1. Introduction
The SONOFF Zigbee Thermostatic Radiator Valve (TRVZB) is a smart device designed to control the temperature of your heating system. It integrates with Zigbee 3.0 hubs, allowing for remote control, scheduling, and energy-saving features through the eWeLink app, Amazon Alexa, and Google Home. This manual provides detailed instructions for installation, operation, and troubleshooting to ensure optimal performance and comfort.

Image: The SONOFF Zigbee Thermostatic Radiator Valve shown alongside its control interface on a smartphone.
2. Package Contents
Upon unboxing your SONOFF Zigbee Thermostatic Radiator Valve, please verify that all the following items are included:
- SONOFF TRVZB Device
- Quick Guide
- Valve Adapters (RA, RAV, RAVL, CAL, GIA, M28)
Image: A selection of valve adapters (RA, M28, CAL, RAV, RAVL, GIA) provided for compatibility with different radiator valves.
3. Installation
Follow these steps to install your Thermostatic Radiator Valve:
- Remove Existing Thermostatic Head: Before starting, carefully remove your existing thermostatic head from the radiator valve.
- Insert Batteries: Press the battery compartment latch and remove the shell. Insert three 1.5V LR6 alkaline AA batteries into the device, ensuring correct polarity. Align the battery compartment latch and close the shell. Wait a few seconds until the 'M' icon stops flashing.
- Install Device to Valve Interface: Install the TRVZB device onto the radiator valve interface.
- Initialize Device: Short press the middle button. The 'Ad' icon will start flashing. Wait a few seconds until the device displays the initialization interface, indicating debugging is completed.
Image: A person installing the SONOFF TRVZB onto a radiator valve, demonstrating the physical attachment process.
Video: Official installation guide for the SONOFF Zigbee Thermostatic Radiator Valve, demonstrating unboxing, battery insertion, and mounting the device onto a radiator valve. This video also covers pairing and basic app features.
4. Pairing
To pair your device with the eWeLink app:
- Download eWeLink App: Download the eWeLink App from Google Play Store or Apple App Store.
- Prepare Zigbee Gateway: Ensure you have a Zigbee gateway (e.g., SONOFF ZBBridge-P V1.6.0 or later) and it is properly added to your eWeLink app.
- Enter Pairing Mode: Turn the knob counter-clockwise until the screen displays 'OF'. Short press the middle button for 3 seconds. The screen icon '📶' will flash, indicating the device has entered pairing mode.
- Add Device in App: Open the eWeLink App, navigate to your gateway's homepage, and select 'Add Device'. The app will search for and connect to the TRVZB. Once connected, you can control the device via the app.
Image: The eWeLink app displaying the current temperature and set temperature for the SONOFF TRVZB, illustrating remote control capabilities.
5. Operating Instructions
5.1 Smart Control via eWeLink App
The eWeLink app provides comprehensive control over your TRVZB:
- Remote Control: Adjust temperature settings from anywhere using your smartphone.
- Set Schedules: Create customized heating schedules for different days and times to optimize comfort and energy usage.
- Group Control: Control multiple TRVZB devices simultaneously, allowing for unified heating management across different rooms.
Image: A smartphone screen displaying the smart schedule interface, allowing users to set specific heating intervals for different days.
Image: Multiple smartphone screens demonstrating independent temperature control for different rooms (Kitchen, Baby room, Study room), highlighting the multi-room control feature.
5.2 Voice Control
The TRVZB is compatible with Amazon Alexa and Google Home, allowing for convenient voice control of your heating. Simply use commands like "Alexa, set the baby room temperature to 26." (Requires a SONOFF Zigbee hub).
Image: A person interacting with an Amazon Alexa device to control the room temperature, showcasing the voice control functionality.
5.3 Open Window Detection
The device can automatically detect open windows and temporarily turn off the radiator to prevent unnecessary energy waste. This feature helps in maintaining energy efficiency.
Image: The TRVZB displaying an 'OFF' status, indicating that the open window detection feature has activated to save energy.
5.4 Historical Data
Access up to 6 months of historical heating data through the eWeLink app. This allows you to monitor daily, weekly, and monthly heating consumption, providing insights for better energy management.
Image: A smartphone screen displaying historical temperature and usage projection data, allowing users to review heating consumption over time.
5.5 Percentage Adjusting
The valve opening (or closing) ratio is adjustable, allowing you to fine-tune the heating output for a comfortable temperature. You can set the ratio from 0% to 100%.
Image: A smartphone screen showing the valve opening ratio settings, allowing precise control over the heating output.
6. Troubleshooting
This section addresses common issues and their solutions:
- I. What should I do if the thermostatic radiator valve doesn't turn on after inserting the batteries?
- Ensure that the battery is a non-rechargeable 1.5V LR6 Alkaline AA Battery.
- Ensure that the battery is within the validity period.
- Ensure batteries are in good condition, with no signs of leaks, corrosion, or swelling.
- Ensure batteries are inserted according to their polarity.
- II. What does it mean when the screen keeps displaying '🔒'? What should I do?
It means that the child lock is enabled on the device. Press the "Middle button" for 3 seconds, then the '🔒' on the screen will disappear, with child lock disabled.
- III. What if the screen does not display 'M'?
If the screen displays "F5" or "Ad", press the middle button and "M" will display again.
- IV. How to judge whether the device is in auto mode or manual mode?
Auto mode: When '🕔' is displayed on screen, it means the auto mode is on. Manual mode: When '🕔' disappears on screen, it means the manual mode is on.
- V. How to switch between automatic mode and manual mode?
Shortly press "Middle button" to switch between the two modes.
- VI. What should I do if the device screen display is reversed?
Dismount the shell, and press "Configuration key" for 3 seconds to change the screen display direction.
- VII. How to restore factory settings?
Press "Middle button" for a longer time and at the same time put batteries in, then the screen displays "FA" and blinks for 3 seconds. After that, the device is reset to factory settings and is automatically restarted. Note: All previous settings will be removed after the device is reset to factory settings.
- VIII. What do these Error codes mean and how to solve them?
- F0: It means that the temperature sensor is abnormal, please contact the after-sales personnel.
- F1: It means slow valve operation, please check installation status and heating valve.
- F2: It means an excessively wide adjustment range, please check whether temperature controller is fastened.
- F3: It means an excessively small adjustment range, please check the heating valve.
- F4: It means the battery runs out, please replace the battery.
- F5: It means no valve was detected, please check whether the valve is installed.
7. Specifications
| Feature | Detail |
|---|---|
| Model Name | TRVZB |
| Product Dimensions | 2.34"D x 2.34"W x 3.74"H |
| Color | White |
| Material | PC V0 |
| Power Source | Battery Powered (3x 1.5V LR6 Alkaline AA Batteries) |
| Voltage | 4.5 Volts |
| Connectivity Technology | ZigBee 3.0 |
| Temperature Control Type | Intelligent/Remote |
| Specific Uses For Product | Central Heating System |
| Special Feature | Frost Protection, Open Window Detection |
| Mounting Type | Surface Mount |
| Threaded Connection | M30x1.5mm |
| Temperature Setting Range | 4°C-35°C |
8. Warranty and Support
SONOFF products come with a standard manufacturer's warranty. For detailed warranty information, including terms and conditions, please refer to the warranty card included in your product packaging or visit the official SONOFF website. For technical support, troubleshooting assistance, or to report any issues, please contact SONOFF customer service through their official channels. Keep your purchase receipt as proof of purchase for warranty claims.





