⚙️ Balboa X-B Blower Expander Board Kit — 53310 (VS / EL2001 Systems)

The genuine Balboa X-B expander board kit for adding blower control to EL2001 Mach 2 & 3 and VS-series spa systems — includes 10A fuse and cables

📋 Product Overview

The Balboa X-B Expander Board (53310) is the genuine Balboa Water Group auxiliary relay circuit board kit for adding a dedicated blower output to EL2001 and VS-series spa control systems. Designated “X-B” (Extension-Blower) in Balboa’s documentation, this expander provides an additional relay circuit that allows a 1-speed air blower to operate independently alongside a 2-speed Pump 2 — a configuration not possible from the main EL2001 board alone without this board installed.

This is not a main replacement PCB. It is a daughter/expander board that plugs into the EL2001 or compatible VS main board’s dedicated X-B expansion header and is required any time a blower circuit needs to coexist with a fully-configured 2-speed Pump 2. The 53310 kit comes complete with the expander board, a 10-amp 250V fuse, and all necessary interconnect cables.

This board is required in your spa if:

• Your EL2001 Mach 2 or Mach 3 main board controls a 2-speed Pump 2, and you also need to run an air blower
• The original X-B blower expander board on your system has failed or is missing
• You are adding a blower circuit to an existing EL2001 or compatible VS-series control system

Compatible with EL2001 Mach 2 and Mach 3 main boards, and referenced in Balboa’s VS-series tech sheets (VS504SZ and related) as the correct expander to use when adding a blower to VS-series systems.

✨ Key Features

✅ Genuine Balboa X-B (Extension-Blower) Expander — Identified as “X-B · PN 53310 · Blower” directly on the EL2001 Mach 3 wiring diagram; factory OEM part for EL2001 and VS-series blower expansion

✅ Enables Blower + 2-Speed Pump 2 Simultaneously — Required when a 2-speed Pump 2 is active on an EL2001 system and a blower circuit is also needed; the main board’s J14 relay cannot serve both functions simultaneously

✅ Complete Kit — Board + Fuse + Cables Included — Comes with the expander PCB, a 10A 250V fuse, and all required interconnect cables; everything needed for installation in a single package

✅ Compatible with EL2001 Mach 2 and Mach 3 — Works with both Mach 2 and Mach 3 generations of the EL2001 main board (base PCBA 53974-05 and earlier EL2001 Mach 2 boards)

✅ Compatible with VS-Series Systems — Referenced in Balboa VS-series documentation (including VS504SZ and related systems) as the correct board to use for blower expansion alongside VS main boards

✅ Molex Connector Interface — Connects to the main EL2001 board via Balboa’s standard Molex-style connectors at J2, J3, and J6 expansion headers

✅ 10A Fuse Protection — On-board 10A 250V fuse provides dedicated overcurrent protection for the blower relay circuit

✅ Simple DIP Switch Activation — Blower is enabled on the EL2001 main board by setting DIP switch B3 to ON; Persistent Memory (A12) must then be reset for the change to take effect

🔧 Technical Specifications

Specification	Value
Part Number	53310
Board Designation	X-B (Extension-Blower)
Board Type	Expander / Daughter Board — NOT a main control PCB
Function	Adds 1-speed blower relay output to EL2001 and VS-series main boards
Connector Type	Molex-style connectors (J2, J3, J6 on main board)
Kit Contents	Expander board + 10A 250V fuse + interconnect cables
On-Board Fuse	10A 250V (included in kit)
Compatible Main Boards	Balboa EL2001 Mach 2, EL2001 Mach 3 (base PCBA 53974-05 / PCB PN 22896 Rev B); Balboa VS-series (VS504SZ and compatible)
Blower Output	1-speed, 240V (matches main system line voltage)
Activation DIP Switch	B3 ON on main EL2001 board = Blower enabled via this expander
Persistent Memory Reset	Required after B3 DIP change (set A12 ON during power-up on main board)
Certifications	Please refer to manufacturer documentation or contact Parts4Tubs
Warranty	Manufacturer’s warranty — contact Parts4Tubs for current terms
Physical Dimensions	Please refer to manufacturer documentation or contact Parts4Tubs

⚠️ This is an expander/daughter board, not a standalone control board. It cannot operate independently — it must be used with a compatible Balboa EL2001 or VS-series main board.

🔗 Compatibility Guide

Compatible Main Control Systems

System	Main Board PN	Notes
Balboa EL2001 Mach 3	53974-05 (base PCBA); PCB PN 22896 Rev B	PDF-confirmed: “X-B · PN 53310 · Blower” on Mach 3 wiring diagram
Balboa EL2001 Mach 2 / Mach 2.1	53414 (and earlier Mach 2 variants)	WEB-VERIFIED: “EL2001 Mach 2 & 3 Controllers” per kit description
Balboa VS-Series (VS504SZ and related)	54638 and compatible VS-series PCBs	PDF reference: “When using a Blower, use X-B expander board” in VS504SZ tech sheet

⚠️ Confirm your main board supports the X-B expansion header before ordering. Not all Balboa systems use the X-B expander. Contact Parts4Tubs with your main board part number if unsure.

