Honeywell T4 Thermostat: Easy Control
The Honeywell T4 thermostat offers precise and customizable temperature control for your home. Available in standard, wireless (T4R), and OpenTherm (T4M) versions, it simplifies heating management with programmable schedules and advanced compatibility. Whether you need a traditional or smart thermostat, the Honeywell T4 adapts to your needs effortlessly.
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Honeywell T4: Programmable Thermostat
Key Features:
- Programming: Allows you to set personalized heating schedules.
- Remote Control (only T4R model): Manage the temperature through a wireless thermostat.
- OpenTherm Compatibility (only T4M model): Communicates with OpenTherm-compatible boilers for more precise and efficient control.
- User-Friendly Interface: Easy to use and program.
Simplified Technical Details:
- T4R: Wireless thermostat, communicates with the boiler via Receiver Box.
- T4M: Thermostat for OpenTherm boilers, offers advanced temperature control and signals any boiler errors.
Product Information:
- Brand: Honeywell
- Model: T4 (also available in T4R and T4M versions)
- Purchase: Available on Amazon:
Setting the Current Time on the Honeywell T4 Thermostat
- Access Settings: Press the “Menu” or “Settings” button.
- Navigate to the Time Menu: Use the directional buttons to find the “Time”, “Date & Time” or similar option.
- Set the Time: Follow the on-screen instructions to set the current time using the directional and confirm buttons.
Note: Refer to your Honeywell T4 manual (https://homecomfort-techlit.resideo.com/emeadocuments/pim%20-%20renamed/t4-t4r-t4m-gu-it2h32318059-006uk07.pdf) for specific instructions.
Setting Temperatures
To set the comfort and reduced temperatures on the Honeywell T4 thermostat, follow these steps:
Access the Menu: Press the “Menu” button or a similar symbol on the thermostat.
Select “Programming”: Use the directional buttons to scroll through the list of options and select “Programming”.
Choose the Mode: Choose between “Manual”, “Scheduled”, or “Automatic” based on your preferences.
- Manual: Set a fixed temperature by pressing the “+” or “-” button until the desired temperature is reached.
- Scheduled: Create a schedule with different temperatures at specific times (e.g., 20°C during the day, 18°C at night). The Honeywell T4 thermostat will guide you through setting the times and temperatures for each period of the day.
Confirm Settings: Save the changes by pressing the “OK” button or a similar symbol.
Common Issues with the Honeywell T4 Thermostat
Blank Screen: Check the batteries (T4 and T4R) or verify if the OpenTherm boiler is powered (T4M). Replace the batteries or contact the installer if necessary.
Dead Batteries: Replace the batteries when the screen shows the battery symbol.
Critical Batteries: Immediately replace the batteries if the thermostat flashes the “+” symbol.
The Boiler Won’t Turn On: Ensure that the set temperature is higher than the actual room temperature, that the heating system is turned on, and (only for T4R) that the receiver has a wireless signal.
The Heating System Doesn’t Respond to Temperature Changes: Verify that the set temperature is higher than the actual room temperature, that the heating system is turned on, and (only for T4R) that the receiver has a wireless signal.
Temperature Sensor Error: Contact the installer to repair or replace the faulty temperature sensor.
Specific Issues with Honeywell T4R (Wireless):
Lost Wireless Signal: Move the thermostat to another location to restore communication if it flashes the “+” symbol and the receiver’s LED light flashes red.
No Wireless Connection: Check if the receiver is powered by pressing the button to turn on the boiler. If the receiver is powered but no wireless binding data is stored, follow the pairing procedure described in the installation guide or contact the installer.
FAQ – Frequently Asked Questions about the Honeywell T4 Thermostat
Open the battery cover located on the back of the thermostat.
Remove the old batteries and insert two new AAA batteries, ensuring they are placed in the correct direction following the + and – symbols.
Close the battery cover.
The flashing “+” symbol indicates that the batteries are low and need to be replaced immediately.
Press the “+/-” button on the thermostat to increase or decrease the desired temperature.
Check that the thermostat’s batteries are charged.
Move the thermostat to another location to see if the wireless connection improves.
Refer to the user manual (link provided in the description) for detailed instructions on how to set up heating schedules and desired temperatures.
The flashing “s” icon indicates that the OpenTherm boiler has sent an alarm. For more information about the error, refer to the “OpenTherm Boiler Alarms” menu.
Yes, the Honeywell T4 thermostat can be used with any type of boiler, but the advanced OpenTherm functionalities will only be available if an OpenTherm-compatible boiler is used.
The flashing red LED indicates that the wireless connection between the thermostat and the receiver has been lost. Try moving the thermostat to another location.
Press the button on the receiver once to manually turn the boiler on or off. When the boiler is on, the LED on the button will be steadily yellow.
Refer to the user manual (link provided in the description) or contact Honeywell customer service for further assistance.
Installation
To install the Honeywell T4 thermostat, follow the instructions in the manual carefully. First, disconnect power from your heating system to ensure safety. Mount the thermostat on an interior wall, avoiding heat sources or direct sunlight, and ensure it’s level. Connect the appropriate wires to the terminals following the manual’s diagram. Once installed, restore power and verify its functionality. For advanced features, consult the wireless or OpenTherm models for optimal compatibility with your heating system.
Honeywell T4 Technical Specifications
| Feature | Description |
|---|---|
| Model | Honeywell T4 |
| Type | Programmable thermostat |
| Display | Backlit digital |
| Power Supply | Batteries |
| Features | Daily and weekly programming, manual temperature control, vacation mode |
| Compatibility | Traditional heating systems |
| Additional Options | Also available in wireless version (T4R) and with OpenTherm control (T4M) |
