⚙️ HydroQuip® ECO-2+2 Replacement Circuit Board — 33-0024D-K — CS6220 / CS9220 / CS4220 Series

Genuine HydroQuip® ECO-2+2 replacement PCB manufactured by Gecko — for HydroQuip CS and ES 4220, 6220, 6229, and 9220 Series spa control systems.

⚠️ IMPORTANT — PLEASE READ BEFORE ORDERING

• This is the ECO-2+2 — NOT the ECO-2. The ECO-2+2 (33-0024D-K) is specifically for CS/ES 6220 and 9220 Series systems. It is not the same as the ECO-2 (33-0024-R6, for CS6200/9200 series). These boards are not interchangeable — confirm your system model number before ordering.
• The ECO-2+2 supports two dual-speed pumps. This is the key functional distinction from the standard ECO-2, which supports a single primary pump. If your system runs two 2-speed pumps, you need the 33-0024D-K, not the 33-0024-R6.
• Connector type: JST Cable. This board uses a JST cable connection — confirm your system uses JST connectors before ordering.
• If replacing a 33-0024-U board: chip number verification is mandatory. The 33-0024-U is listed as a cross-reference with a required chip number check. Do not assume this board is a direct drop-in for a 33-0024-U without confirming the chip number matches.
• Temperature and hi-limit sensors sold separately. This board does not include sensors.
• Non-returnable. Circuit boards cannot be resold once purchased. Confirm compatibility before ordering. Damage from incorrect installation is not covered under warranty.

🔌 Product Overview

The HydroQuip® ECO-2+2 circuit board (part number 33-0024D-K, current revision 33-0024D-R3) is the replacement PCB for HydroQuip CS and ES 4220, 6220, 6229, and 9220 Series spa control systems. The board is manufactured for HydroQuip by Gecko, carries chip number 370, and uses a JST cable connector system.

The ECO-2+2 platform is a step up from the ECO-2. Where the ECO-2 supports a single primary pump, the ECO-2+2 supports two dual-speed pumps, making it the correct board for 6220 and 9220 Series systems that run two independently controlled 2-speed jet pumps. Sensors are not included and must be ordered separately.

🌟 Key Features

✅ Genuine HydroQuip® OEM replacement PCB — manufactured by Gecko for HydroQuip ECO-2+2 Series
✅ Part Numbers: 33-0024D-K (original kit) / 33-0024D-R3 (current revision)
✅ Chip Number: 370
✅ Two dual-speed pump outputs — the defining feature of the ECO-2+2 platform
✅ Supports CS/ES 4220, 6220, 6229, and 9220 Series systems
✅ JST cable connector
✅ 115V/120V operation — standard US residential voltage
✅ Factory-new — never installed
✅ 1-year limited manufacturer’s warranty

⚠️ Do NOT order this board for CS6200/9200 series systems — those systems use the ECO-2 (33-0024-R6), not the ECO-2+2.

⚠️ Temperature and hi-limit sensors sold separately.

🔩 Technical Specifications

Specification	Value
Part Number	33-0024D-K (original); 33-0024D-R3 (current revision)
Chip Number	370
Board Series	HydroQuip ECO-2+2 Digital
Manufacturer	Gecko (manufactured for HydroQuip)
Compatible Systems	HydroQuip CS/ES 4220, 6220, 6229, 9220 Series
Voltage	115V / 120V (60Hz)
Pump 1	2-Speed (dual speed)
Pump 2	2-Speed (dual speed)
Connector Type	JST Cable
Sensors Included	No — temperature and hi-limit sensors sold separately
Board Type	New (factory replacement)
Warranty	1-year limited manufacturer’s warranty
Returns	Non-returnable

🔗 Compatibility Guide

Compatible HydroQuip Control Systems:

System	Series
CS4220	ECO-2+2 / 4220 Series
CS6220	ECO-2+2 / 6220 Series
CS6229	ECO-2+2 / 6220 Series
CS9220	ECO-2+2 / 9220 Series
ES4220	ECO-2+2 / 4220 Series
ES6220	ECO-2+2 / 6220 Series
ES9220	ECO-2+2 / 9220 Series
Southwest Spas CS6230-U	Cross-compatible

⚠️ Not compatible with: CS6200/9200 (ECO-2 — requires 33-0024-R6) | CS6230/9230 (ECO-3 — requires 33-0024B-R4) | CS6330/9330 (ECO-3+2 — requires 33-0024E-K)

Replaces These Part Numbers:

Part Number	Notes
33-0024D-K	Original ECO-2+2 board
33-0024D-R1	Earlier revision
33-0024D-R2	Earlier revision
33-0024D-R3	Current revision (same product)
3-60-0151	Cross-reference
9203-003	Cross-reference
33-0024-U	⚠️ Chip number MUST be verified before ordering

⚠️ 33-0024-U replacement requires chip number verification. Do not assume direct compatibility — boards that look identical may be programmed differently.

