Automation write temperature question | Home Assistant | Page 1

dim scarab Feb 2, 2026, 10:43 AM

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Hi All,

I am trying to acheive the following;

When the target temperature on my radiator knob (TADO X via matter) changes, set the target room temperature of my MQTT radiator boosters to match this temperature.

I have already made this in YAML;
⁨⁨```alias: Sync Radiator Valves with Thermostat
description: ""
triggers:

entity_id: climate.smart_radiator_thermostat_x
attribute: temperature
trigger: state
conditions: []
actions:
target:
entity_id:
- number.heatbooster_slaapkamer_achter_ambientcontrol_temp
data:
temperature: >-
{{ state_attr('climate.smart_radiator_thermostat_x', 'temperature') |
float }}
action: climate.set_temperature
mode: single



The Entity_ID are found via developer tools -->  states, and I have attached them in the screenshots

I do see that it is getting triggered, but it does no write the data to the heatboosters
(third screenshot)

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Does anybody know why the value on the MQTT heatmeister booster is not changing to match the radiator knob set temperature?? Eventho it does run correctly

rugged yew Feb 2, 2026, 11:20 AM

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The target isn't a climate, it's just a number. So it doesn't know how to do the climate.set_temperature action on it

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You might have to use an integration specific action to set that particular value

dim scarab Feb 2, 2026, 11:40 AM

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Wait I see!

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but how do I then set the value to match?

unkempt sage Feb 2, 2026, 11:41 AM

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If it's a number entity you can just use number.set_value

alias: Sync Radiator Valves with Thermostat
description: ""
triggers:
  - entity_id: climate.smart_radiator_thermostat_x
    attribute: temperature
    trigger: state
conditions: []
actions:
  - target:
      entity_id:
        - number.heatbooster_slaapkamer_achter_ambientcontrol_temp
    data:
      value: >-
        {{ state_attr('climate.smart_radiator_thermostat_x', 'temperature') |
        float }}
    action: number.set_value
mode: single

dim scarab Feb 2, 2026, 11:42 AM

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I see, the script unfortunately is not working tho... It is still running, but values do not change

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📎 trace_automation.sync_radiator_valves_with_thermostat_2026-02-02T11_41_58.35404400_00.json

rugged yew Feb 2, 2026, 11:44 AM

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What integration is providing that entity?

dim scarab Feb 2, 2026, 11:45 AM

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Providing; Matter

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Receiving MQTT

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but it is receiving the command, I think, because the script is ran automatically if I change the temperature target on the radiator knob

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It just does not sync the target temperature of the booster, yet

unkempt sage Feb 2, 2026, 11:47 AM

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Looks fine to me,

But did you make a custom MQTT number? Of was it auto discovery?

dim scarab Feb 2, 2026, 11:47 AM

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autodiscovered

unkempt sage Feb 2, 2026, 11:48 AM

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First try to set a fixed temperature via Dev tools => Actions

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Does that work?

dim scarab Feb 2, 2026, 11:48 AM

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rugged yew Feb 2, 2026, 11:48 AM

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Some things are not settable over mqtt, only readable

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But that looks like it should work

unkempt sage Feb 2, 2026, 11:49 AM

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a number entity should be setable though. Otherwise the integrarion is wrong in making it a number in the first place.

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A read only number entity in HA is a sensor-entity

dim scarab Feb 2, 2026, 11:50 AM

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Ohkee so I tried this.

It sets the target temperature of the radiator knob

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so that seems correct

rugged yew Feb 2, 2026, 11:50 AM

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unkempt sage a number entity should be setable though. Otherwise the integrarion is wrong in ...

Yeah, I've seen devices report sensors as numbers tho, it's not z2m or whatever's fault to translate that as its told to

unkempt sage Feb 2, 2026, 11:51 AM

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No, you are now setting the radiator, not the booster

dim scarab Feb 2, 2026, 11:51 AM

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this is the booster, functioning well

unkempt sage Feb 2, 2026, 11:52 AM

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can you also try 21.5 ? As that was what the automation tried last time

dim scarab Feb 2, 2026, 11:52 AM

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for set radiator;
⁨```action: climate.set_temperature
target:
entity_id: climate.smart_radiator_thermostat_x
data:
temperature: 21


for set booster;
⁨```action: number.set_value
target:
  entity_id: number.heatbooster_zolderkamer_sander_ambientcontrol_temp
data:
  value: "18"
```⁩

unkempt sage Feb 2, 2026, 11:52 AM

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ow, and in Dev tools, can you do in yaml mode:

#

action: number.set_value
target:
  entity_id: number.heatbooster_zolderkamer_sander_ambientcontrol_temp
data:
  value: 21

dim scarab Feb 2, 2026, 11:53 AM

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Heyy, 21,5 does not work

rugged yew Feb 2, 2026, 11:53 AM

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That's a different entity to the one in your automation

dim scarab Feb 2, 2026, 11:53 AM

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does work with 21.5

dim scarab Feb 2, 2026, 11:53 AM

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unkempt sage ```yaml action: number.set_value target: entity_id: number.heatbooster_zolderk...

Works

dim scarab Feb 2, 2026, 11:53 AM

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rugged yew That's a different entity to the one in your automation

wait, is it?

unkempt sage Feb 2, 2026, 11:54 AM

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yeah

dim scarab Feb 2, 2026, 11:54 AM

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where?

unkempt sage Feb 2, 2026, 11:54 AM

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So did it just work and you looked at the wrong entity? 😄

dim scarab Feb 2, 2026, 11:55 AM

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So do we all agree this then should be correct YAML for the automation?;
⁨```alias: Sync Radiator Valves with Thermostat
description: ""
triggers:

entity_id: climate.smart_radiator_thermostat_x
attribute: temperature
trigger: state
conditions: []
actions:
action: number.set_value
target:
entity_id: number.heatbooster_zolderkamer_sander_ambientcontrol_temp
data:
value: >-
{{ state_attr('climate.smart_radiator_thermostat_x', 'temperature') |
float(0) }}
mode: single

unkempt sage Feb 2, 2026, 11:55 AM

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In dev tools you use: number.heatbooster_zolderkamer_sander_ambientcontrol_temp
In the automation: number.heatbooster_slaapkamer_achter_ambientcontrol_temp

dim scarab Feb 2, 2026, 11:55 AM

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sorry

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Damnn, indeed

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yess it works now!

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it syncs!

unkempt sage Feb 2, 2026, 11:56 AM

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🎉

rugged yew Feb 2, 2026, 11:58 AM

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Woo

dim scarab Feb 2, 2026, 11:59 AM

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thanks both!!

Amazing what this system can do!

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quite new to it but it seems amazing!

rugged yew Feb 2, 2026, 11:59 AM

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Yup. It's pretty powerful 🙂

dim scarab Feb 2, 2026, 12:00 PM

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yeahh

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Ohkee got it working for all boosters now!

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thanks again, ill close the ticket

#Automation write temperature question