Introduction
Zigbee Smart Thermostat
User Manual
Thermostat Core is a smart thermostat designed for hydronic underfloor heating and boiler heating systems. It can control the operation of water underfloor heating systems and boilers based on the current room temperature and target temperature, helping users achieve comfortable and precise indoor temperature management.
The product provides a maximum 3A active output, which can be used to control heating devices such as hydronic heating actuators within the specified load requirements. It also provides an independent dry contact output for controlling compatible boilers, enabling coordinated control between the water underfloor heating system and the boiler.
Remote Control
Remote Temperature Source
Energy Saving
Window Open Detection
Hydronic Underfloor Heating & Boiler Control
NTC Overheat Protection
Smart Schedule
Radar-Activated Display
① Center Button
② Rotary Button
③ Display Screen
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Screen Display |
Description |
SET |
Indicates that no target temperature has been set. Rotate the knob on the device to display the set temperature. The display will return to the ambient temperature after 3 seconds. |
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Indicates the current ambient temperature. |
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Indicates that heating is active. |
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Auto Mode In Auto Mode, manually adjusting the temperature will temporarily override the schedule. The device will follow the preset schedule again when the next scheduled event starts. During this period, both the manual “ |
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Manual Mode Short press the center button to switch between Auto Mode and Manual Mode |
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Off Mode (Anti-Freeze Mode) (Default: 5°C) |
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Pairing Indicator |
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Child Lock The device operation can be locked to prevent accidental changes to settings. Press and hold the center button for 3 seconds to enable or disable the child lock. The screen will display the child lock status (“Child Lock Enabled” / “Child Lock Disabled”). |
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Boost Mode When Boost Mode is enabled, attempting to adjust the temperature locally will cause “HI” to flash twice, indicating that the temperature cannot be adjusted directly. Press the rotary button to exit Boost Mode before adjusting the temperature. |
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Open Window Detection If the room temperature drops by more than 1.5°C within 5 minutes during heating, or if a paired door/window sensor detects that a door/window is opened, the device will activate window open detection and stop heating. The screen will display “Hi”. Note: Detection can be cancelled in the following ways:
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Factory Reset |
Specification
Product Series
Thermo Series
Product Name
Thermostat Core
Product Type
Zigbee Smart Thermostat
Model
TP-WGZBA
Wireless Connection
Zigbee 3.0
Zigbee Standard
IEEE 802.15.4
Applicable System
Water Heating System
Installation Method
Flush Wall Mount
Rated Parameters
Max. 3A 100-240V~ 50/60Hz
Water Heating Actuator Output
Active Relay Output
Maximum Output Load
3A
Load Type
Resistive Load
Boiler Control Output
Passive Dry Contact Output
Boiler Control Terminals
COM, NO
Temperature Setting Range
5~30℃
Radar Detection Distance
Low: approx. 0.3 m; Medium: approx. 0.6 m; High: approx. 1 m
External NTC Floor Temperature Sensor
10KΩ NTC, B Value 3950K
Product Dimensions
86×86×45.5mm
Operating Temperature
0°C to 50°C
Operating Humidity
≤90% RH, non-condensing
Net Weight
155 g
In-Wall Depth
31.5 mm
Mounting Screw Hole Distance
60mm
Product Color
SONOFF White
Housing Material
PC
Rated impulse voltage
4KV
Diameter of wiring (recommend)
24AWG-12AWG (0.2mm²-3.5mm²)
Pollution Degree
II
Automatic Operation Cycles
10,000 cycles
Controller Action Type
1.B
Operating Altitude
2000 m
Certifications
CE, RoHS
Device Installation
Download the eWeLink App
Please download the “eWeLink” App from the Google Play Store or Apple App Store.
Scan the QR Code On the Device
Open the eWeLink app and enter “Scan”
Scan the QR code on the device
Device Installation
Safety Instructions
- Always turn off the main power supply before installation, removal, maintenance, or wiring.
- This product involves mains voltage wiring. Installation must be performed by a qualified electrician in accordance with local laws, regulations, and electrical standards.
- Do not touch terminals, exposed wires, or remove the device while power is connected.
- Ensure all wires are correctly connected and terminals are securely tightened before powering on.
- Do not exceed the rated current or voltage of the terminals.
- COM/NO are dry contact outputs. Do not connect mains voltage directly to the dry contact terminals.
- Do not disassemble, modify, or repair the device by yourself. Contact after-sales service or qualified professionals for device failures.