When Is This Board Required?

Scenario	X-B Board 53310 Required?
EL2001 with 2-speed P1 + 2-speed P2 + Blower	✅ Yes — expander required for blower alongside 2-speed P2
EL2001 with 2-speed P1 + Blower only (no P2)	⚠️ Verify — may not require expander; check main board DIP config
VS-series with Blower	✅ Yes — X-B board referenced in VS tech sheets for blower expansion
EL2001 with 1-speed Pump 3 (not a blower)	❌ Use X-P expander instead (e.g., 53544), not the X-B
EL8000 or BP-series systems	❌ Different expander systems — X-B 53310 is not for these platforms

ℹ️ X-B vs. X-P: The X-B (53310) is specifically for blower expansion. For adding a 1-speed pump output (Pump 3), use the X-P series expander instead (e.g., 53544 for EL2001 or the X-P332/59097 for BP-series). Do not substitute one for the other.

Related Balboa Expander Boards

PN	Board Name	Function
53310 (this board)	X-B — Blower Expander	Adds 1-speed blower to EL2001 / VS systems
53544	X-P — 1-Speed Pump Expander	Adds 1-speed Pump 3 to EL2001 systems
53680	X-P632 — 2-Speed Pump Expander	Adds 2-speed Pump 3 to EL2000/EL2001 (2 relays, 30A fuse)
55137 / G1920	EXT VS 2-Relay	Adds 2-speed pump output for VS520SZ/BP7/BP501 systems
53681 / G1910	X-P231 — 1-Speed High-Amp	Adds 1-speed pump to EL2001/BP systems (30A fuse)

🎛️ Board Functions & Installation Notes

What the X-B Board Does

The X-B expander board installs on the EL2001 main PCB and provides a dedicated single-speed relay output for an air blower. On the EL2001 Mach 3 system (Setup 1 as manufactured), the full output configuration with this expander installed is:

Output	Specification
Pump 1	240V, 2-speed
Pump 2	240V, 2-speed
Blower (via X-B / 53310)	240V, 1-speed
Spa Light	240V (or 12V via J37 jumper)
Ozone	120V (configurable)
A.V. / Stereo	12V
Heater	5.5 kW (240V)
Circ Pump	120V (optional)

DIP Switch Configuration for Blower

After installing the X-B expander board, the following settings must be applied on the EL2001 main board:

Switch	Setting	Function
B3	ON	Blower enabled — activates blower relay via X-B expander
B2	ON	Pump 2 enabled (required if using 2-speed P2 simultaneously)
B1	OFF	Pump 2 set to 2-speed (B1 OFF = 2-speed P2)
A12	ON (during power-up only)	Reset Persistent Memory to apply new DIP settings

⚠️ CRITICAL: After changing DIP switch B3 to ON, you must reset Persistent Memory (A12) for the blower to function correctly. Failure to reset Persistent Memory will cause the system to behave as if the old DIP settings are still in effect.

Persistent Memory Reset Procedure (EL2001):

1. Power down the spa completely
2. Set A12 to the ON position
3. Power up and wait for ” ” or ” ” to display on the panel
4. Set A12 back to OFF (can be done with power on using a non-conductive tool such as a pencil)
5. Power up again if you powered down in the previous step

⚙️ Installation Requirements

⚠️ IMPORTANT: All electrical work on hot tub control systems must be performed by a licensed electrician in compliance with the National Electrical Code (NEC) Article 680 and all applicable local codes.

Pre-Installation Checklist

• [ ] Confirm your main board is an EL2001 Mach 2/3 or compatible VS-series board
• [ ] Confirm you need a blower output (not a 1-speed pump — those use X-P expanders)
• [ ] Disconnect ALL power at circuit breaker and GFCI before starting
• [ ] Identify the X-B expansion header on your main EL2001 board (connectors J2/J3/J6)
• [ ] Have the 10A 250V replacement fuse ready (included in kit)
• [ ] Review the EL2001 Mach 3 tech sheet for wiring diagram before installing

Electrical Requirements (EL2001 Main System)

Requirement	Specification
Main System Input	240VAC, 60Hz
Service Circuit Breaker	60A maximum (Class A GFCI protected)
GFCI Protection	Class A GFCI required — NEC Article 680
Ground Connection	Equipment grounding and bonding — NEC Article 680
Dedicated Circuit	Required
Disconnect Box	Required within line of sight of spa (NEC)

💡 Tip: After installation, reset Persistent Memory (A12 ON during power-up) to register the new blower DIP switch setting. Verify blower operation before closing the control box.

