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Very little of that was correctly formatted: please use the </> button, or surround with three backticks:

```
CODE GOES HERE
```

Still not clear what “starting an entity card” means. If you’re manually triggering the automation, it will immediately run the actions. Otherwise it’ll wait for the set time.

If you want to be able to enable / disable it, create a toggle helper (input_boolean) and put that in the condition block:

triggers:
  - trigger: time
    at: input_datetime.invoer_tijd_test
conditions:
  - condition: state
    entity_id: input_boolean.verwarming_enable
    state: 'on'
actions:
  - action: number.set_value
    data:
      value: 15
    target:
      entity_id: number.smo_40_room_sensor_set_point_value_heating_climate_system_1

…then put that toggle on your dashboard to turn the automation on and off.

Thanx for your help. I need some time to do what you proposed. I feel me like a dummy.

[quote=“Tim6, post:18, topic:670139”]
I made an entitycard:

type: entity
entity: automation.verwarming_aan_op_gegeven_tijd
name: verw aan op tijd

When I click on the card I get a window, where I can set the automation on / of.
In that window I also can click on “perform action”.
With the automation “on” nothing happens. When I click on “perform action” the temperature is set immidiatly.

The alias: “Verwarming aan op gegeven tijd” is confusing for you.
I dont want to set verwarming on / off, but set the temperature of the verwarming at a set time.
Therefore the input_boolian does not work.


Thanks you for helping me!
This is working for me:

alias: Verwarming aan op gegeven tijd
description: ""
triggers:
  - trigger: time
    at: input_datetime.invoer_tijd_test
conditions: []
actions:
  - action: number.set_value
    target:
      entity_id: number.smo_40_room_sensor_set_point_value_heating_climate_system_1
    data:
      value: 21
mode: single