EWC Controls Forum

I am new home owner and have EWC ST 3D panel as attached.

Zone 1 - master and on first floor
Zone 2 & 3- are on 2nd floor

Problem- whenever heating starts on first floor it starts to heat on zone 2 and 3( 2nd floor)automatically. I have tried reducing the temperature for zone 2 & 3 but didn’t help ...