🔌 Marquis® VS501 Series Replacement Circuit Board — 600-6293 (LZM2UR1) — Balboa® 54343 — 2006–2008 Models

Genuine Balboa®-manufactured VS501Z circuit board for Marquis® spa control systems — LZM2UR1 chip family, 8-pin phone cable, Balboa M7® technology.

⚠️ IMPORTANT — PLEASE READ BEFORE ORDERING

• Chip number identification is mandatory. The chip for this board is LZM2UR1(x) — covering revisions LZM1UR1, LZM2UR1A, LZM2UR1B, and LZM2UR1C. Locate the white chip sticker near the center of your existing board. Do not order based on appearance alone.
• Model year confirmation required. This board covers specific 2006 and 2007 Marquis models (see compatibility table below) and all 2008 Marquis models. Spas from other years use different boards.
• Non-returnable. Circuit boards cannot be resold once purchased. Confirm chip number, model, and year before ordering.

📋 Product Overview

The Marquis® 600-6293 circuit board is the Balboa®-manufactured OEM replacement PCB for Marquis spa control systems using the VS501Z platform. The Balboa part number is 54343 (also 54343-01). The board uses the LZM2UR1 chip family and operates within Balboa’s Value Series (VS) control architecture, which uses Balboa’s patented M7® temperature and water flow sensing technology.

This board supports a 2-speed primary pump, a 1-speed secondary pump, 12V spa light, and ozonator. The control box housing this board carries Balboa part number 54342 (plastic box). The board connects to the topside panel via an 8-pin phone cable and is compatible with the 650-0635 topside control panel.

💡 Key Features

✅ Genuine Balboa®-manufactured OEM circuit board — for Marquis® VS501Z systems
✅ Marquis Part Number: 600-6293
✅ Balboa Part Numbers: 54343 / 54343-01
✅ Chip Number: LZM2UR1(x) — covers LZM1UR1, LZM2UR1A, LZM2UR1B, LZM2UR1C
✅ VS501Z platform — Balboa Value Series (VS)
✅ 2-speed Pump 1 output
✅ 1-speed Pump 2 output
✅ 12V Spa Light output
✅ Ozonator output
✅ 8-pin phone cable topside connection
✅ Balboa M7® technology — no pressure switch required
✅ For 2006 and 2007 specific models + all 2008 Marquis models
✅ Replaces 600-6288
✅ Factory-new — never installed
✅ 1-year limited manufacturer’s warranty

⚙️ Technical Specifications

Specification	Value
Marquis Part Number	600-6293
Balboa Part Numbers	54343 / 54343-01
Control Box Number	54342 (plastic box)
Chip Number	LZM2UR1(x) — covers LZM1UR1, LZM2UR1A, LZM2UR1B, LZM2UR1C
Platform	VS501Z — Balboa Value Series (VS)
Technology	Balboa M7® — no pressure switch required
Topside Connector	8-pin phone cable
Pump 1	2-speed
Pump 2	1-speed
Spa Light	12V
Ozonator	Supported
Compatible Control Box	54342 (plastic enclosure)
Replaces	600-6288
Board Type	New — factory original
Warranty	1-year limited manufacturer’s warranty
Returns	Non-returnable

⚠️ For voltage, amperage, heater output, and breaker specifications, refer to the wiring diagram and rating label inside your spa’s equipment compartment or the 54342 control box documentation.

🔗 Compatibility Guide

Compatible Marquis® Spa Models:

2006 Models:

Model
Quest
Ult630
Ult530
Ult418
Ult315
630
530
418
315
Retreat
Rendezvous

2007 Models:

Model
Quest
641R
520M
744E
319S
Ult630
Ult530
Ult418
Ult315
630
530
418
315
Retreat
Rendezvous
Envy / Envy II

2008: All Marquis models

⚠️ Always verify the chip number on your existing board against the list above before ordering, regardless of spa model and year. The chip number is the definitive identifier.

⚠️ 2-pump systems only. This board supports 2-speed Pump 1 and 1-speed Pump 2. If your spa has a different pump configuration, a different board may be required.

