🎛️ Marquis® Signature / E-Series / Vector Replacement Circuit Board — 600-6315 (MQBP20UX-BS)

Genuine Marquis® MP20 circuit board by Balboa Water Group — for all 2013–2019 Signature Series, 2015–2019 2-Pump E-Series, and 2015–2019 Vector Spas with MicroSilk®.

⚠️ IMPORTANT — PLEASE READ BEFORE ORDERING

• Specialty board — spaparts.com explicitly categorizes this as a specialty circuit board. Compatibility must be confirmed against your spa model and year before ordering. Contact Parts4Tubs if uncertain.
• Setup configuration is required after installation. From April 2018 onward, all domestic Marquis spas shipped with circuit board 600-6314 using Setup 2. The 600-6315 replacement board can be configured for either setup to match your specific spa. Refer to the board setup instructions (available from Marquis) before installing.
• Chip number verification. Locate the chip sticker near the center of your existing board. The chip number for this board is MQBP20UXR3B. If your board shows MQBP20UX-BS R2A, that is the earlier chip revision this board replaces.

📋 Product Overview

The Marquis® 600-6315 circuit board (also MRQ600-6315) is the current OEM replacement PCB for Marquis Signature Series, E-Series, and Vector spa models manufactured from approximately 2013 through 2019. It is manufactured by Balboa Water Group under Balboa part number 59199 and uses the MQBP20UX-BS board designation (MP20 platform).

This board replaces both the discontinued 600-6307 and the discontinued 600-6314 circuit boards. Following April 2018, Marquis standardized all domestic spa production to use the 600-6314 board with Setup 2. The current 600-6315 replacement board supports multiple setup configurations, which must be correctly set to match the specific spa model receiving the board.

✨ Key Features

✅ Genuine Marquis® OEM circuit board — manufactured by Balboa Water Group
✅ Part Number: 600-6315 (also: MRQ600-6315)
✅ Balboa Part Number: 59199
✅ Chip Number: MQBP20UXR3B
✅ For Marquis Signature Series 2013–2019
✅ For Marquis 2-Pump E-Series 2015–2019
✅ For Marquis Vector Spas with MicroSilk® 2015–2019
✅ Replaces discontinued 600-6307 and 600-6314
✅ Configurable setup — matches pre-April 2018 and post-April 2018 spa configurations
✅ Factory-new — never installed
✅ 1-year limited manufacturer’s warranty

⚙️ Technical Specifications

Specification	Value
Marquis Part Number	600-6315 (also: MRQ600-6315)
Balboa Part Number	59199
Board Designation	BP20-MQBP20UX-BS (MP20 platform)
Chip Number	MQBP20UXR3B (current)
Replaced Chip	MQBP20UX-BS R2A (older revision, replaced by this board)
Board Type	New — factory original
Specialty Board	Yes — confirm compatibility before ordering
Warranty	1-year limited manufacturer’s warranty
Returns	Non-returnable

⚠️ For voltage, amperage, heater output, and pump configuration details for your specific spa, refer to the wiring diagram and rating label on your spa’s equipment compartment cover. Refer to the board setup instructions document for your specific spa model.

🔗 Compatibility Guide

Compatible Marquis® Spa Series and Years:

Spa Series	Model Years	Notes
Signature Series	2013–2019	All models
E-Series (2-Pump)	2015–2019	2-pump models only
Vector Series with MicroSilk®	2015–2019	All Vector/MicroSilk® models

⚠️ E-Series: Only 2-pump E-Series models are covered by this board. Single-pump E-Series models use a different board. Confirm pump count before ordering.

⚠️ Year confirmation required. This board covers the ranges above. If your spa is outside these ranges, a different board is required. Confirm your spa’s model and year from the nameplate or equipment label before ordering.

