💡 Gecko IN.YJ-3-V3 Control Box Only – Compact Spa Controller for Small Footprint Spas
Small package, zero compromise – the ideal control system for compact spa installations and heat recovery applications.
⚡ Product Overview
The Gecko IN.YJ-3-V3 Control Box is the compact powerhouse of the Y Series, designed specifically for smaller spas where space is at a premium but performance cannot be compromised. This third-generation controller features an upgraded CPU, expanded memory, and higher-capacity relays, delivering robust functionality in a remarkably compact enclosure.
With three configurable outputs supporting dual-speed pumps, single-speed pumps, blowers, and ozone generators, the IN.YJ-3-V3 offers flexible configuration options for entry-level to mid-range spa installations. The V3 generation introduces onboard diagnostic LEDs for rapid troubleshooting and in.mix 300 RGB colour system integration directly on the main board.
This control box is sold without a heater, making it ideal for heat recovery applications or installations where you need to pair it with a specific heat.wav heater (1.3kW to 4kW options available separately). The included flat aluminium mounting bracket provides flexible installation options, whilst the IPX5-rated watertight enclosure ensures reliable operation in demanding spa cabinet environments.
✨ Key Features
✅ Compact Design – Smallest Y Series controller at just 308mm x 186mm x 96mm, perfect for small footprint spas
✅ 3 Configurable Outputs – Supports dual-speed pump (uses 2 outputs), single-speed pump, blower, or ozone combinations
✅ V3 Upgraded CPU – Boosted processor with expanded memory and higher-capacity relays for enhanced performance
✅ Diagnostic LEDs – New onboard PCB LED indicators for quicker troubleshooting resolution
✅ 12V DC Light Output – 1A capacity with in.mix 300 RGB colour system integration on main board
✅ in.lu.me LED Support – Connect up to 51 in.lu.me LED modules for stunning colour effects
✅ Flexible Heater Options – Compatible with heat.wav heaters from 1.3kW to 4kW (sold separately)
✅ IPX5 Watertight Rating – in.seal protection for enclosure and connectors
✅ Wide Keypad Compatibility – Works with IN.K200, IN.K300, IN.K330, IN.K450, IN.K500, IN.K600, IN.K800, IN.K1000, IN.K1001
✅ in.touch Ready – WiFi remote control capability via smartphone or tablet
✅ Dual-Phase Support – CE model supports both single-phase and dual-phase electrical configurations
✅ Mounting Bracket Included – Flat aluminium bracket for versatile wall or cabinet installation
⚙️ Electrical Specifications
| Specification | Value |
|---|---|
| Input Voltage | 220-240V nominal (+5/-10%) |
| Frequency | 50-60 Hz |
| Maximum Amperage (Single-Phase) | 40A max |
| Maximum Amperage (Dual-Phase) | 20A max per phase |
| Configurable Outputs | 3 |
| Light Output | 12V DC, 1A maximum |
| RGB LED Output | 51 in.lu.me modules max (1A max combined) |
⚠️ Important: Total of Pump 1, O3, heater, and Direct output should not exceed 32A for CE/AS/NZS models.
Compatible Heater Options (Sold Separately)
| Heater Model | Power | Voltage | Part Number |
|---|---|---|---|
| heat.wav-YJ 1.3kW | 1.3kW | 220-240V | 0613-421004 |
| heat.wav-YJ 2kW | 2kW | 220-240V | 0613-421002 |
| heat.wav-YJ 3kW | 3kW | 220-240V | 0613-421003 |
| heat.wav-YJ 4kW | 4kW | 220-240V | 0613-421001 |
All heat.wav heaters feature in.flo integrated dry-fire protection, Incoloy element, and require minimum 18 GPM (68.1 LPM) flow rate.
