⚙️ Marquis® EL2000 Mach 2.1 Replacement Circuit Board — 600-6289 (MQ2KUR1A) — Balboa® 53579

Genuine Balboa®-manufactured circuit board for Marquis® spa control systems using the EL2000 Mach 2.1 platform — chip MQ2KUR1A, Molex style plug.

⚠️ IMPORTANT — PLEASE READ BEFORE ORDERING

• Measure your mounting holes before ordering. Boards 600-6289 and 600-6292 look identical and function identically, but have different mounting hole positions. Measure across the bottom of your existing board — left to right — before ordering: 600-6289 has holes at 1/4″, 4½”, and 10″. If your holes are at different locations, order 600-6292 instead.
• Chip number verification is mandatory. The chip number for this board is MQ2KUR1A. Locate the chip sticker near the center of your existing board and confirm the number before ordering.
• Metal control box systems only. This board is designed for Marquis spas with a metal control box enclosure. Do not install in plastic Balboa enclosures.
• This board is for Marquis spas through approximately 2006. If your spa is outside this production range, a different board may be required.
• Retrofit option available. If this board is unavailable or you are upgrading an aging system, the Gecko in.ye-5 is a confirmed retrofit replacement. The topside footprint is the same size. Contact Parts4Tubs for guidance.

📋 Product Overview

The Marquis® 600-6289 circuit board is the Balboa®-manufactured OEM replacement PCB for Marquis spa control systems using the EL2000 Mach 2.1 platform. The Balboa Water Group part number is 53579 (also 53679), and the board operates within the Balboa Elite Series (EL) control architecture, which uses Balboa’s patented M7® temperature and water flow sensing technology.

The EL2000 Mach 2.1 was used in Marquis spa production through approximately 2006, with 2005 model year spas being a common application. The board uses a Molex style plug connector and is mounted in a metal control box. It typically pairs with VL600 or VL701 topside panels.

🌟 Key Features

✅ Genuine Balboa®-manufactured OEM PCB — for Marquis® EL2000 Mach 2.1 systems
✅ Marquis Part Number: 600-6289
✅ Balboa Part Numbers: 53579 / 53679 | Control box number: 53578
✅ Chip Number: MQ2KUR1A
✅ EL2000 Mach 2.1 platform — Balboa Elite Series
✅ Molex style plug connector
✅ Balboa M7® technology — no pressure switch required
✅ Metal control box mounting
✅ Factory-new — never installed
✅ 1-year limited manufacturer’s warranty

⚠️ Measure mounting holes before ordering — 600-6289 and 600-6292 look identical but have different hole positions.

🔩 Technical Specifications

Specification	Value
Marquis Part Number	600-6289
Balboa Part Numbers	53579 / 53679
Control Box Number	53578
Chip Number	MQ2KUR1A
System	EL2000 Mach 2.1
Series	Balboa Elite Series (EL)
Technology	Balboa M7® — no pressure switch required
Connector	Molex Style Plug
Enclosure Type	Metal control box
Typical Topsides	VL600 or VL701
Typical Year	Marquis spas through approximately 2006
Board Type	New (factory original)
Warranty	1-year limited manufacturer’s warranty
Returns	Non-returnable

⚠️ For voltage, amperage, and heater specifications for your specific system, refer to the wiring diagram and rating label on your spa’s equipment compartment cover. Electrical specs vary by spa configuration and are not published independently for this board. Contact Parts4Tubs for details.

⚠️ Critical Mounting Hole Check — 600-6289 vs 600-6292

These two boards look identical and function identically but are NOT interchangeable — they have different mounting hole positions.

Board	Mounting Hole 1	Mounting Hole 2	Mounting Hole 3
600-6289 (this board)	¼” from left	4½” from left	10″ from left
600-6292	Different positions	Different positions	Different positions

To measure: Lay a tape measure across the bottom of your existing board from left to right. Measure the distance to each mounting hole. If the holes are at ¼”, 4½”, and 10″, you need 600-6289. If the holes are at different positions, you need 600-6292.

Both boards are typically mounted in a metal control box.

🔗 Compatibility Guide

Compatible Systems:

This board is for Marquis® spa control systems using the EL2000 Mach 2.1 control platform with a metal control box enclosure, up to approximately 2006 model year.

