This fascia is a round button cluster with a display in the middle and a pressure gauge off to the right. The radiator key turns heating on and sets the maximum flow.
- Press the radiator key (heating). The display shows the current maximum flow temperature.
- Press the up or down keys until the display shows the flow you want, typically around 55°C if the house still warms.
- Wait two seconds. The setting saves itself — you should see a tick, then the home screen.
Look up your exact model on Boiler Manuals if the fascia does not match. Then return to the Worcester Bosch flow-temperature page or the Boiler Optimiser.