Updated version of https://gist.github.com/jamesridgway/a8cb01396601ebb7388060270f59d18e which switches fan off

ensuite_lights_off.yaml

alias: Ensuite Lights Off
description: ""
mode: single
trigger:
  - platform: mqtt
    topic: "shellies/shellyix3-FE9DE4D4101F/input/0"
condition:
  - condition: template
    value_template: "{{ trigger.payload == '0' }}"
  - condition: device
    type: is_on
    device_id: ef6cf6ec2c2b11600fb6ff99671434f7
    entity_id: light.ensuite_window
    domain: light
action:
  - service: light.turn_off
    target:
      entity_id:
        - light.ensuite_window
        - light.ensuite_shower
  - service: switch.turn_off
    target:
      entity_id: switch.ensuite_bathroom_fan_switch