Vaillant Pro 24 with only one tap on filling loop

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Sorry new to the forum but figured it out now I think! Can you see the pics now?
 
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Yep can see it now! OK the black tap you see, what happens when you turn that verticle? Can you hear water filling your boiler? Keep an eye on the pressure gauge, it should start rising.

If you turn the tap and nothing happens, there may be an isolation valve on the other end off the filling loop. The little hex on that end is part of a check valve. But a bit further up, behind that pipe, can you see a slotted isolator valve, or something which looks like it may have had a plastic handle fitted to it?? if their is one there, its been poorly installed. If it is, get a pair of thin pliers and turn that until you hear water fill the system. let me know how you get on mate
 
Thanks for your reply.

It doesn't go vertical but moves slightly anti clockwise. I have done that and although I can hear a faint watery noise it's not a whoosh like I'd expect and the pressure isn't increasing. I can't find anything that could be turned other than the hexi thing. Any other thoughts?!
 
That black tap handle looks old so it may have seized up. Try turning it using an adjustable spanner. Or better still, remove the small screw holding it onto the valve, and take of the black handle. Dont worry no water will leak out. They use a small adjustable spanner of grip the small brass area now visible and turn the valve. Try both ways, left and right, one way will open it. If water is only trickling though, not a problem, keep watching the pressure gauge, may take a few mins to get pressure up.

Whats gauge showing at the moment? If it requires a lot of water, the gauge wont move much for a while. Also as water enters the system, bleed upstairs radiators of air, then come back, and repeat.....bit long winded, but its the only way!
 
That sounds great, thank you! Should I have the heating off while doing this? Sorry complete novice here!
 
Yes best to turn the heating off whilst you do this. Each time you bleed air out of radiators, the pressure will fall again, so keep topping up, and dont let pressure go above 1.5 bar.
 
All the radiators are full and didn't need bleeding. The pressure has gone up almost midway in the grey bit and stopped there for a long time. Should that be enough?
 
D

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