Open the web interface

The controller's web interface is available on your local network when its web server is enabled.

On this page

Open the controller

Connect your phone or computer to the controller's local network.
Find its address. HomeKit-compatible firmware uses http://Serin-XXXX.local, with the controller's own four-character suffix. On Matter-compatible firmware, use the IP address from your router's connected-device list, because the .local address may not open. ESPHome uses http://<device-name>.local; after adding it to ESPHome, use the name you chose. The ESPHome dashboard also shows the IP address.
Open that address in a browser. If that address does not open, find the controller in your router's connected-device list and open http://<controller-ip>.

Use http://, not https://.

Controls and settings

On HomeKit-compatible and Matter-compatible firmware, Climate changes mode and temperature; Airflow changes fan and vanes. See the settings reference for other sections.

Climate controls showing mode, target temperature and measured room temperature — Climate controls in the HomeKit-compatible web interface.

Closed section headings from Airflow to Diagnostics · Logs, including Modes, several with a status such as Connected, Paired, or the Wi-Fi signal in dBm — Web interface section headings. On Matter-compatible firmware the **HomeKit** section is named **Matter**. View full-size screenshot.

ESPHome's page shows configured entities and works while Home Assistant is unavailable. Keep ESPHome web server enabled when customizing the configuration.

Device settings with a name, temperature unit, vane type and Save Settings button — Device settings in the HomeKit-compatible web interface.

Modes and temperature ranges

The Modes section controls availability and target limits for each mode. Set modes and temperature ranges for your indoor unit.

Identify a controller

On HomeKit-compatible and Matter-compatible firmware, select Firmware > Flash LED. That controller's light blinks white for three seconds.

If the interface does not open

If the IP address also fails, follow Wi-Fi recovery. A reachable controller with missing heat-pump data needs CN105 troubleshooting.