🔌 Output & Connection Specifications
Pump and Accessory Outputs (European CE Model)
| Output | Voltage | Maximum Current | Typical Device |
|---|---|---|---|
| Pump 1 High Speed | 220-240V | 15 FLA / 60 LRA (inrush) | Main jet pump high |
| Pump 1 Low Speed | 220-240V | 15 FLA / 60 LRA (inrush) | Main jet pump low |
| Pump 2 | 220-240V | 15 FLA / 60 LRA (inrush) | Secondary pump (IN.YJ-3 only) |
| Ozone | 220-240V | 3 FLA / 6A | Ozone generator |
| Direct Output 1 | 220-240V | 5A | Always-on accessory |
| Light Output | 12V DC | 1A | Light/LED |
| RGB LEDs | 12V DC | 1A (combined with light) | in.lu.me modules |
⚠️ Note: The ozonator is connected in parallel with Pump 1 low speed, therefore they cannot be controlled independently.
Typical Pump Configurations
| Configuration | Outputs Used | Components |
|---|---|---|
| Config 1 | 3 outputs | 1x dual-speed pump + 1x single-speed pump |
| Config 2 | 3 outputs | 1x dual-speed pump + blower |
| Config 3 | 3 outputs | 3x single-speed pumps (with 24hr circ pump) |
| Config 4 | 3 outputs | 2x single-speed pumps + blower |
⚠️ Important: A dual-speed pump uses 2 relay outputs.
Connection Types
| Connection | Type | Notes |
|---|---|---|
| High Voltage Accessories | 0.25″ quick-connect terminals | Straight, non-insulated female terminals |
| Keypad Connection | in.link connector | Low-voltage, watertight |
| Light Socket | MTA connector to P33 | For standard light socket cable |
| in.lu.me RGB | JST 4-pin connector to P38 | For RGB LED cable |
| Heat.wav Low Voltage | JST connector to P1 | Probe connection |
| Plumbing Size | 2″ | Standard spa plumbing |
🔗 Compatibility
Compatible Topside Panels
| Panel Model | Compatible | Notes |
|---|---|---|
| IN.K200 | ✅ Yes | LED display, 4 keys |
| IN.K300 | ✅ Yes | LCD display, 4 keys |
| IN.K330 | ✅ Yes | Colour LCD display, 5 keys |
| IN.K450 | ✅ Yes | ACL display, 7 keys |
| IN.K500 | ✅ Yes | Colour LCD display, 7 keys |
| IN.K600 | ✅ Yes | LCD display, 11 keys (static) |
| IN.K800 | ✅ Yes | Colour LCD display, 10 keys |
| IN.K1000 / IN.K1000+ | ✅ Yes | Colour LCD capacitive touchscreen |
| IN.K1001 / IN.K1001+ | ✅ Yes | Colour LCD capacitive touchscreen |
| IN.K120 | ✅ Yes | Auxiliary keypad |
| K-19 | ✅ Yes | LED display, 4 keys (legacy) |
| K-35 | ✅ Yes | LED display, 6 keys (legacy) |
| K-8 | ✅ Yes | LCD display, 8 keys (legacy) |
Connectivity Options
| Feature | Supported | Notes |
|---|---|---|
| in.touch | ✅ Yes | WiFi remote control via iOS/Android |
| in.stik | ✅ Yes | Automated software upload |
| in.mix 300 | ✅ Yes | RGB colour system integrated on main board |
| in.lu.me | ✅ Yes | Up to 51 LED modules supported |
📐 Physical Specifications
| Specification | Value |
|---|---|
| Dimensions (L x W x H) | 308mm x 96mm x 186mm |
| Weight | 1.41kg (3.1 lb) |
| Enclosure Material | High-impact plastic |
| IP Rating | IPX5 (watertight) |
| Mounting Type | Wall mount with included flat aluminium bracket |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
| Storage Temperature | -25°C to 85°C (-13°F to 185°F) |
| Humidity Range | Up to 85% RH, non-condensing |
| Ambient Temperature Limit | 60°C maximum around controller |
Mounting Options
| Bracket Type | Part Number | Notes |
|---|---|---|
| Flat Aluminium Bracket | Included | 5 possible mounting positions |
| Wall Mount Bracket Kit | 9920-101474 | 100 pcs kit with screws |
| Z-Bracket Kit | 9920-101478 | For flush-mounting on access door frame |
🛡️ Safety Features
