AC Unit with additional Power command topic

[thomas41587]

The problem

I am trying to add my AC unit into Home Assistant.
I got everything working (temperature, fan, mode, swing). So I can set those in HA and my AC unit recognizes it and the other way round does also work.
BUT: My AC unit does have a "power" topic to set the device on/off. It does NOT have the "mode" "off". Instead you simply send "On"/"Off" to the "Power" topic and set the "mode" independently.
I cannot find a way to get that working as HA seems to treat any "mode" that is not "Off" as power=on. And also "Mode=off" seems to be the power off command. But this does not work with my unit :-(

What version of Home Assistant Core has the issue?

core-2024.12.4

What was the last working version of Home Assistant Core?

No response

What type of installation are you running?

Home Assistant OS

Integration causing the issue

mqtt

Link to integration documentation on our website

No response

Diagnostics information

No response

Example YAML snippet

mqtt:
  - climate:
      name: Schlafzimmer
      unique_id: schlafzimmer_klimaanlage
      availability: 
        topic: "MHI-AC-Ctrl-SZ/cmd_received"
        payload_available: "o.k."
      current_temperature_topic: "MHI-AC-Ctrl-SZ/Troom"
      device:
        manufacturer: "Mitsubishi"
        identifiers: "123schlafzimmer"
        suggested_area: "Schlafzimmer"
      modes:
        - "auto"
        - "heat"
        - "cool"
        - "dry"
        - "fan_only"
      swing_modes:
        - "1"
        - "2"
        - "3"
        - "4"
        - "Swing"
      fan_modes:
        - "1"
        - "2"
        - "3"
        - "4"
      power_command_topic: "MHI-AC-Ctrl-SZ/set/Power"
      power_command_template: >
        {% if value == 'on' %}On{% else %}Off{% endif %}
      payload_on: "On"
      payload_off: "Off"
      mode_command_topic: "MHI-AC-Ctrl-SZ/set/Mode"
      mode_command_template: >
        {% if value == "auto" %}Auto
        {% elif value == "dry" %}Dry
        {% elif value == "cool" %}Cool
        {% elif value == "fan_only" %}Fan
        {% elif value == "heat" %}Heat
        {% else %}Off{% endif %}
      mode_state_topic: "MHI-AC-Ctrl-SZ/Mode"
      mode_state_template: >
        {% if value == "Auto" %}auto
        {% elif value == "Dry" %}dry
        {% elif value == "Cool" %}cool
        {% elif value == "Fan" %}fan_only
        {% elif value == "Heat" %}heat
        {% else %}off{% endif %}
      temperature_command_topic: "MHI-AC-Ctrl-SZ/set/Tsetpoint"
      temperature_state_topic: "MHI-AC-Ctrl-SZ/Tsetpoint"
      fan_mode_command_topic: "MHI-AC-Ctrl-SZ/set/Fan"
      fan_mode_state_topic: "MHI-AC-Ctrl-SZ/Fan"
      swing_mode_command_topic: "MHI-AC-Ctrl-SZ/set/Vanes"
      swing_mode_state_topic: "MHI-AC-Ctrl-SZ/Vanes"
      precision: 1.0

Anything in the logs that might be useful for us?

No response

Additional information

No response

[home-assistant]

Hey there @emontnemery, @jbouwh, @bdraco, mind taking a look at this issue as it has been labeled with an integration (mqtt) you are listed as a code owner for? Thanks!

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