1. Introduction
The Funcilit T4000ES Learning Thermostat E is a smart, programmable thermostat designed to optimize your home's heating and cooling for comfort and energy efficiency. It learns your preferences, adjusts automatically when you're away, and can be controlled remotely via a smartphone app. This manual provides essential information for installation, operation, and maintenance.
2. Safety Information
- Always turn off power to your heating and cooling system at the circuit breaker before installing or servicing the thermostat.
- Ensure all wiring is performed according to local electrical codes and regulations.
- If you are unsure about any part of the installation process, consult a qualified HVAC professional.
- Do not expose the thermostat to water or extreme temperatures.
3. Package Contents
Verify that your package contains the following items:
- Funcilit T4000ES Learning Thermostat E unit
- Wall plate
- Mounting screws and wall anchors
- Installation guide (this manual)
4. Setup and Installation
Follow these steps to install your Funcilit T4000ES Learning Thermostat E:
- Turn off Power: Locate your circuit breaker panel and turn off the power to your heating and cooling system. Confirm the system is off by trying to adjust your old thermostat.
- Remove Old Thermostat: Carefully remove the cover of your old thermostat. Take a picture of the wiring connections before disconnecting any wires. This will serve as a reference.
- Label Wires: Use the provided labels (if any) or create your own to mark each wire according to its terminal on the old thermostat.
- Disconnect Wires: Disconnect the wires from your old thermostat.
- Mount Wall Plate: Remove the old thermostat's wall plate. Mount the new Funcilit T4000ES wall plate using the provided screws and anchors. Ensure it is level.
- Connect Wires: Connect the labeled wires to the corresponding terminals on the new Funcilit T4000ES wall plate. Refer to the wiring diagram in your quick start guide or the picture you took earlier.
- Attach Thermostat Unit: Gently push the T4000ES thermostat unit onto the wall plate until it clicks into place.
- Restore Power: Turn the power back on at your circuit breaker panel.
- Initial Setup: The thermostat will guide you through the initial setup process on its display. This includes selecting your language, connecting to Wi-Fi, and configuring your heating/cooling system type.

Figure 1: Close-up of the Funcilit T4000ES Thermostat E.

Figure 2: Funcilit T4000ES Thermostat E on a wall.
5. Operating Instructions
The Funcilit T4000ES is designed for intuitive operation, both directly on the device and through its companion app.
5.1 Manual Temperature Adjustment
To adjust the temperature directly on the thermostat, simply rotate the outer ring clockwise to increase the temperature or counter-clockwise to decrease it. Press the thermostat to confirm your selection or access the main menu.

Figure 3: Adjusting temperature manually on the thermostat.
5.2 Remote Control via App
Download the companion app (available for iOS and Android) to control your thermostat from anywhere. The app allows you to:
- Change the temperature.
- Set and modify schedules.
- Monitor energy usage with Energy History.
- Receive alerts and notifications.

Figure 4: Remote control via smartphone app.
5.3 Eco Temperature and Home/Away Assist
The thermostat features an Eco Temperature setting, indicated by a leaf icon, which helps save energy. Home/Away Assist automatically adjusts to an Eco Temperature when it detects no one is home, preventing heating or cooling of an empty house.
6. Features
- Smart Learning: Automatically adapts to your routine, saving energy when you're away.
- Remote Control: Adjust temperature from anywhere using your phone, tablet, or laptop.
- Energy Savings: Average savings of 10-15% on heating and cooling bills.
- Easy Installation: Compatible with 85% of 24V heating and cooling systems.
- Voice Assistant Integration: Works with Alexa and Google Assistant for voice control.
- Zoned Temperature Control: Compatible with Nest Temperature Sensors (sold separately) for precise room temperature management.
7. Maintenance
- Cleaning: Wipe the thermostat display and body with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Software Updates: Ensure your thermostat is connected to Wi-Fi to receive automatic software updates, which provide new features and improvements.
- Battery Check: While primarily powered by your HVAC system, some models may have a backup battery. Check the app for battery status and replace if necessary (refer to specific model instructions for battery type and replacement).
8. Troubleshooting
| Problem | Possible Solution |
|---|---|
| Thermostat has no power/blank screen | Check the circuit breaker for your HVAC system. Ensure all wires are securely connected to the wall plate terminals. |
| Incorrect temperature readings | Ensure the thermostat is not exposed to direct sunlight, drafts, or heat sources. Allow time for the thermostat to learn your home's temperature patterns. |
| Cannot connect to Wi-Fi | Verify your Wi-Fi network is active and within range. Restart your router and modem. Ensure correct Wi-Fi password is entered during setup. |
| Heating/Cooling not turning on | Check the thermostat's mode (Heat, Cool, Off). Ensure the desired temperature is set appropriately (e.g., below current room temp for cooling). Verify power to HVAC system. |
9. Specifications
- Model Name: T4000ES
- Brand: Funcilit
- Controller Type: Nest
- Connectivity Technology: Wi-Fi
- Power Source: Battery Powered (low voltage from HVAC system)
- Voltage: 24 Volts
- Material: Plastic
- Display Type: Touchscreen
- Control Type: Button Control
- Control Method: App
- Mounting Type: Wall Mount
- Smart Home Compatibility: Smart Home Compatible (Works with Alexa, Google Assistant)
- Item Weight: 13.1 ounces
- Product Dimensions: 2 x 2 x 2 inches
10. Warranty and Support
The Funcilit T4000ES Learning Thermostat E comes with a manufacturer's warranty. Please refer to the warranty card included in your product packaging for specific terms and conditions. For technical support or further assistance, please visit the official Funcilit website or contact customer service.