Introduction

Zigbee Thermostatic Radiator Valve

User Manual

TRV Gen2 is a smart thermostatic radiator valve designed to precisely regulate your radiator, enabling accurate control of your room temperature. The device supports app-based remote control and allows users to set smart schedules for automated temperature management. It features a built-in intelligent temperature control algorithm and window-open detection, which automatically adjusts the valve status when environmental changes are detected, helping to reduce energy waste. With the included adapters, it is compatible with most standard valve interfaces.

Remote Control

Compact Design

Dual-Mode Connectivity

Smart Precise Temp Control

Open Window Detection

HD IPS Screen

Smart Schedule

Remote Temperature Source

① Middle Button

② Rotary Knob Button

③ IPS Color Display

④ Battery Cover Latch

⑤ Radiator Valve Union Nut

    Screen Display

    Description

    The large font indicates the set temperature, and the small font indicates the current room temperature.

    Rotate the device knob to adjust the set temperature. The setting will be saved automatically 2 seconds after you stop rotating. You can also press the middle button to save the current setting immediately.

    One bar: Weak signal strength
    Two bars: Medium signal strength
    Three bars: Strong signal strength

    Heating

    Auto Mode

    *When adjusting the temperature manually under Auto mode, the manual setting will take effect temporarily until the next schedule starts, after which the schedule will resume. Both the Manual “” and Auto “” icons will be displayed on the screen during this period.

    Manual Mode

    Short press the device button to switch between Auto mode and Manual mode.

    OFF (Frost Protection mode) (Default: 5°C)
    After setting the target temperature to the minimum value of 5°C, continue turning the knob toward a lower temperature. The display will show “OFF”. After 2 seconds of no operation, the device will automatically save the setting and enter OFF mode.
    In Frost Protection mode, the app will also display OFF.
    The minimum set temperature supported by the device is 5°C.

    Network Pairing Indicator
    When the device is OFF, long press the middle button for 2 seconds to enter pairing mode. The pairing indicator will flash.

    Boost Mode

    After Boost mode is enabled, the temperature will be set to the maximum value, and the valve will stay open to raise the room temperature. The mode will then turn off automatically and revert to the previous settings. This mode can only be activated via the App. Once activated, the screen will show the word “BOOST” and the corresponding icon ““.

    Open Window Detection (animated prompt)

    If during heating the room temperature drops by more than 1.5°C within 5 minutes, or the door/window sensor linked to the device detects an open state, the device will initiate open window detection and stop heating. The screen will show a “Window Open” animation.

    Note: The detection can be cancelled in the following ways:

    1. Adjust the temperature or change the mode on the device.
    2. The detected temperature rises by more than 1.5°C within 5 minutes.
    3. The door/window sensor detects a closed state.

    Child Lock
    Device operation can be locked to prevent accidental changes. Long press the middle button for 3 seconds to enable/disable the Child Lock. The screen will display “Child Lock Enabled”/“Child Lock Disabled”.

    Temporary Timer
    When the Temporary Timer is enabled, the device will operate at the set temperature for a specified duration, after which the Temporary Timer will end, and the device will return to the previous working mode and temperature setting. This function can only be activated in the app.

    Valve Calibration Failed
    This indicates that the device is not properly installed on the valve. Please reinstall the device correctly.

    Low Battery (replace with new batteries within 1 week)
    Specification
    TRV Gen2

    Product Series

    Thermo Series

    Product Name

    TRV Gen2

    Product Type

    Zigbee Thermostatic Radiator Valve

    Model

    TRV-ZBT

    MCU

    TLSR8258

    Input

    3V⎓ (2 × 1.5V batteries)

    Battery Type

    1.5V LR6 alkaline AA batteries

    Zigbee

    IEEE 802.15.4

    Thread Connection

    M30x1.5mm

    Temperature Setting Range

    5℃-30℃

    Net Weight

    169 g (with batteries)

    Working Temperature

    -10℃~50℃

    Working Humidity

    5% – 95% RH, non-condensing

    Color

    White

    Housing Material

    PC

    Product Dimension

    50×50×82.9mm

    Operating Cycle

    10,000 cycles

    Certification

    CE / ROHS

    Device Installation

    eWeLink Ecosystem User Guide

    ① Download the eWeLink App

    Please download the “eWeLink” App from the Google Play Store or Apple App Store.

    1. Rotate the Battery Bottom Cover in the Indicated Direction to Open the Battery Compartment.

    2. Install the Battery Base.

    width="100" Please check if your valve connection is of the M30 x 1.5 mm specification.

    • If the valve connection is M30 x 1.5 mm, you can install the product directly onto the valve.
    • If the valve connection is not M30 x 1.5 mm, you will need to install the valve adapter onto the valve first.

    3. Scan the QR Code On the Device

    Open the eWeLink app and enter “Scan”

    Scan the QR code on the device

    4. Power On the Device

    Remove the battery insulation strip to power on the device.

