Brink flair integration with homeassistant (https://community.home-assistant.io/t/integrating-brink-flair-325-hrv-with-home-assistant/333317)

automations.yaml

- alias: "Set ventilation Mode Selector"
  trigger:
    platform: mqtt
    topic: "ventilation/mode"
    # entity_id: input_select.ventilation_mode
  action:
    service: input_select.select_option
    target:
      entity_id: input_select.ventilation_mode
    data:
      option: "{{ trigger.payload }}"

- alias: "Set Ventilation Mode"
  trigger:
    platform: state
    entity_id: input_select.ventilation_mode
  action:
    service: mqtt.publish
    data:
      topic: "ventilation/mode"
      retain: true
      payload: "{{ states('input_select.ventilation_mode') }}"

- alias: "Set ventilation Bypass Mode Selector"
  trigger:
    platform: mqtt
    topic: "ventilation/bypass_mode"
  action:
    service: input_select.select_option
    target:
      entity_id: input_select.ventilation_bypass_mode
    data:
      option: "{{ trigger.payload }}"

- alias: Set Ventilation Bypass Mode
  description: If the flow speed is too high, bypass won't be manipulated due to the
    bad design of the HRV (there is "flapping" / "turbulence" that damages the bypass
    valve) - the bypass can be broken.
  trigger:
  - platform: state
    entity_id: input_select.ventilation_bypass_mode
  action:
  - service: mqtt.publish
    data:
      topic: ventilation/bypass_mode
      retain: true
      payload: '{{ states(''input_select.ventilation_bypass_mode'') }}'
  - if:
    - condition: numeric_state
      entity_id: sensor.ventilation_flow_speed
      below: '230'
    then:
    - service: mqtt.publish
      data:
        topic: ventilation/bypass_mode
        retain: true
        payload: '{{ states(''input_select.ventilation_bypass_mode'') }}'
    else:
    - service: notify.persistent_notification
      data:
        title: Not manipulating bypass due to too high flow speed.
        message: If you want to manipulate the bypass, you have to first lower the
          speed.
- alias: Reset ventilation publish filters after HA start
  description: >-
    Activates reset node in Nodered to force-publish all values again on the next
    tik
  trigger:
    - platform: homeassistant
      event: start
  action:
    - delay:
        hours: 0
        minutes: 1
        seconds: 0
        milliseconds: 0
    - service: mqtt.publish
      data:
        topic: ventilation/_reset_publish_filters
  initial_state: 'on'
  mode: single
- alias: Increase ventilation mode to max speed for brief period
  description: 'mostly for UI'
  trigger: null
  condition: []
  action:
    - variables:
        original_mode: '{{ states(''input_select.ventilation_mode'') }}'
    - service: input_select.select_option
      data:
        option: max
      target:
        entity_id: input_select.ventilation_mode
    - delay:
        hours: 0
        minutes: 20
        seconds: 0
        milliseconds: 0
    - service: input_select.select_option
      target:
        entity_id: input_select.ventilation_mode
      data:
        option: '{{ original_mode }}'
  mode: restart
- alias: Decrease ventilation mode for N minutes
  description: 'mostly for UI'
  trigger: null
  action:
    - variables:
        original_mode: '{{ states(''input_select.ventilation_mode'') }}'
    - service: input_select.select_option
      data:
        option: low
      target:
        entity_id: input_select.ventilation_mode
    - delay:
        hours: 0
        minutes: 30
        seconds: 0
        milliseconds: 0
    - service: input_select.select_option
      target:
        entity_id: input_select.ventilation_mode
      data:
        option: '{{ original_mode }}'
  mode: restart

