Inkbird C226T15A-US
INKBIRD Plug-in Thermostat User Manual
Model: C226T15A-US
Introduction
The INKBIRD Plug-in Thermostat is a versatile digital temperature controller designed for precise heating and cooling applications. It features programmable modes, a clear LCD display, and a waterproof probe, making it suitable for a wide range of uses including homebrewing, greenhouses, reptile terrariums, and more. This manual provides detailed instructions for setup, operation, and maintenance to ensure optimal performance and safety.
Safety Information
Please read all safety warnings and instructions carefully before using this product. Failure to follow these instructions may result in electric shock, fire, and/or serious injury.
- Ensure the power supply voltage matches the specifications of the thermostat (120 Vac, 15A).
- Do not immerse the main unit in water or expose it to excessive moisture. Only the temperature probe is waterproof (IP67).
- Do not exceed the maximum load capacity of 1800W.
- Keep out of reach of children. Utilize the child lock function to prevent accidental changes to settings.
- Unplug the device from the power outlet before cleaning or performing any maintenance.
- If the device appears damaged, do not use it. Contact customer support.

High/Low Temperature Alarm: The thermostat supports high and low temperature alarms with customizable values. The buzzer can be muted if desired. This feature enhances safety by alerting users to critical temperature deviations.
Product Overview
The INKBIRD Plug-in Thermostat is designed for ease of use and precise control. Familiarize yourself with its components and features.

Component Diagram: This image illustrates the key parts of the Inkbird thermostat, including the LCD screen, control buttons, power output, temperature probe, and various indicator icons. Dimensions are also shown for reference.
Key Features:
- Plug & Play Design: Simple to set up and use.
- Multiple Control Modes: Supports Temperature Mode, Cycle Time Mode, and Countdown Mode.
- Wide Temperature Range: Controls temperatures from -40°F to 212°F (-40°C to 100°C).
- High/Low Temperature Alarms: Customizable alarm values with an option to mute the buzzer.
- IP67 Waterproof Probe: Durable probe suitable for wet or dry environments.
- Backlit LCD Screen: Clear display for easy reading in various lighting conditions.
- Child Lock Function: Prevents accidental changes to settings.
- Memory Function: Retains all set parameters after a power failure.
- Temperature Calibration: Allows for fine-tuning of temperature readings.
- Refrigeration Delay: Protects compressors in cooling applications.

Product View: The main unit of the Inkbird thermostat, featuring its digital display, control buttons, and the attached temperature probe, highlighting its 1800W capacity.
Setup
Follow these steps for the initial setup of your INKBIRD Plug-in Thermostat.
- Unpack the Device: Carefully remove the thermostat and its accessories from the packaging.
- Connect the Temperature Probe: Insert the temperature probe into the designated port on the thermostat. Ensure it is securely connected.
- Plug into Power Outlet: Plug the thermostat directly into a standard 120V AC power outlet. The LCD screen will light up.
- Position the Probe: Place the temperature probe in the environment where you wish to monitor and control the temperature. For example, in water for aquariums, soil for plants, or air for rooms. The IP67 rating allows for submersion.
- Connect Appliance: Plug your heating or cooling appliance (e.g., heater, fan, refrigerator) into the power outlet on the front of the thermostat.

Practical Setup: The thermostat is shown plugged into a wall outlet, ready for use in a home environment, demonstrating its compact and practical design.
Operating Instructions
The thermostat offers three main control modes: Temperature Mode, Cycle Time Mode, and Countdown Mode. Use the MODE button to switch between them, and the SET button to confirm settings. Use the UP and DOWN arrows to adjust values.
1. Temperature Mode
This mode allows you to set a desired temperature range for heating or cooling.
- Press MODE until "Temperature Mode" is indicated on the display (usually by showing START and STOP temperatures).
- Press SET to enter setting mode. The "START" temperature will flash.
- Use UP/DOWN to adjust the desired start temperature. Press SET to confirm.
- The "STOP" temperature will flash. Use UP/DOWN to adjust the desired stop temperature. Press SET to confirm and exit setting mode.
Heating Mode: If START Temperature < STOP Temperature, the device will activate when the temperature drops to START and deactivate when it reaches STOP.
Cooling Mode: If START Temperature > STOP Temperature, the device will activate when the temperature rises to START and deactivate when it drops to STOP.

Cooling/Heating Operation: This image illustrates how the thermostat automatically switches between cooling and heating based on the set start and stop temperatures, covering a wide range from -40°F to 212°F.
2. Timing Functions (P01, P02, P03, P04)
The thermostat offers four timing modes for various applications. The timing range is 0 to 99 hours and 59 minutes.