Replaces These Part Numbers:

Part Number	Status
600-6307	Discontinued — replaced by 600-6315
600-6314	Discontinued — replaced by 600-6315
MRQ600-6307	Discontinued (Marquis PN variant)
MRQ600-6314	Discontinued (Marquis PN variant)
MQBP20UX-BS R2A	Earlier chip revision — replaced by MQBP20UXR3B

ℹ️ Setup Configuration — Important Note

From April 2018, Marquis transitioned all domestic spa production to a single circuit board (600-6314) using Setup 2. Spas manufactured before April 2018 may use a different setup configuration.

The 600-6315 replacement board is configurable and can be set to match your spa’s original setup. Setup selection must be performed during installation. Detailed setup instructions are available from Marquis; contact Parts4Tubs for assistance accessing them.

If your spa was manufactured before April 2018: Confirm which setup your existing board uses before replacing. The setup must be matched correctly or your spa will not function as intended.

🛠️ Installation Requirements

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

Pre-Installation Checklist:

• [ ] Confirm spa model and year are within supported ranges
• [ ] For E-Series: confirm spa is a 2-pump model
• [ ] Confirm existing board chip number (should be MQBP20UX-BS R2A or a variant)
• [ ] Obtain board setup instructions from Marquis before starting installation
• [ ] Confirm correct setup for your spa model year
• [ ] Photograph all wiring and DIP switch/setup 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
• ⚠️ Specialty board — confirm compatibility before ordering
• ⚠️ Setup configuration required — incorrect setup will cause the spa to malfunction
• ⚠️ E-Series: 2-pump models only — single-pump E-Series uses a different board
• ⚠️ Damage from incorrect installation is NOT covered under warranty

❓ Frequently Asked Questions

Q: Which Marquis spas does this board cover? A: All Signature Series spas from 2013 through 2019; all 2-pump E-Series spas from 2015 through 2019; and all Vector spas with MicroSilk® from 2015 through 2019. Confirm your spa’s model, year, and pump configuration before ordering.

Q: What does “specialty board” mean? A: This board is designated a specialty item by the supplier, meaning it is specific to Marquis spa production and not a general-use circuit board. Compatibility is model- and year-specific. If uncertain, contact Parts4Tubs with your spa’s model and year to verify before ordering.

Q: What is the setup configuration requirement? A: From April 2018, all Marquis domestic spas were standardized to 600-6314 using Setup 2. Spas made before April 2018 may use Setup 1. When installing the 600-6315 board, the setup must be configured to match your spa’s original configuration. Refer to the board setup instructions document available from Marquis.

Q: My board shows 600-6307 — is the 600-6315 a direct replacement? A: Yes. The 600-6315 directly replaces the discontinued 600-6307. However, verify your spa’s model, year, and pump count against the compatibility list above, and obtain setup instructions to ensure correct configuration.

Q: What chip should my existing board have? A: If your existing board is a 600-6314 or 600-6307, the chip is likely MQBP20UX-BS R2A. The 600-6315 uses the updated MQBP20UXR3B chip and replaces these older boards.

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

✅ Why Choose the Marquis® 600-6315

✅ Genuine Marquis® OEM PCB — manufactured by Balboa Water Group
✅ Covers the widest supported range — replaces discontinued 600-6307 and 600-6314
✅ Updated MQBP20UXR3B chip — current revision
✅ Configurable setup — compatible with pre- and post-April 2018 spa configurations
✅ Factory-new — never installed
✅ 1-year limited manufacturer’s warranty

🤝 Why Buy from Parts4Tubs

✅ Fast US shipping
✅ Compatibility and setup verification support — contact us before ordering if unsure
✅ Competitive pricing

⚡ Summary

The Marquis® 600-6315 (MRQ600-6315) is the current OEM replacement circuit board for all Signature Series spas 2013–2019, all 2-pump E-Series spas 2015–2019, and all Vector spas with MicroSilk® 2015–2019. Manufactured by Balboa Water Group (Balboa PN 59199), it uses the MQBP20UXR3B chip and replaces the discontinued 600-6307 and 600-6314 boards. This is a specialty board — confirm compatibility before ordering. Setup configuration is required after installation: spas from before April 2018 may need a different setup than the post-April 2018 Setup 2 standard. 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.