How to connect Bosch Sense II heat pump with Reduxi controller
Add the Worcester Bosch Greenstar Sense II to the Reduxi Controller.
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Photo of two white Worcester Bosch Greenstar Sense room controls on a white background. Left: larger controller with a blue backlit display showing 21.0 degrees C, a smaller value 8, a round dial and button labels auto, man, info, menu. Right: smaller square controller with a small display showing 21.0 degrees C and a round dial. WORCESTER logo above each display.
1 Technical documentation
The manufacturer describes how to connect and configure the device in its literature.
- Greenstar Sense II Installation Manual – Worcester Bosch, installation instructions (PDF)
- Worcester Bosch literature search for Sense – Manufacturer literature page
2 Prepare the device
2.1 Required equipment
- Reduxi Controller
- Greenstar Sense II, installed and configured as described by the manufacturer (see Point 1)
- Laptop or tablet with internet access to configure the device in Reduxi
2.2 About the Greenstar Sense II
Facts from the manufacturer documentation:
- The Greenstar Sense II is a Worcester Bosch weather-compensation controller with a touch-sensitive display.
- It controls up to four heating circuits and two cylinder primary circuits.
- It communicates with the heat source via an EMS 2 BUS or a 2-wire BUS interface.
- It is powered over a 2-core BUS cable at 10–24 V DC. Polarity does not matter.
3 Connect and configure the device
Follow the connection and configuration instructions of the manufacturer (see Point 1).
Keep the Modbus unit ID of the device ready. Normally, 1 is used.
4 Log in to the Reduxi web interface
You can open the Reduxi web interface in two ways:
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Screenshot of three Reduxi mobile app screens side by side, with cyan boxes and number badges 2 to 4. Left screen (dashboard, dark theme): menu icon at top left marked with a box and badge 2; 'reduxi' logo; tabs 'Real time data' (active) and 'Statistics'; price 5.79 € and temperature 3.2 °C; energy flow diagram with a house in the centre (-1.25 kW) and icons with values 69.0 W, 1.3 kW, 1.1 kW (red ring), -165.0 W with 97 % (red ring) and 0.0 W values at the bottom; tabs 'Power' and 'Energy'; bottom navigation: Dashboard, Diagnostics, Device control, Settings. Middle screen (side menu): 'reduxi' logo, 'Number of locations: 1233', heading 'Reduxi device management', entries '+ Add Reduxi location' and 'Reduxi devices' (marked with a box and badge 3), then 'My profile' and 'About app'. Right screen (device page): Back; picture of a black Reduxi controller with two Ethernet ports; status 'Connected'; card 'Update available': 'New update is available for your Reduxi device.' with button 'Download and install update'; card 'Connect to configurator': 'Tunnel connection enables remote access to your Reduxi configurator, without need to be connected to the same local network.' with button 'Activate tunnel connection' (marked with a box and badge 4); card 'Unit details' with field 'Unit ID'.
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Screenshot made of two parts side by side. Left part: Reduxi mobile app screen on a dark background. Top: Back button; picture of a black Reduxi controller with two Ethernet ports and a terminal block; status 'Connected' with a Wi-Fi icon. Card 'Update available': 'New update is available for your Reduxi device.' with button 'Download and install update'. Card 'Connect to configurator' with a key icon: 'Tunnel connection enables remote access to your Reduxi configurator, without need to be connected to the same local network.' and button 'Open configurator', marked with a cyan box and number badge 5. Below: card 'Unit details' with a field 'Unit ID' (value not visible). Right part: Reduxi Configurator opened in a browser, marked with a cyan frame and number badge 6. Header: back arrow, 'Tunnel connection', reload icon. Left sidebar with icons (lightning, chip, lightning bolt, bar chart, gear). Page 'Home' with a green link icon. Green notice: 'New patch available. Click here to apply.' with a close X. Time 09:12:56. Energy flow diagram with a house in the centre (1.700 kW) and icons for grid (0.000 kW), solar (1.700 kW), battery (green, 0.000 kW and 0.800 kW), a device at left (0.900 kW), electric vehicle and a charger or device at bottom. Label 'Energy manager' at the bottom.