---

⚠️ Safety Warnings

• ⚠️ ALWAYS disconnect ALL power at the circuit breaker and GFCI before any work inside the control box
• ⚠️ Installation MUST be performed by a licensed electrician only
• ⚠️ This is an expander daughter board — it adds a relay output to a compatible main board; it cannot be wired as a standalone device
• ⚠️ After installing and enabling via DIP B3, Persistent Memory (A12) MUST be reset — failure to do so can cause abnormal system behavior including incorrect pump/blower operation
• ⚠️ The 10A fuse on this board protects the blower relay circuit only — do not substitute a higher-rated fuse
• ⚠️ Do not use this X-B board to connect a pump — it is rated and designed for blower loads only

---

🔍 Troubleshooting

Symptom After Installation	Check First
Blower not operating after B3 set to ON	Persistent Memory (A12) not reset — repeat the reset procedure
Configuration error on panel display	DIP switch conflict — verify B3, B2, B5 settings are consistent
Fuse blown on X-B board	Blower may be drawing excess current; verify blower motor specs and wiring
Blower runs but pumps behave incorrectly	DIP B1/B2 settings; verify P2 1-speed vs 2-speed selection matches installed pump

❓ Frequently Asked Questions

Q: Is the 53310 a replacement for my main EL2001 circuit board? A: No. The 53310 is an expander/daughter board — it adds a blower relay output to your existing EL2001 or VS-series main board. If your main board has failed, you need a replacement main PCB (such as 53974-05 for EL2001 Mach 3) in addition to, or instead of, this board.

Q: My EL2001 system already has a blower but it’s not working — do I need a new 53310? A: First check whether the 10A fuse on the existing X-B board has blown — this is the most common failure. Also check the blower motor itself and the wiring connections. If the fuse is intact and the blower motor is good, the expander board relay may have failed.

Q: Can I use this board to add a Pump 3 instead of a blower? A: No. The X-B (53310) is designed for blower loads. For a 1-speed Pump 3, use the X-P expander (53544) for EL2001 systems. The DIP switch designations and wiring are different — they are not interchangeable.

Q: Does this board work with the EL8000 or BP-series systems? A: No. The 53310 X-B expander is specific to EL2001 (Mach 2 and 3) and VS-series systems. The EL8000 uses the 53680 (X-P632) expander for additional outputs, and BP-series systems use the X-P332 (59097) and X-P231 (G1910) expanders.

Q: What DIP switch do I need to set to activate the blower? A: On the EL2001 main board, set DIP switch B3 to ON to enable the blower. After this change, you must reset Persistent Memory by setting A12 to ON during a power-up cycle, then setting it back to OFF. See the Installation section above for the full procedure.

Q: The kit says it includes cables — do I need additional wiring? A: The 53310 kit includes the cables needed to connect the expander to the main board’s J2/J3/J6 headers. The blower itself is wired directly to the expander board’s output relay. No additional Balboa proprietary cables should be needed for a standard installation.

Q: Is installation of this board considered electrical work requiring a licensed electrician? A: Yes. Any work inside a hot tub electrical enclosure, including installing or replacing expander boards, is covered by NEC Article 680 requirements and must be performed by a licensed electrician in most US jurisdictions.

🏆 Why Choose the Genuine Balboa X-B Expander (53310)?

✅ Factory OEM Balboa Part — Designated X-B PN 53310 directly on the official EL2001 Mach 3 wiring diagram; the correct factory-specified board for blower expansion on this platform

✅ Complete Kit — Includes expander board, 10A 250V fuse, and interconnect cables; no additional components needed for standard installation

✅ Dual-Generation Compatibility — Works with both EL2001 Mach 2 and Mach 3 main boards, as well as VS-series systems

✅ Enables Three-Device Configuration — Allows simultaneous operation of 2-speed P1, 2-speed P2, and blower — the full standard EL2001 Setup 1 configuration

✅ Correct Protection Rating — 10A fuse matched to blower circuit requirements; appropriate for 1-speed blower loads on EL2001 systems

✅ Parts4Tubs Expert Support — Our team can confirm compatibility with your specific EL2001 or VS-series system before you order

🤝 Why Buy From Parts4Tubs?

✅ Fast US shipping
✅ Expert guidance on EL2001 system configuration, DIP settings, and expander board selection
✅ Full EL2001 ecosystem: main boards (53974-05), expanders (53310, 53544, 53680), panels (ML400, ML700, ML900), and sensors available
✅ Competitive pricing on genuine Balboa OEM parts
✅ Help identifying correct expander board for your specific system

⚡ Summary

The Balboa X-B Expander Board Kit (53310) is the genuine OEM daughter board for adding a 1-speed blower circuit to Balboa EL2001 Mach 2 and 3, and VS-series spa control systems. Designated X-B in official Balboa documentation, the complete kit includes the expander PCB, a 10A 250V fuse, and all cables needed for installation. It is required when a 2-speed Pump 2 and an air blower need to operate simultaneously on an EL2001-based system. After installation, DIP switch B3 on the main board must be set to ON and Persistent Memory (A12) reset for the blower to function. This is an expander board, not a main PCB replacement — for EL2001 main board replacement, see part 53974-05.

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.