How to Confirm Your Board:

1. Locate the chip number on the white sticker near the center of your existing board — confirm it reads MQ2KUR1A or MQ2KUR1B
2. Measure the mounting holes across the bottom of the board — confirm they are at ¼”, 4½”, and 10″
3. Confirm the board uses a Molex style plug connector
4. Confirm the board is mounted in a metal control box

Replaces These Part / Chip Numbers:

Part / Chip Number	Notes
600-6289	Marquis PN — this board
53579	Balboa PN
53679	Balboa alternate PN
MQ2KUR1A	Chip — current revision
MQ2KUR1B	Earlier chip revision

Typical Compatible Topsides:

Panel	Notes
VL600	Balboa VL600 Series topside — commonly used with EL2000
VL701	Balboa VL701 Series topside — commonly used with EL2000

🔄 Upgrade / Retrofit Option

If this board is unavailable or you are looking to upgrade from the aging EL2000 Mach 2.1 platform, the Gecko in.ye-5 is a confirmed retrofit replacement for EL2000/EL2001 systems. The topside footprint is the same size as the original. Contact Parts4Tubs for guidance on whether a retrofit is appropriate for your spa.

🛠️ 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 on existing board is MQ2KUR1A or MQ2KUR1B
• [ ] Measure mounting holes — confirm at ¼”, 4½”, and 10″ (if not, order 600-6292)
• [ ] Confirm Molex style plug connector
• [ ] Confirm metal control box enclosure
• [ ] Refer to wiring diagram on equipment compartment cover for voltage/DIP switch settings
• [ ] 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 on spa
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
• ⚠️ Measure mounting holes before ordering — 600-6289 and 600-6292 are NOT interchangeable despite identical appearance
• ⚠️ Metal control box only — not for plastic Balboa enclosures
• ⚠️ Confirm chip number (MQ2KUR1A) before ordering
• ⚠️ DIP switch configuration required — refer to wiring diagram on equipment cover
• ⚠️ Damage from incorrect installation is NOT covered under warranty

❓ Frequently Asked Questions

Q: How is 600-6289 different from 600-6292? A: These two boards look identical and function identically, but they have different mounting hole positions. The 600-6289 has mounting holes at ¼”, 4½”, and 10″ from the left across the bottom. The 600-6292 has holes at different positions. Measure before ordering — installing the wrong board in the wrong enclosure will result in misalignment.

Q: How do I confirm the chip number? A: The chip number is on a white sticker placed on the logic chip near the center of your existing board. Look for “MQ2KUR1A” or “MQ2KUR1B.” If you cannot find the sticker or it has fallen off, contact Parts4Tubs with the board’s 5-digit Balboa number (53579 or 53679).

Q: What is the Gecko in.ye-5 retrofit option? A: If this board is unavailable or you want to upgrade from the older EL2000 Mach 2.1 platform, the Gecko in.ye-5 is a recommended retrofit replacement. The topside footprint is the same physical size as the original, making it a practical upgrade path for aging EL2000 systems.

Q: Does this board use a pressure switch? A: No. The EL2000 platform uses Balboa’s M7® technology which integrates temperature and water flow sensing directly, eliminating the need for a separate pressure switch.

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

📑 Downloads & Resources

Download Product Manual

✅ Why Choose the Marquis® 600-6289 (Balboa® 53579)

✅ Genuine Balboa®-manufactured OEM PCB — for Marquis EL2000 Mach 2.1 systems
✅ Chip MQ2KUR1A — correct for Marquis EL2000 Mach 2.1 platforms
✅ Molex connector — direct match for EL2000 control box wiring
✅ Balboa M7® technology — no pressure switch required
✅ Factory-new — never installed
✅ 1-year limited manufacturer’s warranty

🤝 Why Buy from Parts4Tubs

✅ Fast US shipping
✅ Mounting hole and chip verification support — contact us before ordering if unsure
✅ Gecko in.ye-5 retrofit guidance available for EL2000 upgrades
✅ Competitive pricing

💡 Summary

The Marquis® 600-6289 circuit board (Balboa® 53579/53679, chip MQ2KUR1A) is the OEM replacement PCB for Marquis spa control systems using the EL2000 Mach 2.1 platform with a Molex style plug and metal control box. This board uses Balboa’s M7® technology and requires no pressure switch. Before ordering, measure the mounting holes across the bottom of your existing board — they must be at ¼”, 4½”, and 10″ for this board (600-6292 is identical in function but has different hole positions). Typically paired with VL600 or VL701 topside panels. A Gecko in.ye-5 retrofit is available if this board is unavailable or for system upgrades. 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.