Pair sensor

The Pair sensor action adds a new paired sensor to a Guardian valve controller.

This is handy when you want to add a leak sensor from an automation or a script instead of pairing it by hand, for example as part of a setup routine when you install a new sensor.

Using this action from the user interface

If you prefer building automations and scripts visually, Home Assistant walks you through this action step by step. You pick what to target, tweak a few options, and save. No YAML knowledge required.

To pair a sensor from an automation or a script:

1. Go to Settings > Automations & scenes.
2. Open an existing automation or script, or select Create automation > Create new automation.
3. If you’re setting up a new automation, add a trigger in the When section. Scripts don’t need a trigger. They run when something else calls them.
4. In the Then do section, select Add action.
5. From the search box, search for and select Guardian: Pair sensor.
6. Select the Valve controller to add the sensor to, and enter the sensor UID.
7. Select Save. This action does not support targets. In the UI, you are not prompted to choose an area, entity, or label. You select the valve controller through the Valve controller option instead.

Options in the UI

Using this action in YAML

If you work directly in YAML, or you want to know exactly what Home Assistant does under the hood, this section has the technical reference. It lists the field names you use in YAML, their types, and which ones are required.

In YAML, refer to this action as guardian.pair_sensor. A basic example looks like this:

action: guardian.pair_sensor
data:
  device_id: 1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d
  uid: "5410EC688BCF"

This pairs the sensor with the given UID to the selected valve controller.

Options in YAML

Try it yourself

Ready to test this? Open Developer tools > Actions, search for this action, fill in the fields, and select Perform action. You see what happens on your actual entitiesAn entity represents a sensor, actor, or function in Home Assistant. Entities are used to monitor physical properties or to control other entities. An entity is usually part of a device or a service. [Learn more] without writing a line of YAML.

Still stuck?

The Home Assistant community is quick to help: join Discord for real-time chat, post on the community forum with the action you’re calling and what you expected to happen, or share on our subreddit /r/homeassistant.

Related actions

These actions work well alongside this one:

• Unpair sensor: Removes a paired sensor from the valve controller.

• Upgrade firmware: Upgrades the device firmware.