- To ensure electrical safety, install a miniature circuit breaker (MCB) or residual current operated circuit breaker with integral overcurrent protection (RCBO) rated at 16A and compliant with local safety standards before installing TP-WGZBA.
Installation Dimensions
Before installation, confirm that the internal dimensions of the wall box, mounting hole spacing, and wiring space are sufficient to accommodate the embedded part of the product. After confirming installation requirements are met, disconnect the power supply and proceed with wiring.
Power Off
Preparation Before Installation
- Confirm that the flush box size and wall space meet installation requirements.
- Ensure that the power supply wires, load wires, or boiler control wires are prepared in advance.
- If an external temperature sensor is required, route the sensor cable in advance and avoid running it parallel to strong current cables for a long distance.
- Prepare tools such as a screwdriver, voltage tester, and insulation tape.
Wiring
3A Relay Load Wiring
Applicable for heating devices such as water underfloor heating actuators.
Connect the thermostat N and L terminals to the power supply neutral wire and live wire respectively. Connect the actuator neutral wire to the same power supply neutral line (if already connected, the existing wiring can remain). Connect the controlled live wire to the thermostat L Out terminal.
Note:
The maximum load current is 3A. If additional neutral wire connections are required, use external terminal blocks that comply with local electrical regulations. Do not force multiple wires into terminals beyond their rated capacity.
Boiler Dry Contact Wiring
Applicable for boilers equipped with passive dry contact thermostat inputs.
Connect the two boiler thermostat control wires to the COM and NO terminals.
Note:
COM/NO are dry contact outputs used only for boiler switch control. Do not connect them directly to mains power.
Installation
Ensure the “UP” mark on the base is facing upward, then fix the base to the wall box with screws.
Align the panel with the base and snap it into place.
Power On
After confirming that wiring and installation are correct, restore the power supply.Removing the Panel
Disconnect the power supply.
Insert a flat-head screwdriver into the removal slot at the bottom of the device and gently pry outward to release the clips.
Remove the panel.
Do not use excessive force to avoid damaging the panel or clips.
Restore Factory Setting
Press and hold the device center button while powering on the device, or restore factory settings through the App. “FA” will flash for 3 seconds, and the device will restart with factory settings restored.
BLE OTA
Press and hold the device center button while powering on the device, or restore factory settings through the App. “FA” will flash for 3 seconds, and the device will restart with factory settings restored.
Step 1: Enable BLE Pairing Mode
BLE pairing mode can be enabled in either of the following ways:
- Enable BLE pairing mode from the device page in Home Assistant or Samsung SmartThings.
- Wake up the device, press the device button once, and then press and hold the button for approximately 5 seconds within 3 seconds.
Enabling BLE pairing mode will not clear the existing pairing information or device settings.
Step 2: Update the Firmware in the eWeLink App
Open the eWeLink App and go to:
Profile > Pilot Features > Bluetooth OTA Update
Search for and select the corresponding device, then follow the instructions on the page to complete the firmware upgrade.
Device Abnormal Status and Solutions
| Error Code | Problem | Solution |
| F0 | Built-in temperature sensor abnormality | Please contact customer service |
Add Device to eWeLink App
Add SONOFF Zigbee gateway
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Compatible Gateways |
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Recommended SONOFF gateway models |
ZBBridge-P, ZBBridge-U, NSPanel Pro, iHost |
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Other compatible SONOFF gateway models |
ZBDongle-P, ZBDongle-E, Dongle-M, Dongle-PMG24, Dongle-LMG21 |
Ensure the Zigbee gateway is updated to the latest version.Add Device
Check that the pairing icon “
” is flashing
Select “Add Device”
Select the Zigbee gateway.
Wait until the addition is done
When powered on for the first time, the device automatically enters pairing mode. The pairing indicator “” is flashing, Follow the App instructions to add the device.
①If the device remains unpaired for 3 minutes after entering pairing mode, it will exit pairing mode automatically. To enter pairing mode again, switch the device to Manual Mode, rotate the knob counterclockwise until the screen displays “OF“, then press and hold the center button for 2 seconds. The pairing icon “” will start flashing.
②If the page cannot be displayed after scanning the device QR code, tap “+” in the upper-right corner of the eWeLink App homepage, select “Add Device“, and follow the instructions to complete pairing.
Rotate the knob counterclockwise in Manual Mode to lower the set temperature until the screen displays “OF”.
When the device is in OFF status, press and hold the center button for 2 seconds.
Working Mode
The device supports Auto Mode and Manual Mode. Short press the device center button to switch between the two modes.
The screen icon “
” indicates Auto Mode.
The screen icon “
” indicates Auto Mode.