Refilling boiler, Piglet John or ancient boiler enthusiasts..

[tresleches]

I have looked at other threads about this and worked out some things based on them, but not how to resolve this. Worse, my plumber has been round twice recently about other things and I didn't take the opportunity to ask her.

Basically, my Ariston Micro Combi boiler has a refilling pipe but when I turn the knob, nothing happens. So I think this means I also need to turn something at the cold inlet? But I can't see another obvious key on other pipes. Candidates might be the one with a white bit (turned the white bit and nothing happened), or the big one with a screw that could be turned? White bit seems more promising but I can't see how to shift anything.

I will text my plumber tomorrow if I can't do it today, it's just freezing here in Scotland (actually frozen outside), so keen to have a decent go today. I never thought I'd miss the tractor noises of impending doom but here we are.

Sorry I meant to @pigletjohn in that as per instructions in previous threads!

You see the brass fittings with what looks like (it isn't) a screw head sticking out of them?

Those are ball valves. When the slot is parallel to the pipe, it is open. When it is turned across the pipe, it is closed. Only ever use a flat tip screwdriver of the correct size, not a knife or nail file. Brass is a soft metal and easily damaged.

Thanks for your reply - so the ball valve on the far right side is the cold water inlet?

Wait, I think I just deduced you mean it's the one second to right as it's the only one not open!

I couldn't see the slot

There are usually two valves on a filling pipe, as it is so important water must not flow through even if one fails. You have to open both (and close both afterwards)