| Safety Feature | Specification |
|---|---|
| Watertight Protection | in.seal IPX5 rated enclosure and connectors |
| Dry-Fire Protection | in.flo electronic (when paired with heat.wav heater) |
| Temperature Algorithm | in.t.cip intelligent heating optimisation |
| RCD/GFCI Requirement | Must be connected to RCD not exceeding 30mA |
| Thermal Protection | Ambient temperature monitoring |
Certifications
| Certification | Status |
|---|---|
| CE Mark | ✅ Certified |
| IEC 60335-1:2010 | ✅ Compliant (with amendments) |
| IEC 60335-2-60:2017 | ✅ Compliant |
| AS/NZS 60335.1:2011 | ✅ Compliant (with amendments) |
| AS/NZS 60335.2.60:2006 | ✅ Compliant |
| EN 55014-1 (2017) | ✅ Compliant |
| EN 55014-2 (2015) | ✅ Compliant |
💻 Programming & Features
Control Features
- Adjustable temperature set point: 15°C to 40°C (59°F to 104°F)
- Factory default temperature: 35°C (95°F), maximum 38°C (100°F)
- Configurable filtration cycles
- Pump runtime programming
- Light timeout settings
- Celsius or Fahrenheit display option
Smart Features
| Feature | Description |
|---|---|
| in.t.cip Algorithm | Intelligent water temperature refresh optimising pump activation and heating cycles |
| Self-Diagnostics | Automatic error detection and display |
| Diagnostic LEDs | 13 onboard LEDs for troubleshooting |
| Firmware Updates | Wireless capability via in.stik |
| in.mix 300 Integration | Full RGB colour control from compatible keypads |
| IoT Connectivity | Pathway to connected accessories with faster communication |
🔧 Installation Requirements
Pre-Installation Checklist
- [ ] Electrical supply meets 220-240V, 50-60Hz requirements
- [ ] Appropriate RCD installed (30mA maximum)
- [ ] Control box positioned minimum 100mm (4″) above potential flood level
- [ ] Heat.wav heater selected (sold separately) or heat recovery system in place
Electrical Requirements
| Requirement | Specification |
|---|---|
| Supply Voltage | 220-240V nominal (+5/-10%) |
| Frequency | 50-60 Hz |
| RCD | Maximum 30mA residual current |
| Wire Gauge | Maximum 8 AWG (do not exceed) |
| Bonding | Copper conductor (minimum 8 AWG) to bonding lugs |
Wiring Configurations (European CE Model)
| Configuration | Requirements |
|---|---|
| Single-Phase | 1 line + neutral, 40A max |
| Dual-Phase | 2 lines + neutral, 20A max per phase |
⚠️ Important Notes:
- Refer to manufacturer wiring diagram in enclosure lid
- All electrical work must comply with BS 7671 (IET Wiring Regulations)
- Spa electrical installations in the UK require Part P certification
- Only copper wire should be used, never aluminium
- Use IEC certified plastic bushing to maintain IPX5 rating
🔍 Troubleshooting & Error Codes
Common Error Codes
| Code | Meaning | Possible Cause |
|---|---|---|
| HL | High Limit | Water temperature at heater reached 48°C (119°F). Do not enter spa water |
| OH | Overheat | Water temperature reached 42°C (108°F). Do not enter spa water |
| FLO | No Flow | No water flow detected while main pump running |
| Prr | Probe Error | Problem with regulation temperature probe |
| UPL | Upload Error | No low-level configuration software downloaded |
Diagnostic LED Indicators
The IN.YJ-3-V3 features 13 onboard diagnostic LEDs for rapid troubleshooting:
- Power LED – System power status
- FLO LED – Flow detection status
- Output LEDs – Individual relay status indicators
- Communication LED – Keypad/accessory connection status
⚠️ Always disconnect power before inspecting control box.