configuration.yaml

mqtt:
  sensor:
  - unique_id: "ventilation/supply_temperature"
    name: "Ventilation Supply Temperature"
    state_topic: "ventilation/supply_temperature"
    unit_of_measurement: "°C"
    value_template: "{{ value }}"
  - unique_id: "ventilation/output_temperature"
    name: "Ventilation Output Temperature"
    state_topic: "ventilation/output_temperature"
    unit_of_measurement: "°C"
    value_template: "{{ value }}"
  - unique_id: "ventilation/outside_temperature"
    name: "Ventilation Outside Temperature"
    state_topic: "ventilation/outside_temperature"
    unit_of_measurement: "°C"
    value_template: "{{ value }}"
  - unique_id: "ventilation/supply_humidity"
    name: "Ventilation Supply Humidity"
    state_topic: "ventilation/supply_humidity"
    unit_of_measurement: "%"
    value_template: "{{ value }}"
  - unique_id: "ventilation/output_humidity"
    name: "Ventilation Output Humidity"
    state_topic: "ventilation/output_humidity"
    unit_of_measurement: "%"
    value_template: "{{ value }}"
  - unique_id: "ventilation/flow_speed"
    name: "Ventilation Flow Speed"
    state_topic: "ventilation/flow_speed"
    unit_of_measurement: "m3"
    value_template: "{{ value }}"
  - unique_id: "ventilation/flow_speed_pct"
    name: "Ventilation Flow Speed Percentages"
    state_topic: "ventilation/flow_speed_pct"
    unit_of_measurement: "%"
    value_template: "{{ value }}"
  - unique_id: "ventilation/bypass_state"
    name: "Ventilation Bypass State"
    state_topic: "ventilation/bypass_state"
    value_template: "{{ value }}"
  - unique_id: "ventilation/preheater_state"
    name: "Ventilation Preheater State"
    state_topic: "ventilation/preheater_state"
    value_template: "{{ value }}"
  - unique_id: "ventilation/preheater_output"
    unit_of_measurement: "%"
    name: "Ventilation Preheater Output"
    state_topic: "ventilation/preheater_output"
    value_template: "{{ value }}"
  - unique_id: "ventilation/filter_state"
    name: "Ventilation Filter Status"
    state_topic: "ventilation/filter_state"
    value_template: "{{ value }}"
  - unique_id: "ventilation/output_pressure"
    name: "Ventilation Pressure Output"
    state_topic: "ventilation/output_pressure"
    unit_of_measurement: "pa"
  - unique_id: "ventilation/input_pressure"
    name: "Ventilation Pressure Input"
    state_topic: "ventilation/input_pressure"
    unit_of_measurement: "pa"
  - unique_id: "ventilation/filter_usage"
    name: "Filter Usage in Hours"
    state_topic: "ventilation/filter_usage"
    unit_of_measurement: "h"
    value_template: "{{ value }}"

flow-400.json

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states","rules":[{"t":"change","p":"payload[0]","pt":"msg","from":"0","fromt":"num","to":"initializing","tot":"str"},{"t":"change","p":"payload[0]","pt":"msg","from":"1","fromt":"num","to":"inactive","tot":"str"},{"t":"change","p":"payload[0]","pt":"msg","from":"2","fromt":"num","to":"active","tot":"str"},{"t":"change","p":"payload[0]","pt":"msg","from":"3","fromt":"num","to":"testing","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":380,"y":560,"wires":[["fc45823424d6faad"]],"info":"      - \"initializing\"\n      - \"inactive\"\n      - \"active\"\n      - \"testing\""},{"id":"fc45823424d6faad","type":"change","z":"61755636.844f88","name":"Set mode","rules":[{"t":"set","p":"payload","pt":"msg","to":"msg.payload[0]","tot":"jsonata"}],"action":"","property":"","from":"","to":"","reg":false,"x":560,"y":560,"wires":[["1629f29cf4d559e4"]],"info":"just to get the number from the list"},{"id":"71e8d73961a3efa7","type":"debug","z":"61755636.844f88","name":"Filters reseted debug","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","statusVal":"","statusType":"auto","x":850,"y":1320,"wires":[]},{"id":"5bdc16e47edcc568","type":"modbus-read","z":"61755636.844f88","name":"Modbus Status","topic":"","showStatusActivities":false,"logIOActivities":false,"showErrors":false,"unitid":"20","dataType":"HoldingRegister","adr":"8000","quantity":"1","rate":"3","rateUnit":"m","delayOnStart":true,"startDelayTime":"2","server":"9270f483.3edde8","useIOFile":false,"ioFile":"","useIOForPayload":false,"emptyMsgOnFail":false,"x":160,"y":1680,"wires":[["522da098473b29d6"],[]],"info":"0: inicializovat / 1: otevřený /\n2: zavřený / 3: otevřený / 4:\nzavřený / 255: chyba"},{"id":"522da098473b29d6","type":"switch","z":"61755636.844f88","name":"Only transmit if modbus is 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value;\nreturn msg","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":420,"y":240,"wires":[["3576006b8d8316c2"]],"info":"It seems that negative values are being sent as positive integers starting at 2^16 (Uint16)."},{"id":"c7d65aa01f1fb8a0","type":"function","z":"61755636.844f88","name":"raw2temp","func":"var orig_value = msg.payload.data[0];\n\nconst INT_SIZE = 65536;\nconst NEGATIVE_THRESHOLD = 60000;\n\nvar value = orig_value\n// if the number is bigger than NEGATIVE_THRESHOLD\n// substract it from INT_SIZE with negative sign\nif (orig_value > NEGATIVE_THRESHOLD) {\n    value = orig_value - INT_SIZE\n}\nvalue = value / 10;\n\nmsg.payload = value;\nreturn msg","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":420,"y":100,"wires":[["bb6afff892e70a66"]],"info":"It seems that negative values are being sent as positive integers starting at 2^16 (Uint16)."},{"id":"92de04b2d01a9ca2","type":"function","z":"61755636.844f88","name":"raw2temp","func":"var 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lovelace-view.yaml

