LF / LOW FLOW	Verified low flow — heater disabled	Resolve flow issue; press any button to reset
dr / dry	Dry fire detected	Check water level and pump prime before restarting
FL / FLO	Flow switch fault	Check water level, filter, flow switch wiring
SnS / Sn	Sensors out of sync — A and B differ >2°F	If alternating with temp: monitor 1 hour; if flashing: contact technician
SnA / SA	Sensor A failure	Check connection; replace if faulty
Snb / Sb	Sensor B failure	Check connection; replace if faulty
ICE / IC	Freeze condition detected	Board auto-activates pump to protect plumbing
No COM	Topside-to-board communication error	Check 8-pin phone cable at both ends

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🎯 Ideal Applications

Application	Suitability	Notes
♨️ Leisure Bay G-2.5 series spas	✅ Direct replacement	Confirm chip number from board sticker
♨️ Leisure Bay G-3 series spas	✅ Direct replacement	Confirm chip number from board sticker
♨️ Control box 53352, 54340, 54348, 53408-01	✅ Compatible	Match by system label on spa pack
♨️ Replacing 53353 or 53409 boards	✅ Current-production replacement	Wire configuration may need adjustment

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❓ Frequently Asked Questions

Q: How do I confirm this is the right board for my Leisure Bay spa? A: Locate the white sticker near the center of your existing circuit board — it will show the chip number. If it matches any of these — LB501SZR1, LB501SR1, LB501SR1A, LB501SR1B, LB500SR1A, LB500SR1B, or LB50XSR1A — the 54341 is your replacement. Also confirm your control box label reads 53352, 54340, 54348, or 53408-01.

Q: Is this an OEM or aftermarket board? A: This is a genuine OEM replacement board manufactured by Balboa Water Group for Leisure Bay spa systems.

Q: Do I need a licensed electrician to install this? A: Yes. NEC Article 680 and most local codes require a licensed electrician for all hot tub electrical work. A permit may be required in your jurisdiction.

Q: Will my existing Leisure Bay topside panel work? A: Yes, if your topside is the Leisure Bay G-2.5/G-3 model (part number 53716). Contact Parts4Tubs if you are unsure about your panel.

Q: This board operates on 120V or 240V? A: The board requires 240VAC / 60Hz main supply — no neutral wire needed. Individual component outputs (pumps, ozone, circ pump) can each be set to 120V or 240V by wire position to match your existing components.

Q: The new board arrived with different wire positions than my old board — is that normal? A: Yes. The 54341 covers multiple LB501S variants so the factory wire setup may differ from your original. You must move component wires to match the positions on your old board. This is why photographing your old board before removal is essential. Contact Parts4Tubs if you need assistance.

Q: What warranty is included? A: Balboa Water Group’s 1-year manufacturer’s limited warranty. Circuit boards cannot be returned after installation except for verified warranty claims. Damage from incorrect installation or voltage configuration voids the warranty.

Q: What if I get error codes after installation? A: First verify all component wire positions are correctly set. Check both temperature sensor connections. Confirm water level and pump prime. Refer to the error code table above. Contact Parts4Tubs technical support if issues continue.

⭐ Why Choose the Balboa LB501S 54341

• ✅ Genuine Balboa OEM Board — Manufactured by Balboa Water Group, the industry’s leading spa controls company
• ✅ Maximum LB501 Family Coverage — One board replaces all LB500S/LB501S chip revisions — no more hunting discontinued part numbers
• ✅ Current Production — Active replacement for the discontinued 53353 and 53409 boards
• ✅ US Market Specification — 240V/60Hz; meets NEC Article 680 installation requirements
• ✅ Flexible Component Voltage — Each output individually configurable via wire position to match your existing pumps and accessories
• ✅ 1-Year Manufacturer’s Warranty — Backed by Balboa Water Group

🤝 Why Buy from Parts4Tubs

• ✅ US-based company with knowledgeable local support
• ✅ Fast US shipping
• ✅ Expert technical advice from spa specialists who know Balboa and Leisure Bay systems
• ✅ Competitive pricing on genuine OEM parts
• ✅ Full manufacturer warranty support
• ✅ Circuit boards: warranty claims only after installation — no standard returns
• ✅ Compatible parts available — topside panels, sensors, heater assemblies
• ✅ Help identifying the correct board — contact us with your chip number and control box part number

💡 Summary

The Balboa LB501S Circuit Board (54341) is a genuine OEM replacement PCB for Leisure Bay spa control systems using the LB501S/LB500S chip family. Rated for 240VAC/60Hz service at 40A max with no neutral wire required, it supports dual jet pumps with individually configurable component voltages, optional circulation pump, ozone, and 12VAC spa lighting via Serial Standard 8-pin topside communication. As the current-production consolidation part for the discontinued 53353 and 53409 boards, it is the correct replacement for Leisure Bay G-2.5 and G-3 series hot tubs. Always confirm your chip number from the board sticker — and photograph all wiring before removal.

Parts4Tubs is proud to be a Balboa Authorized Online Seller - make sure you only buy genuine Balboa parts from trusted sources.

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.