Climate.set_fan_mode automation help

I am having issues with an automation to change the fan mode on my Fujitsu airconditioner. I am using a custom component (which works perfectly from the GUI here). Any pointers on why this one doesn’t work? It will work if I substitute climate.set_fan_mode with climate.turn_off and remove the fan_mode data.

  trigger:
    platform: time
    at: "20:50:00"
  action:
    - service: climate.set_fan_mode
      data:
        entity_id: climate.ac_uty_a0cc2b33cc15
        fan_mode: 'On Low'

I have also tried using the developer tools Services with json and it worked using that model.
{
“entity_id”: “climate.ac_uty_a0cc2b33cc15”, “fan_mode”: “low”
}

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If it works in the developer tools with ‘Low’, that is what you need to use in the automation. Fan speeds would normally be low, medium/mid, high, ‘On Low’ doesnt sound right.

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