  - title: ventilation
    path: ventilation
    badges: []
    cards:
      - type: horizontal-stack
        title: Set ventilation speed
        cards:
          - type: custom:button-card
            styles:
              card:
                - height: 200px
            icon: mdi:fan-off
            size: 100%
            show_state: true
            name: low
            state:
              - operator: template
                value: |
                  [[[
                    return states['input_select.ventilation_mode'].state == "low"
                  ]]]
                color: green
              - operator: default
            tap_action:
              action: call-service
              service: input_select.select_option
              service_data:
                option: low
                entity_id: input_select.ventilation_mode
          - type: custom:button-card
            name: medium
            styles:
              card:
                - height: 200px
            icon: mdi:fan-speed-1
            size: 100%
            show_state: true
            state:
              - operator: template
                value: |
                  [[[
                    return states['input_select.ventilation_mode'].state == "medium"
                  ]]]
                color: green
              - operator: default
            tap_action:
              action: call-service
              service: input_select.select_option
              service_data:
                option: medium
                entity_id: input_select.ventilation_mode
          - type: custom:button-card
            styles:
              card:
                - height: 200px
            icon: mdi:fan-speed-2
            name: high
            size: 100%
            show_state: true
            state:
              - operator: template
                value: |
                  [[[
                    return states['input_select.ventilation_mode'].state == "high"
                  ]]]
                color: green
              - operator: default
            tap_action:
              action: call-service
              service: input_select.select_option
              service_data:
                option: high
                entity_id: input_select.ventilation_mode
          - type: custom:button-card
            styles:
              card:
                - height: 200px
            icon: mdi:fan-speed-3
            name: max
            size: 100%
            show_state: true
            state:
              - operator: template
                value: |
                  [[[
                    return states['input_select.ventilation_mode'].state == "max"
                  ]]]
                color: green
              - operator: default
            tap_action:
              action: call-service
              service: input_select.select_option
              service_data:
                option: max
                entity_id: input_select.ventilation_mode
      - type: entities
        entities:
          - entity: input_select.ventilation_bypass_mode
      - type: entities
        entities:
          - entity: sensor.ventilation_bypass_state
          - entity: sensor.ventilation_flow_speed
          - entity: sensor.ventilation_flow_speed_percentages
          - entity: sensor.ventilation_outside_temperature
          - entity: sensor.ventilation_supply_humidity
          - entity: sensor.ventilation_supply_temperature
          - entity: sensor.ventilation_output_humidity
          - entity: sensor.ventilation_output_temperature
      - type: horizontal-stack
        title: Override vent for 30 mins
        cards:
          - type: custom:button-card
            styles:
              card:
                - height: 200px
            icon: mdi:fan-chevron-down
            size: 100%
            show_state: true
            show_label: true
            label: |
              [[[
                return 'Low speed ' + ((states['input_select.ventilation_mode'].state == 'low') ? 'activated' : 'deactivated');
              ]]]
            state:
              - operator: template
                value: |
                  [[[
                    return states['input_select.ventilation_mode'].state == "low"
                  ]]]
                color: green
              - operator: default
                color: black
            tap_action:
              action: call-service
              service: automation.trigger
              service_data:
                entity_id: automation.decrease_ventilation_mode_for_n_minutes
          - type: custom:button-card
            icon: mdi:fan-chevron-up
            size: 100%
            styles:
              card:
                - height: 200px
            show_state: true
            show_label: true
            label: |
              [[[
                return 'Max speed ' + ((states['input_select.ventilation_mode'].state == 'max') ? 'activated' : 'deactivated');
              ]]]
            state:
              - operator: template
                value: |
                  [[[
                    return states['input_select.ventilation_mode'].state == "max"
                  ]]]
                color: green
              - operator: default
            tap_action:
              action: call-service
              service: automation.trigger
              service_data:
                entity_id: >-
                  automation.increase_ventilation_mode_to_max_speed_for_brief_period
      - type: button
        name: Push state
        icon: mdi:publish
        show_state: false
        tap_action:
          action: call-service
          service: mqtt.publish
          service_data:
            topic: ventilation/_reset_publish_filters

Reading 7990 doesn't do anything for me, no return value.

7990 is 1 for me.
it has been awhile since I looked at this and the symptom is so familiar.
Do you ever set the mode to 0? (Via app or home assistant). Basically i disabled every chance of setting to 0 with home assistant. And don’t make change to 0 via the web-app.

and a final protection - I added a power plug that I can remotely switch off and on in case I forget to turn it down when using the rf sender or if something goes wrong. This way I can switch it off and on then all is reset. :)

And to add - set it to 1 on modbus, web app and rf senders if you have it. Then test from there. 🤞🏻

Yes! @garystewart that was it. Changed the state to 1 in the local interface, and now it's working again. Thank you so much!

your welcome. it drove me crazy. Basically, highest setting wins except mode=0. which I think is some sort of vacation setting which in imho should never be used.
If you have the 4 button cabled switch the ventilator sign is mode 0. In the end I removed the cabled switch and replaced it with the rf sender one. so now nothing can set to 0 in my house :-)