Filling Loop Leaking/Not Working

[cgfw201]

Noticed my boiler pressure was low (zero) yesterday. New house and it was ok when moved in, so presume there's a leak somewhere...

Anyway I've previously had no trouble on other boilers just turning the black taps to fill the system via the filling loop.

However, yesterday when I tried this, nothing happened. No noise, no water, no change in pressure.

I then gave the loop a wiggle and water started spurting out all over the place.

I tightened the nuts holding the loop on and the violent spurt became more of a dribble.

No change in pressure.

There's some metal screws that can be opened with a screwdriver, which I did and had no change in luck with.

Looks like the pic below...What should I be doing to get some pressure back?

Thanks!

 

[joni os]

Close off mains water stopcock and confirm by opening cold tap at kitchen sink. Remove flexible hose and open fill valve on boiler, catching water that emerges. Expect less than 1/2 bucket of water as sealed system creates vacuum. Crud from flexible will often block this valve but even with pressure gauge showing zero there is usually sufficient pressure in system to back flush and clear it. If no water emerges gently probe open valve. Inspect flexible, blow through to clear. This should allow you to reattach and pressure boiler, even with damaged flexible, prior to purchase of new hose.

 

[cgfw201]

Close off mains water stopcock and confirm by opening cold tap at kitchen sink. Remove flexible hose and open fill valve on boiler, catching water that emerges. Expect less than 1/2 bucket of water as sealed system creates vacuum. Crud from flexible will often block this valve but even with pressure gauge showing zero there is usually sufficient pressure in system to back flush and clear it. If no water emerges gently probe open valve. Inspect flexible, blow through to clear. This should allow you to reattach and pressure boiler, even with damaged flexible, prior to purchase of new hose.

Cant for the life of me locate where our stopcock is! Looked all round the house in the usual places and can’t find a sign of it.

All I’ve been able to do is detatch and reattach the right hand side of the filling loop.

With it off, when I turn on the left black tap, water runs at high pressure from the open end. When I reattach it I just get the leak again on the right hand side and no increase in boiler pressure.

I can’t loosen the left side due to where the nut is located and not having enough room to get an adjustable spanner onto it.

Getting a plumber out seems to be only real option.