Trying to fix low pressure problem with boiler

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Hi, I'm trying to top up the pressure on my Vaillant combiboiler (Ecotec Pro 28).

I've watched a few videos and I think I know which pipes to connect with the filling loop, but I'm not sure. I tried and the pressure didn't rise, although I don't think I heard water flowing like in the videos.

The pipe which the water comes out of when I turn the tap is labelled as "C H flow" with an "out" arrow, and the water smells and is hot. Is this the right pipe?

I connected it to the "cold water mains / cylinder return" which has an arrow pointing in.

Any advice would be helpful. Thank you!
 
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You are doing something wrong ,hot water shouldn't be coming out when using a filling loop. Post pics of what you are trying.And below the boiler.
 
You are doing something wrong ,hot water shouldn't be coming out when using a filling loop. Post pics of what you are trying.And below the boiler.

Here are the pipes

1.JPG 2.JPG IMG_2799.JPG

the one on the far left is where the water came from, and I had it going into the 4th one along.
 

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Last edited:
This is what I was trying
 

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Yes that connection is correct. Does the valve on the 4th pipe ( cold mains) have a lever like the one on the left ? Both valves need to be open for water to flow into the boiler. I can't see the one on the right very well in pic.
 
Yes that connection is correct. Does the valve on the 4th pipe ( cold mains) have a lever like the one on the left ? Both valves need to be open for water to flow into the boiler. I can't see the one on the right very well in pic.
It doesn't have a lever. Here are some better pics of it:
 

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Looks like the lever has broken off. Its the black plastic bit on the top ,with a screw ( cross head type) in the centre. If you have a set of grips to turn it 1/4 turn it should open the valve and water should flow. Connect the braided hose both ends first !
 
Looks like the lever has broken off. Its the black plastic bit on the top ,with a screw ( cross head type) in the centre. If you have a set of grips to turn it 1/4 turn it should open the valve and water should flow. Connect the braided hose both ends first !
Ah yeah, turned that one and it worked. Brilliant! Thanks so much for the help Terry.
 

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