2026.6.4
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Set device value

Use this action to control a device manually, even devices without built-in support in Home Assistant. It gives you direct access to the setValue method of the device, which can serve as a workaround when a device is not yet supported or only partially implemented.

If you have multiple hosts, you can choose the one hosting a specific device by setting the Interface to the name you gave it in your configuration.

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 set a device value 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 Homematic: Set device value.
  6. Enter the Address, Channel, Param, and Value and, optionally, a Value type and Interface.
  7. Select Save.

This action does not support targets. In the UI, you are not prompted to choose an area, device, entity, or label.

Options in the UI

Address (Required)

The address of the Homematic device, or BidCoS-RF for the virtual remote.
Channel (Required)

The channel to send the value to.
Param (Required)

The parameter to set, such as STATE or SET_TEMPERATURE.
Value (Required)

The new value to set.
Value type

The type to convert the value to: boolean, dateTime.iso8601, double, int, or string.
Interface

The name of the interface from your configuration. Only needed when you have more than one.

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 homematic.set_device_value:

ActionActions are used in several places in Home Assistant. As part of a script or automation, actions define what is going to happen once a trigger is activated. In scripts, an action is called *sequence*. [Learn more] 
action: homematic.set_device_value
data:
  address: "LEQ1234567"
  channel: 4
  param: SET_TEMPERATURE
  value: 23.0

To set the active profile on a thermostat, pass the value as an integer:

ActionActions are used in several places in Home Assistant. As part of a script or automation, actions define what is going to happen once a trigger is activated. In scripts, an action is called *sequence*. [Learn more] 
action: homematic.set_device_value
data:
  address: "LEQ1234567"
  channel: 1
  param: ACTIVE_PROFILE
  value: 1
  value_type: int

Options in YAML

address string Required

The address of the Homematic device, or BidCoS-RF for the virtual remote.

channel integer Required

The channel to send the value to.

param string Required

The parameter to set, such as STATE or SET_TEMPERATURE.

value any Required

The new value to set.

value_type string

The type to convert the value to: boolean, dateTime.iso8601, double, int, or string.

interface string

The name of the interface from your configuration. Only needed when you have more than one.

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.

Tip

AI assistants like ChatGPT or Claude can also explain actions or suggest the right one when you describe what you want in plain language.

Related actions

These actions work well alongside this one:

  • Put paramset: Manually changes a Homematic device’s paramset using its putParamset method.

  • Virtual key: Simulates a keypress on a Homematic device or virtual remote.

  • Set variable value: Sets the value of a Homematic system variable.

  • Reconnect: Reconnects to all Homematic hubs.

  • Set install mode: Sets a Homematic XML-RPC interface into installation mode.