Flexible Timing Functions: This image shows the four distinct timing modes (P01, P02, P03, P04) available on the Inkbird thermostat, each with its specific application for controlling connected devices based on time intervals.
- Press MODE to cycle through the timing modes (P01, P02, P03, P04).
- Once the desired timing mode is displayed, press SET to enter setting mode.
- Use UP/DOWN to adjust the time values (hours and minutes). Press SET to move to the next parameter or confirm.
- Press SET again to exit setting mode.
P01 Cycle Time Mode: The device will cycle ON and OFF repeatedly based on set ON and OFF durations.
P02 Countdown ON Mode: The device will turn ON after a set countdown period.
P03 Countdown OFF Mode: The device will turn OFF after a set countdown period.
P04 Countdown ON&OFF Mode: The device will turn ON for a set duration, then OFF for another set duration, and then stop.
Note: Temperature mode and timing functions cannot be used simultaneously.
Maintenance
Proper maintenance ensures the longevity and accuracy of your thermostat.
- Cleaning: Disconnect the thermostat from power before cleaning. Wipe the unit with a soft, damp cloth. Do not use abrasive cleaners or immerse the main unit in water.
- Probe Care: Regularly inspect the temperature probe for any signs of damage. Clean the probe as needed, especially if used in liquids or soil, to ensure accurate readings.
- Storage: If storing the device for an extended period, unplug it and keep it in a cool, dry place away from direct sunlight.

LCD Screen and Settings: The large backlit LCD screen provides clear temperature readings and access to advanced functions like temperature calibration and refrigeration delay, which are important for maintaining accuracy and protecting connected appliances.
Troubleshooting
If you encounter issues with your INKBIRD Plug-in Thermostat, refer to the following common problems and solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| Display is blank. | No power; device unplugged. | Ensure the thermostat is securely plugged into a live power outlet. Check the outlet with another device. |
| Temperature reading is inaccurate. | Probe not properly placed or damaged; calibration needed. | Ensure the probe is correctly positioned. Use the temperature calibration function to adjust the reading if necessary. Inspect the probe for damage. |
| Appliance not turning ON/OFF. | Incorrect settings; appliance issue; thermostat malfunction. | Verify your START/STOP temperatures or timing settings. Ensure the appliance plugged into the thermostat is working correctly. If issues persist, perform a factory reset. |
| Child lock is active. | Buttons are unresponsive. | Press and hold the UP and DOWN buttons simultaneously for 3 seconds to disable the child lock. |
| Buzzer alarm sounds frequently. | Temperature exceeds set alarm limits. | Adjust high/low temperature alarm values or mute the buzzer if the temperature is within acceptable operational limits for your application. |
Specifications
| Feature | Detail |
|---|---|
| Model Name | C226T15A |
| Item Model Number | C226T15A-US |
| Voltage | 120 Vac (US version) |
| Power | 1800 W (15A) |
| Temperature Control Range | -40°F ~ 212°F (-40°C ~ 100°C) |
| Temperature Accuracy | ±1°F (±0.5°C) |
| Timing Range | 0 ~ 99 hours and 59 minutes |
| Probe Type | IP67 Waterproof Temperature Probe |
| Display Type | LCD with White Backlight |
| Control Method | Button Control |
| Item Weight | 8.1 ounces |
| Package Dimensions | 5.39 x 3.58 x 3.5 inches |
Applications
The INKBIRD Plug-in Thermostat is highly versatile and can be used in various settings requiring precise temperature control.
- Reptile Terrariums: Maintain optimal temperatures for reptiles.
- Aquariums: Regulate water temperature for aquatic life.
- Greenhouses: Control heating or cooling for plant growth.
- Homebrewing & Fermentation: Ensure stable temperatures for brewing processes.
- Refrigeration: Manage temperatures for small refrigerators or coolers.
- Heaters & Fans: Automate heating or cooling in rooms or specific areas.
- Incubation: Provide consistent temperatures for hatching eggs.

Versatile Applications: This image showcases the wide range of uses for the Inkbird thermostat, from controlling environments for pets and plants to managing temperatures for food and beverage processes.
Warranty and Support
For warranty information and technical support, please refer to the official Inkbird website or contact their customer service directly. Keep your purchase receipt for warranty claims.
User Manual (PDF): For a downloadable PDF version of the user manual, please visit: INKBIRD User Manual PDF
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