🎯 Ideal Applications
| Application | Suitability | Notes |
|---|---|---|
| 🏠 Small home hot tub | ✅ Excellent | Designed specifically for compact spas |
| 🏠 Plug-and-play spa | ✅ Excellent | Compact size ideal for portable spas |
| 🛁 Therapy tub | ✅ Excellent | Simple pump configurations supported |
| 🏢 Holiday let | ✅ Good | Remote monitoring via in.touch |
| 🔄 Heat recovery system | ✅ Excellent | Box-only option perfect for in.yj-re applications |
| 🔄 Replacement/Upgrade | ✅ Excellent | Like-for-like replacement for older IN.YJ systems |
❓ Frequently Asked Questions
Q: Does this include a heater? A: No, this is the control box only. Heat.wav heaters (1.3kW, 2kW, 3kW, or 4kW) are sold separately. This is ideal for heat recovery applications or when you need to specify a particular heater output.
Q: What’s the difference between IN.YJ-2 and IN.YJ-3? A: The number refers to configurable outputs. IN.YJ-2 has 2 outputs whilst IN.YJ-3 has 3 outputs, allowing for an additional pump or accessory.
Q: Can I use a dual-speed pump with this control box? A: Yes, but a dual-speed pump uses 2 of the 3 available outputs. This leaves 1 output for an additional single-speed pump, blower, or other accessory.
Q: What topside panels work with the IN.YJ-3-V3? A: The system is compatible with all Gecko IN.K series keypads including IN.K200, IN.K300, IN.K330, IN.K450, IN.K500, IN.K600, IN.K800, IN.K1000, and IN.K1001.
Q: Can I control my spa remotely? A: Yes, with the optional in.touch system (sold separately), you can monitor and control your spa via iOS or Android devices.
Q: What’s new in the V3 version? A: The V3 features a boosted CPU, expanded memory, higher-capacity relays, onboard diagnostic LEDs, in.mix 300 RGB integration on the main board, dual-phase CE support, and updated FLO circuit.
Q: Is the mounting bracket included? A: Yes, a flat aluminium mounting bracket is included for wall or cabinet installation.
📥 Downloads & Resources
🏆 Why Choose the Gecko IN.YJ-3-V3 Control Box
✅ Ultra-Compact Design – Smallest Y Series controller, perfect for space-constrained installations
✅ V3 Technology – Upgraded CPU, expanded memory, and diagnostic LEDs for superior performance and troubleshooting
✅ Flexible Heater Options – Choose from 1.3kW to 4kW heat.wav heaters to match your spa requirements
✅ in.mix 300 Integration – RGB colour system built into main board for stunning LED lighting effects
✅ Dual-Phase Support – CE model works with both single-phase and dual-phase electrical systems
✅ Comprehensive Keypad Compatibility – Works with full range of Gecko IN.K series keypads
🤝 Why Buy From Parts4Tubs
✅ UK-based company with local support
✅ Fast UK delivery
✅ Expert advice from spa specialists
✅ Competitive pricing
✅ Full warranty support
✅ Easy returns within 30 days
✅ Compatible heat.wav heaters and accessories available
✅ Technical support for installation queries
⭐ Summary
The Gecko IN.YJ-3-V3 Control Box Only delivers compact spa control with 3 configurable outputs in the smallest Y Series enclosure. This V3 generation features upgraded CPU, diagnostic LEDs, and in.mix 300 RGB colour system integration. Compatible with heat.wav heaters from 1.3kW to 4kW (sold separately), the system supports dual-speed pumps, single-speed pumps, blowers, and ozone generators. Operating on 220-240V at 50-60Hz with single or dual-phase configurations, the IPX5-rated controller works with all Gecko IN.K series keypads and supports in.touch remote connectivity. Includes flat aluminium mounting bracket. Ideal for small footprint spas, heat recovery applications, and like-for-like replacements.




