# Serin Controller app pairing and codes

> Find a controller pairing code, add another Matter app, or reset a HomeKit or Matter pairing while keeping Wi-Fi.

Source: https://serin-labs.com/controller/pairing.html
Last updated: 2026-10-27

App pairing is separate from Wi-Fi and Serin Link pairing.

## Choose the action

For a first installation, use the [setup guide](https://serin-labs.com/controller/manual.html#install); for a new router, use [Change Wi-Fi](https://serin-labs.com/controller/wifi.html).

A HomeKit or Matter pairing reset keeps Wi-Fi, settings and a paired Serin Link. A [factory reset](https://serin-labs.com/controller/reset.html#factory-reset) clears them.

## Reset or add pairings

### Apple Home (HomeKit-compatible firmware)

1. In the Home app, open the thermostat's settings and select **Remove Accessory**.
2. In the controller's web interface, expand **HomeKit** and select **Reset HomeKit Pairing**. The button appears only while the controller is paired. Confirm, and the controller restarts.
3. Follow [Apple Home setup](https://serin-labs.com/homekit/setup.html#pair) to add it again with the same setup code.

[![HomeKit section showing Paired with HomeKit, 1 controller, a Show Setup Code button, and a Reset HomeKit Pairing button](https://serin-labs.com/assets/content/860/media/webui-homekit-paired.png.f7a3916d2703.webp)](https://serin-labs.com/assets/media/webui-homekit-paired.png)

[View full-size pairing controls](https://serin-labs.com/assets/media/webui-homekit-paired.png).

If you reset pairing without removing the thermostat first, the old one stays in the Home app as not responding. Remove it there, then add the controller again.

### Google Home, Alexa and SmartThings (Matter-compatible firmware)

A Matter-compatible controller can be added to more than one app at a time. Expand **Matter** in the web interface to manage them.

- **Add it to another app.** Select **Open Pairing Window**. Within 15 minutes, add a Matter device in the second app and scan the code shown by **Show Setup Code**.
- **Remove one app.** Remove the thermostat in that app first. If it still appears under **Paired Controllers**, select **Remove** beside it. The other apps keep working.
- **Remove every app.** Select **Reset Matter Pairing**. The controller restarts, keeps its Wi-Fi network, and must be added again in each app.

Apple Home appears twice under **Paired Controllers**, as Apple and Apple Keychain. Both belong to the same home.

### Find the setup code again

In the web interface's pairing section, select **Show Setup Code** if already paired. Resetting pairing does not change the code.

For a Matter-compatible controller that has never joined a network, see [Matter setup](https://serin-labs.com/matter/setup.html#pair).

## Home Assistant integration

ESPHome uses its Home Assistant integration and API credentials rather than a HomeKit or Matter setup code. Use the [Home Assistant setup instructions](https://serin-labs.com/esphome/setup.html#pair) to add it. If you replace its YAML, [preserve the device name and credentials](https://serin-labs.com/controller/customize-esphome.html#generate).

## Verify control after pairing

Check the app's temperature reading and send a command to the indoor unit. For discovery or timeout problems, use [troubleshooting](https://serin-labs.com/troubleshooting.html).