From 2012, ecoTECs have four rectangular buttons and no dials.
- Press the button under the radiator symbol.
- Set the flow temperature with + and −.
- Press OK.
- Press back once to return to the home screen.
Video
Look up your exact model on Boiler Manuals if the fascia does not match. Then return to the Vaillant flow-temperature page or the Boiler Optimiser.