http://reduxi.local. You can find the controller's IP address in your router's device list or in the Reduxi app under Reduxi devices.admin · Password: admin (factory default)Text description of this image
Screenshot of the Reduxi Configurator login page in a Chrome browser window. The address bar shows 'Not secure' and 'reduxi.local'; the address bar is marked with a cyan box and an enlarged copy of it (cyan box, text 'Not secure reduxi.local') is shown at the left, connected by a cyan line. Page background: light grey line drawing of a house with solar panels (green), a wall box, an inverter, a car and a charger. Top left: 'reduxi configurator' logo. Login box in the centre with title 'Login', a language selector (English flag, 'English'), a username field and a password field, and a dark 'Login' button.
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Screenshot of the Reduxi Configurator web interface after login, light theme. Top left: 'reduxi configurator' logo. Header bar: 'Home' at left, green 'Connected' status at top right. Left sidebar: expanded section 'Devices' with a list of entries, then collapsed sections 'Manager' and 'Configuration' and 'Settings'. Main area: energy flow diagram. House in the centre with ring, value 24.20 kW. Grid icon at top left, 24.20 kW (red dot on its line). Solar icon at top right, value '-'. Left icon (battery or device), 6.700 kW (green dot on its line). Right icons (battery storage and a device), values '-'. EV charger icon at bottom left, 31.00 kW. A further device icon at bottom right. Label 'Energy manager' below the house.
5 Add the device to Reduxi
Use these steps to add a new device or to edit an existing one.
5.1 Basic settings
Log in locally to the Reduxi Configurator on the controller (see Point 4) and click + Add device.
Enter the basic settings: select the device type and type that match your device and enter a name of your choice.
5.2 Communication settings
Select the communication channel and enter the device configuration:
| Parameter | Value |
|---|---|
| Communication channel | The channel the device is connected through |
| Modbus unit ID | Normally 1
|
5.3 Advanced settings
Enter and choose the advanced settings of the device.
5.4 Test communication
Click Test communication at the bottom of the wizard. It reads the Greenstar Sense II once and saves nothing. If the test succeeds, click Done: only Done creates the device.
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Screenshot of the bottom button bar of a Reduxi Configurator page. Left: button 'Back'. Right: button 'Test communication' (marked with a cyan box) and dark button 'Done'.
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Screenshot of the Reduxi Configurator page 'Communication channel and device configuration'. Connection *: TCP/IP (dropdown). IP *: 192.168.50.243, with button 'Scan for IP'. Port *: 502, with button 'Test port'. Modbus unit ID *: 1. Buttons at the bottom: Back (left), Test communication and Done (right). The Done button is marked with a cyan box.
6 Check the readings
6.1 Last measurements
After communication is established, check the values under Devices in the Reduxi Configurator as an additional test.
6.2 Enable control by Reduxi
Under Devices in the Reduxi Configurator, set the control type of the device to AUTO. Only then do strategy commands affect the device.
To reduce energy costs with dynamic prices and dynamic tariffs, define a strategy as described in Strategies for Reduxi controller.
✓ Summary
Preparation (Points 1–2): Find the manufacturer documentation and prepare the device and the Reduxi Controller.
Greenstar Sense II (Point 3): Connect and configure the device as the manufacturer describes. Note the Modbus unit ID (normally 1).
Add to Reduxi (Points 4–5): Log in to the Reduxi Configurator, add the device and test the communication.
Go live (Point 6): Check the readings and set the control type to AUTO.
→ Common issues
| Issue | Solution |
|---|---|
| Test communication fails | Check the Modbus unit ID of the device. Normally, 1 is used. Check the communication channel and the connection. |
| Open configurator does not open or stays empty | The tunnel is not active yet. Wait about 30 seconds and check that the controller is online. |
Login with admin is rejected |
The password was changed during installation. Ask the installer. The Reduxi account password does not work here. |
reduxi.local does not load |
Your device is not in the same network as the controller. Use the IP address or the tunnel connection. |
| Communication test fails, device shows offline | Check reachability, IP address / port / unit ID, and that the protocol is enabled on the device. |