hassio-conf/templates/kitchen.yaml

---
binary_sensor:
  - name: ki_fridge_door_sensor_contact_state
    state: "{{ states('binary_sensor.ki_fridge_door_sensor_contact') }}"
    device_class: door
    icon: >
      {% if states.binary_sensor.ki_fridge_door_sensor_contact.state is defined %}
      {% if is_state('binary_sensor.ki_fridge_door_sensor_contact', 'off') %}
        mdi:fridge-industrial
      {% else %}
        mdi:fridge-industrial-alert-outline
      {% endif %}
      {% endif %}