Question about MQTT Switch

@ncortines wrote:

Hi,

I have a Generic Thermostat that triggers a MQTT Switch to open/close the valve of a water heater:

- platform: mqtt
  name: "heater_bedroom"
  state_topic: "bedroom/relay/state"
  command_topic: "bedroom/relay/set"
  payload_on: 1
  payload_off: 0
  state_on: "1"
  state_off: "0"
  retain: true

- platform: generic_thermostat
  name: thermostat_bedroom
  heater: switch.heater_bedroom
  target_sensor: sensor.temperature_xiaomi_air_1
  min_temp: 16
  max_temp: 26
  ac_mode: False
  target_temp: 20.5
  cold_tolerance: 0.1
  hot_tolerance: 0.1
  min_cycle_duration:
    seconds: 5
  keep_alive:
    minutes: 3
  initial_operation_mode: "auto"
  away_temp: 16

I also have an automation that triggers the central heating boiler whenever 1 or more heater switches are open:

- id: enable_boiler
  alias: Enable Boiler
  trigger:
    - platform: state
      entity_id:
        - group.all_heaters
      to: 'on'
      from: 'off'
  action:
    - service: switch.turn_on
      data:
        entity_id:
          - switch.boiler

This configuration works pretty well (I’ve been using it for the whole season without glitches) until, for whatever the reason, one of the heater’s MQTT Switches disconnects.

If one of the heater’s MQTT Switches disconnects while the State was “ON”, it remains “ON”, and my Boiler keeps heating even though the heater’s MQTT Switch now is closed, because those are Normally Closed valves.

So basically, the ideal solution for me would be a MQTT Switch that changes state to “OFF” when the connection to the client is lost.

What could be a solution for my problem?

Thanks!
Juan

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