Trigger with condition to control template sensor update

[CasaNostra (Rob Wilkinson)]

I would appreciate any help with the template yaml below. The entity sensor.mySensor correctly appears on a dashboard but the condition block has no effect on the sensor output which updates whenever the trigger fires (every 30s here)

Any thoughts on what I am doing wrong?

The Jinja2 template editor shows the same behaviour: the output still updates even though the condition evaluates as ‘False’

The functionality to include conditions with triggers has recently been added to template sensors in Home Assistant. Has anyone else experienced problems with making the new functionality work correctly?

Conditions in Trigger-based Template Sensors

It would be great to be able to put conditions inside a trigger-based template sensor, so that whether the sensor updates could be conrolled by the state of something external. Use case for me would be to e.g. have a sensor showing the first time that someone came home in the morning (triggered by presence, but only if the state is empty), or showing me the cost of electricity when my kettle is running, so that I can easily do some statistics on prices when I was using it, rather than at all ti…

My version: Core
2025.3.3
Supervisor
2025.03.2
Operating System
14.2

============================================
YAML
template:

• trigger:
  trigger: state
  entity_id: sensor.solar_load_power
  condition:
  • condition: template
    value_template: >
    {{ (states.input_boolean.mytoggle.state == “on”) }}
• sensor:
  • name: “mySensor”
    unit_of_measurement: “kWh”
    state: >
    {% set result = states(‘sensor.solar_load_power’) | float(0) %}
    {{(result)}}

[NathanCu (Nathan Curtis)]

before we start - go reformat your code in your post - embed it inside preformat (three back-ticks) or use the preformatted text block under the gear in the editor.

It’s impossible to read the (very important) yaml spacing if you dont
How to format your code in forum posts - Community Guides - Home Assistant Community

[123 (Taras)]

@CasaNostra

Has anyone else experienced problems with making the new functionality work correctly?

I just performed a test and confirmed condition works correctly in a Trigger-based Template Sensor.

Try this version:

template:
  - trigger:
      - trigger: state
        entity_id: sensor.solar_load_power
    condition:
      - condition: state
        entity_id: input_boolean.mytoggle
        state: 'on'
    sensor:
      - name: mySensor
        unit_of_measurement: kWh
        state: "{{ trigger.to_state.state | float(0) }}"

---

I agree with NathanCu that it would be preferable for you to post your YAML as formatted code. It’s challenging for us to examine what you posted and confirm all of its syntax and indentation is correct. Refer to the linked guide in NathanCu’s post.

[CasaNostra (Rob Wilkinson)]

Good advice. Thankyou. There was indeed a syntax error

[CasaNostra (Rob Wilkinson)]

Helpful link, thankyou