How to Confirm Compatibility:

1. Locate the chip sticker near the center of your existing board — confirm it reads LZM1UR1, LZM2UR1A, LZM2UR1B, or LZM2UR1C
2. Confirm your spa model and year match the list above
3. Confirm topside uses 8-pin phone cable connection
4. Confirm board is housed in a plastic control box (Balboa 54342)

Compatible Topside Panel:

Part Number	Notes
650-0635	Marquis compatible topside — mates to this board

Replaces These Part / Chip Numbers:

Part / Chip Number	Notes
600-6293	Marquis PN — this board
54343 / 54343-01	Balboa board PN
600-6288	Older Marquis board replaced by 600-6293
LZM2UR1	Base chip (no suffix)
LZM2UR1A	Chip revision A
LZM2UR1B	Chip revision B
LZM2UR1C	Chip revision C
LZM1UR1	Earlier chip family also covered

🛠️ Installation Requirements

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

Pre-Installation Checklist:

• [ ] Confirm chip number (LZM1UR1, LZM2UR1A, LZM2UR1B, or LZM2UR1C)
• [ ] Confirm spa model and year match compatibility list above
• [ ] Confirm 8-pin phone cable topside connection
• [ ] Confirm board is in a plastic Balboa 54342 enclosure (not metal)
• [ ] Photograph all wiring and DIP switch positions before removal
• [ ] Disconnect all power at GFCI breaker or service disconnect
• [ ] Allow capacitors to discharge before handling 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 equipment label inside control box
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
• ⚠️ Chip number must be LZM1UR1 or LZM2UR1(x) — confirm before ordering
• ⚠️ Plastic control box only — this board is for the 54342 plastic enclosure; do not install in a metal box
• ⚠️ 2006–2008 Marquis models only — other years and brands use different boards
• ⚠️ Damage from incorrect installation is NOT covered under warranty

❓ Frequently Asked Questions

Q: What does VS501Z mean in the product description? A: VS501Z is the Balboa Value Series (VS) control platform used in this board. Balboa manufactured this board to Marquis specifications for use in their spa lineup. The VS platform uses Balboa’s M7® integrated sensor technology, which means no separate pressure switch is required.

Q: My 2006 or 2007 Marquis model isn’t on the list — does this board still fit? A: The list of compatible models provided is based on documented sources from multiple authorized retailers. If your model is not listed, contact Parts4Tubs with your chip number (LZM2UR1 or variant) and we will help confirm compatibility before you order.

Q: Does this board cover all 2008 Marquis models? A: Based on Hot Tub Outpost documentation, all 2008 Marquis models are covered. However, always confirm by checking the chip number on your existing board — chip number LZM2UR1(x) confirms this is the correct board.

Q: What topside panel works with this board? A: The confirmed compatible topside is 650-0635. Contact Parts4Tubs to confirm compatibility if your existing topside differs.

Q: Does this board require a pressure switch? A: No. The VS501Z platform uses Balboa’s M7® technology for integrated temperature and water flow sensing — no pressure switch is required.

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 Marquis® 600-6293 (Balboa® 54343)

✅ Genuine Balboa®-manufactured OEM PCB — for Marquis VS501Z systems
✅ LZM2UR1 chip family — covers all confirmed revisions
✅ Confirmed model list — 2006, 2007, and all 2008 Marquis models
✅ 2-speed P1, 1-speed P2, light, ozone outputs
✅ Balboa M7® technology — no pressure switch needed
✅ 8-pin phone cable — direct match for 54342 system
✅ Factory-new — never installed
✅ 1-year limited manufacturer’s warranty

🤝 Why Buy from Parts4Tubs

✅ Fast US shipping
✅ Chip number and model compatibility verification available
✅ Compatible topside 650-0635 available
✅ Competitive pricing

⚡ Summary

The Marquis® 600-6293 circuit board (Balboa® 54343/54343-01, chip LZM2UR1) is the OEM replacement PCB for specific 2006 and 2007 Marquis models and all 2008 Marquis models, based on the VS501Z platform using Balboa M7® technology. It supports 2-speed Pump 1, 1-speed Pump 2, 12V spa light, and an ozonator. The board uses an 8-pin phone cable for topside connection and is housed in the plastic 54342 Marquis control box. Compatible topside: 650-0635. Always verify the chip number (LZM1UR1 / LZM2UR1A / LZM2UR1B / LZM2UR1C) before ordering. Non-returnable; 1-year 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.