New washing machine pipe - no water

Please help, I have two kids and a lot of laundry to do this weekend and no idea about plumbing.

Context - We moved our washing machine recently and a plumber came to plumb in pipes and a waste outlet for it. Problem is no water is coming through the new water supply.

The pipe that it spurs off from links to the combi boiler and when I open that, water runs through to pressurise it, but even though the white pipe is before that in the sequence, no water is running through it.

There seems to be further valves on that pipe that can be twisted, I've tried twisting all of those but still nothing. Is there something I need to do to this pipe to open it and let the supply through?

Update - sorted now, thank you so much for the advice, ye are all legends