1canhelp, can you tell me where it states that you CAN use 6mm2 earth on a gas installation please. i would like to forward that onto my assessor. obviously you know everything about everything so this shouldnt be too hard for you.
from a foot pump it shoulnt take many pumps to get the vessell up to 1 bar from flat, so its either your vessell or your pump which is knackard, if you completely remove the vessell and then pump it you will soon see.
The valve in front of your cylinder is a bypass valve, its looks like your system is a 'y plan' so providing you have atleast 1 rad with no trv this should remain closed.
You may want to jump in the loft to check your f&e tank (the small one) to make sure its full, you may have a stuck ball...
Right the pump is actually under the floor boards, that picture is a bit confusing!!! on the zone valve there is a little lever on 1 side when the heating is on can you move the lever with no resistance?? (checking to see if valve is opening)
You should really KNOW that is right,
Ok - convert to sealed system
move pump onto boiler flow
bypass after pump but before zone valve to return pipework
get rid of all those gate valves or at least remove the tops
That'll do to start.........
There should be enough pressure if the tank is in the loft, are you using the original cold feed as it may have a blockage,
Where does the cold feed enter the system and where does the vent come off the system??? this is important,
There are many issues with this system an you really...