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Viessmann ZK03840 #

Model	ZK03840
Vendor	Viessmann
Description	ViCare radiator thermostat valve
Supports	thermostat
Picture

Notes #

Installing the TRV #

• install the correct adaptor on the valve
• open cover (push clip on bottom and push front side to slide open)
• insert batteries (-- should be on the display)
• press the button on the top (-- + ((•)) should be on the display)
• wait for the device to pair, it took about 2 minutes for me to get the success message in Zigbee2MQTT
• install the TRV on the adaptor (push hard until you feel a click, rotate the TRV until display faces up)
• press the button on the top for 3 seconds (motor will turn, 21° + ((•)) should be on the display)
• close the cover

Manual Home Assistant configuration #

Although Home Assistant integration through MQTT discovery is preferred, manual integration is possible with the following configuration:

climate:
  - platform: "mqtt"
    availability_topic: "zigbee2mqtt/bridge/state"
    temperature_unit: "C"
    min_temp: "7"
    max_temp: "30"
    mode_state_topic: true
    mode_state_template: "{{ value_json.system_mode }}"
    mode_command_topic: true
    current_temperature_topic: true
    current_temperature_template: "{{ value_json.local_temperature }}"
    temp_step: 1
    action_topic: true
    action_template: "{% set values = {'idle':'off','heat':'heating','cool':'cooling','fan only':'fan'} %}{{ values[value_json.running_state] }}"
    modes: 
      - "off"
      - "auto"
      - "heat"
    temperature_state_topic: true
    temperature_state_template: "{{ value_json.occupied_heating_setpoint }}"
    temperature_command_topic: "occupied_heating_setpoint"

sensor:
  - platform: "mqtt"
    state_topic: "zigbee2mqtt/<FRIENDLY_NAME>"
    availability_topic: "zigbee2mqtt/bridge/state"
    icon: "mdi:signal"
    unit_of_measurement: "lqi"
    value_template: "{{ value_json.linkquality }}"