Compatible Topside Panels:

Part Number	Description
34-0208	HydroQuip ECO-2+2 Topside
34-0200	HydroQuip Topside (cross-compatible)
34-0198A	HydroQuip Topside (cross-compatible)

Compatible Sensors (sold separately):

Part Number	Description
34-0203D	Temp Sensor — for ECO-2+2 systems
34-0201D	Hi-Limit Sensor — for ECO-2+2 systems
59-355-1025	Sensor, Hi Limit, HydroQuip, 18″, 1/4″ dia, 2-pin, After 5/03
59-355-1020	Sensor, Temp, HydroQuip, 10ft, 3/8″ dia, 4-pin, After 5/03

Recommended Accessories:

Part Number	Description
58-355-4025	Overlay, HydroQuip Eco 8, Pump 1, Light, Aux, Large Rec
60-155-1005	Surge Protector, Intermatic, 115V/230V

🎛️ ECO-2+2 vs ECO-2 — Key Difference

The ECO-2+2 and ECO-2 look similar but serve different systems. Confirm which one your spa needs before ordering.

Feature	ECO-2 (33-0024-R6)	ECO-2+2 (33-0024D-K)
Systems	CS6200 / CS9200	CS6220 / CS9220
Pump 1	1-Speed	2-Speed (dual speed)
Pump 2	Aux output only	2-Speed (dual speed)
Connector	JST Cable	JST Cable
Voltage	115V/120V	115V/120V
Chip	—	370

🛠️ Installation Requirements

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

Pre-Installation Checklist:

• [ ] Confirm system model is CS/ES 4220, 6220, 6229, or 9220 — NOT CS6200/9200
• [ ] Confirm both jet pumps are 2-speed (dual speed)
• [ ] Confirm existing board chip number if replacing 33-0024D-K, R1, R2, or R3
• [ ] If replacing a 33-0024-U: verify chip number first — mandatory
• [ ] Confirm JST cable connector on existing system
• [ ] Confirm voltage is 115V/120V
• [ ] Order temperature and hi-limit sensors separately if needed
• [ ] Disconnect all power at GFCI breaker or service disconnect
• [ ] Photograph all wiring before removal

Electrical Requirements:

Requirement	Specification
Supply Voltage	115V / 120V / 60Hz
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
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
• ⚠️ 115V/120V only — do not install in 240V systems
• ⚠️ Do NOT install in ECO-2 (CS6200/9200) systems — different board required
• ⚠️ 33-0024-U replacement requires chip number verification — mandatory before ordering
• ⚠️ Sensors not included — do not operate without correctly installed temperature and hi-limit sensors
• ⚠️ Damage from incorrect installation is NOT covered under warranty
• ⚠️ Non-returnable — verify compatibility before ordering

❓ Frequently Asked Questions

Q: How is the ECO-2+2 different from the ECO-2? A: The ECO-2+2 supports two dual-speed (2-speed) pumps. The ECO-2 supports a single primary pump with an auxiliary output. They look similar but are programmed differently and are not interchangeable. The ECO-2+2 is used in CS/ES 6220 and 9220 Series systems; the ECO-2 is used in CS/ES 6200 and 9200 Series systems.

Q: Can I replace a 33-0024-U with this board? A: The 33-0024-U is listed as a possible cross-reference, but chip number verification is mandatory before ordering. Do not assume compatibility based on appearance — contact Parts4Tubs with your existing board’s chip number to confirm.

Q: What connector type does this board use? A: JST Cable. Confirm your existing system uses JST connectors before ordering.

Q: Are sensors included with this board? A: No. Temperature and hi-limit sensors must be ordered separately. Confirm the correct sensor part numbers for your system — the recommended sensors for current production ECO-2+2 systems are 34-0203D (temp) and 34-0201D (hi-limit). Contact Parts4Tubs to confirm the right sensors for your specific system.

Q: What topsides are compatible with this board? A: Confirmed compatible topside panels are 34-0208, 34-0200, and 34-0198A. Contact Parts4Tubs to confirm your existing topside is compatible before ordering.

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 HydroQuip® ECO-2+2 (33-0024D-K)

✅ Genuine HydroQuip® OEM PCB — manufactured by Gecko for 6220/9220 Series systems
✅ Two dual-speed pump outputs — the correct board for 2-pump 2-speed systems
✅ Replaces all earlier ECO-2+2 revisions — 33-0024D-K, R1, R2, and R3 all covered
✅ JST cable connector system — designed for ECO-2+2 control box wiring
✅ Factory-new — never installed
✅ 1-year limited manufacturer’s warranty

🤝 Why Buy from Parts4Tubs

✅ Fast US shipping
✅ Compatibility verification — we confirm system model, chip number, and connector type before you order
✅ Compatible sensors available (34-0203D temp / 34-0201D hi-limit)
✅ Compatible topside overlays available (58-355-4025)
✅ Competitive pricing

💫 Summary

The HydroQuip® ECO-2+2 circuit board (33-0024D-K / current revision 33-0024D-R3) is the 115V/120V JST-cable replacement PCB for HydroQuip CS and ES 4220, 6220, 6229, and 9220 Series spa control systems. Manufactured by Gecko for HydroQuip (chip 370), it supports two dual-speed pump outputs — the key functional difference from the single-pump ECO-2 board. Compatible topsides: 34-0208, 34-0200, 34-0198A. Temperature and hi-limit sensors sold separately. If replacing a 33-0024-U board, chip number verification is mandatory before ordering. Non-returnable; 1-year manufacturer’s warranty; damage from incorrect installation not covered.

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.