Home Assistant integration - desired temperature always 0.0 - prevent cycling and maximazing use of solar power at daytime

[mgiesl2s]

I would like to run my Vaillant Arotherm Plus heat pump during the day and prevent it from cycling during the day in order to use as much solar power as possible directly.

I thought about raising the target temperature by 0.5 degrees as an automation in Home Assistant when the power consumption in watts is in a certain range. In my case, 400 - 600 watts of power consumption. This way I can always ensure that the heat pump always runs above 600 watts of power consumption. At 500 watts, my Arotherm Plus VWL75 stops working and then cycles.

I then created an automation that does exactly that. Unfortunately, I had a bug in the calculation, so that an incorrect data type (string) was transmitted to the heat pump instead of a float. From this point on (I assume) the temperature is always be shown as 0.0 degrees in the home assistant for the desired temperature and I am no longer be able to use an automation that reads the correct desired temperature sensor and can add +0.5 degrees to it. You can find my automation below.

alias: Vaillant Wärmepumpe
description: ""
trigger:

• type: value
  platform: device
  device_id: e08f46858029f347b7ced4dd96d07898
  entity_id: c7d0148aa488401c7f59744792ad0c65
  domain: sensor
  above: 400
  for:
  hours: 0
  minutes: 0
  seconds: 10
  below: 600
  condition: []
  action:
• service: notify.mobile_app_sm_a127f
  metadata: {}
  data:
  message: >-
  Leistungsaufnahme Wärmepumpe:
  {{states('sensor.my_home_device_0_arotherm_plus_current_power')}} Watt
  Wunschtemperatur von
  {{states('sensor.my_home_zone_1_circuit_0_desired_temperature')}} grad
  auf {% set state =
  states('sensor.my_home_zone_1_circuit_0_desired_temperature') %}{{ state
  | float + 0.5 if not
  is_state('sensor.my_home_zone_1_circuit_0_desired_temperature', '0.0')
  else '10.0'}} grad angehoben
  title: Wunschtemperatur angehoben
• service: climate.set_temperature
  metadata: {}
  data:
  temperature: >-
  {% set state =
  states('sensor.my_home_zone_1_circuit_0_desired_temperature') %}{{ state
  | float + 0.5 if not
  is_state('sensor.my_home_zone_1_circuit_0_desired_temperature', '0.0')
  else '19.0'}}
  target:
  device_id: 014bca7e1a70118312e884169accbb1f
  entity_id: climate.my_home_zone_1_circuit_0_climate
  enabled: true

Is this a bug in the home assistant componant/integration that the desired temperatur is always 0.0 degree? In my vaillant app i see another desired temperature.