z2m_aqara_trv_external_temperature.yaml

z2m_aqara_trv_external_temperature.yaml

blueprint:
  name: Aqara TRV E1 External Temperature Control
  description: >
    This automation allows the Aqara TRV E1 Smart Radiator Thermostat to use temperature readings from an external sensor rather than its internal sensor. Whenever the temperature sensor reports a new value, it is sent to the TRV for more accurate climate control.
  domain: automation
  source_url: "https://gist.github.com/pavax/8d6ed250765d89cb281d4a1762b8d2e8"

  input:
    external_temp_sensor:
      name: External Temperature Sensor
      description: Select the temperature sensor that will provide temperature readings to the Aqara TRV.
      selector:
        entity:
          filter:
            domain: sensor
            device_class:
              - temperature

    aqara_trv_device:
      name: Aqara TRV Device
      description: Select the Aqara Smart Radiator Thermostat E1 that will receive the external temperature data.
      selector:
        device:
          multiple: false
          filter:
            - integration: mqtt
              manufacturer: Aqara
              model: Smart radiator thermostat E1 (SRTS-A01)
            - integration: mqtt
              manufacturer: Aqara
              model: Smart radiator thermostat E1
            - integration: mqtt
              manufacturer: Aqara
              model: Aqara Smart Radiator thermostat E1 (SRTS-A01)
            - integration: mqtt
              manufacturer: Aqara
              model: Aqara smart radiator thermostat E1 (SRTS-A01)

    external_temperature_input_name:
      name: TRV's Input Sensor Name
      description: Enter a keyword or name used to identify the TRV’s number sensor entity-id, which sets the external temperature value. Defaults to 'external'.
      selector:
        text:
      default: "external"

mode: single
max_exceeded: silent

variables:
  aqara_trv_device: !input aqara_trv_device
  external_temp_sensor: !input external_temp_sensor
  external_temperature_input_name: !input external_temperature_input_name

trigger:
  - trigger: state
    entity_id: !input external_temp_sensor

action:
  - variables:
      aqara_trv_device_name: "{{ device_attr(aqara_trv_device, 'name') }}"
      aqara_trv_select_entity: >-
        {% set device_entities = device_entities(aqara_trv_device) %}
        {{ expand(states['select'])   
                  | selectattr('entity_id','in', device_entities)
                  | selectattr('attributes.options', 'contains', 'external')
                  | map(attribute='entity_id') 
                  | first
        }}
      aqara_trv_number_entity: >-
        {% set device_entities = device_entities(aqara_trv_device) %}
        {{ expand(states['number'])   
                  | selectattr('entity_id','in', device_entities)
                  | selectattr('entity_id', 'contains', external_temperature_input_name)
                  | map(attribute='entity_id') 
                  | first
        }}

  - if:
      - condition: template
        value_template: >-
          {{ is_state(external_temp_sensor, "unavailable") or is_state(external_temp_sensor, "unknown") }}
    then:
      - action: select.select_option
        target:
          entity_id: "{{aqara_trv_select_entity}}"
        data:
          option: internal
      - action: system_log.write
        data:
          level: error
          message: External temperature sensor unavailable
          logger: Aqara TRV
      - stop: External temperature sensor unavailable

  - if:
      - condition: template
        value_template: "{{ not is_state(aqara_trv_select_entity, 'external')}}"
    then:
      - action: select.select_option
        target:
          entity_id: "{{aqara_trv_select_entity}}"
        data:
          option: external
      - delay:
          hours: 0
          minutes: 0
          seconds: 10
          milliseconds: 0

  - action: number.set_value
    data:
      value: >-
        {{ (states(external_temp_sensor)|float(0)|round(1)) }}
    target:
      entity_id: "{{aqara_trv_number_entity}}"

In the Zigbee2MQTT UI, I can see that my TRV exposes an external temperature input:

what kind/model of trv do you have? aqara e1?

Yes, that's the model this blueprint is for.

I tried the Blueprint instead of Better Thermostat because I don't like the way it works—for example, if I set the desired temperature to 22 degrees, the thermostat sets itself to 30 degrees, and so on.

After two days, the sensor on my thermostats keeps switching to “internal” when using the Blueprint. If I switch it back to “external,” it jumps back to “internal” after five minutes. My temperature sensors aren’t temporarily “unavailable.”
I wrote the following addition using Claude. It seems to have been helping for a few hours now.

triggers:
  - trigger: state
    entity_id: sensor.og_buro_rabea_sensor_temperature
    not_to:
      - unavailable
      - unknown
  - trigger: mqtt
    topic: zigbee2mqtt/bridge/event
    value_template: "{{ value_json.data.friendly_name }}"
    payload: "OG_Thermostat Büro Rabea"