Hi, I have a Worcester Greenstar 27i compact boiler which has 0 bar showing for pressure. I’ve tried to figure out where/how I can let more water in but am at a loss.

The boiler doesn’t seem to have a key/anywhere to insert it like in YouTube videos, and there is a black cap seemingly preventing me from turning the valve.

There are also no blue levers/anything to twist. There is a cylinder in the loft but can’t see anything up there to let more water in either.

Any help/ideas welcome.

Edit: link to additional photos of cylinder, what looks like filling loop (but opening valves doesn’t do anything) and other random exposed pipe work in attic: https://postimg.cc/gallery/tWP1gRF

Really weird one. It started in the summer when the outside cold tap was being run simultaneously with the hot water tap, a really loud noise followed by vibration of the pipes started.

It’s now progressed to where if the kitchen tap is, on the bathroom sink will now vibrate, make a noise when drop a little when it’s off. Now I’ve noticed when I push down the top of the tap, it helps to stop the noise a little.

The problem also happens when the bathtub hot water tap is turned on, but the sink is off.

Any ideas what is causing this, loose washer on the tap maybe or?

I’d asked a plumber to come round but he didn’t seem so sure so I’d like to try and fix it myself if I can.