Hi, I understand that this is a very bad situation with the W600.
I use such automation for E1 and W600 works great, maybe it will be useful for you. Automation 2.0, lesson 14, creating automations for controlling groups of rooms using radiator thermostats (E1,W600) and a controlled heating boiler
___ Automation 2.0, lesson 17, mini topic of temperature control systems in one room (answers to forum questions)