💡 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

• QSC
• Start_Up_Guide
• Troubleshooting_Guide
• Tech-Book
• Flyer

🏆 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.