    After power-on, the screen will display “Setup”. Double-press the middle button to adjust the screen orientation.

    width="100" When the screen shows “Ready”, short press the device button to return to “Setup”.

    5. Install the Device Body

    When the screen shows “Ready”

    Align the device with the battery base already installed on the valve and rotate it to secure

    6. Calibrate the Device

    After the device is firmly installed, quickly press the middle button

    The screen will display a “Calibrate” animation, indicating that the device is adapting to the valve. Upon success, the screen will show the current room temperature

    width="100"

    If “” appears, it means the device is not properly installed on the valve. Try the following:

    1. Remove and reinsert the batteries to restart the device, repeat the above steps, ensure you have selected the most suitable adapter, and only install the device after the screen displays “Ready”.
    2. If you do not want to reinstall the batteries right now, you can skip this prompt and continue with network pairing. After pairing is complete, confirm that the device is correctly installed on the valve, then perform stroke calibration on the eWeLink app in either of the following ways:
      ● On the device settings page, tap “Stroke Calibration” to start calibration.
      ● On the device details page, tap the calibration prompt to enter the calibration page and start calibration.

    Thermostat Mode

    The device has two modes: Auto mode and Manual mode. Short press the middle button to switch between modes.

    When the screen displays the “” icon, it indicates auto mode

    When the screen displays the “” mode icon, it indicates manual mode

    Anti-calcification Function

    The device automatically activates every Monday at 12:00 noon for maintenance to prevent valve scaling. During this period, the screen will display “Calibrate”.

    Standalone BLE Pairing

    If you are not an eWeLink user but are using Home Assistant (HA) or other third-party platforms, you can first wake the device, click the middle button once, and then within 3 seconds long press the middle button for 5 seconds. The device will enter standalone Bluetooth pairing mode without clearing existing data.

    Screen Orientation Rotation

    Double-press the middle button to rotate the screen orientation 90° clockwise.

    Device-Side Error States and Solutions

    Error Code

    Issue

    Solution

    Battery depleted

    Replace the batteries immediately.

    Valve calibration failed

    1. Check that the valve is installed correctly and reinstall the device.
    2. Follow the prompts in the app to perform automatic calibration.

    Battery abnormal

    Replace the batteries and try again.

    App-Side Alerts

    App Alert

    Description

    Solution

    Low battery, unable to perform firmware update

    The current battery level is too low and may affect the stability of the update.

    Replace the batteries before performing the firmware update.

    Low battery, unable to function normally

    The current battery level is critically low and the device may not operate properly.

    Replace the batteries immediately.

    Internal temperature sensor abnormal

    The built-in temperature sensor is detecting an abnormality.

    Check the device status. If the issue persists, contact after-sales support.

    External temperature sensor abnormal

    The external/remote temperature sensor connection is abnormal.

    Check whether the external temperature sensor is online, or reconfigure the remote temperature source.

    Replace the Batteries

    Push the metal spring outward first to release it from the buckle; then lift the metal spring upward to open it.

    Install the batteries correctly according to the positive and negative polarity markings on the spring, then press the metal buckle back down into place to secure the batteries.

    Reinstall the cover and lock it securely.

    Remove the Device

    First remove the main device unit.

    Then remove the device battery base from the valve.

    Restore Factory Setting

    Hold down the Middle Button while inserting the batteries.

    The screen will display “Resetting”. After several seconds, the device restores factory settings and restarts automatically.

    width="100" All previous settings will be erased after restoring factory settings.

    Add Device to eWeLink App

    Method 1: Zigbee Pairing

    1.1. Add SONOFF Zigbee gateway

    Compatible Gateways

    Recommended SONOFF gateway models

    ZBBridge-P, ZBBridge-U, NSPanel Pro, iHost

    Other compatible SONOFF gateway models

    ZBDongle-P, ZBDongle-E, Dongle-M, Dongle-PMG24, Dongle-LMG21

    width="100" Ensure the Zigbee gateway is updated to the latest version.

    1.2. Add Device

    In Manual mode, rotate the knob to lower the set temperature until the screen displays “OFF”

    When the device is OFF, long press the middle button for 2 seconds

    Check that the pairing icon “” is flashing

    Select “Zigbee Pairing”

    Select Zigbee gateway

    Wait until the addition is done

    width="100" Once the device enters pairing mode, it will exit this mode if no gateway pairing is completed within 3 minutes. To re-enter pairing mode, with the screen showing “OFF”, long-press the middle button for 2 seconds until the network icon “” on the screen flashes.

    Method 2: BLE Pairing

    In Manual mode, rotate the knob to lower the set temperature until the screen displays “OFF”

    When the device is OFF, long press the middle button for 2 seconds

    Check that the pairing icon “” is flashing

    Select “BLE Pairing”

    Tap “Next”

    Choose the device and tap “connect”