After a restart or after an update, the temperature goes up to 25 degrees?
And you don’t want the temperature to go to 25, but you want it to stay at 19?
About the flow:
the card in your printscreen is ‘the energy has changed’. This is Homey energy usage. Why don’t you use Homey has started under system? (Homey a commence in French i think)
Another option is to save the 19 degrees in a tag: