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ive been doing it by unscrewing the valve i n the second picture above (#52) on each downstairs radiator and open the bleed valves to speed it up, then to backfill ive been using the same valve on the radiator closest to the backdoor.

yes thats my mains feed into the house but the valve above is that the drain valve i should be using to drain the system down or would that empty everything include the immersion cylinder ?? im basically at a loss now seem to be going round in circles. Would it make any difference if i...

So came home after work, no air or water in any radiators, so did the backfill as in #50 Johntheo said, blocked off fent pipe with hand Some gurgling but still the same result no air or water in rads. Can someone tell me please if this is my actual drain valve for the system (didn't even know...

How can i backfill if the bleed valves are open, wont the water just spray out of them all? or do you mean one at a time as its backfilling and should i only open the tap a little and not full

ill do that then, so once water starts coming out of the vent, i block it with my hand to force pressure back down?

Yes thats right, the water level was just below the outlet and the rust / sludge was all settled down there BUT i think when i first originally drained the tank i could have disturbed all the sludge during the re fill when i untied the ballcock, that would have been about Wednesday (3rd April)

Thanks I think it maybe an air lock then as all valves as far as I know are open (all the ones I've touched are open)

I think I've been getting the operation wrong, i thought backfilling comes up through the outlet and not the vent? so what is the purpose of the vent, if backfilling does it go through the air separator? if not then their is not much point in bothering doing it as i thought it might dislodge or...

Well back to square one, no water getting to upstairs radiators, although the downstairs ones did fill although not all of them, ive drained the downstairs ones again, header tank still full (valve closed and ballcock strung up) if it does slowly drain down again ill go for the back fill...

is that the small grey box above my pump its hard to see as its quite tight in my cupboard? "When system is filled ,manually unlatch the valve." which setting do you move it to? and when you say manually do you mean backfilling it? Sorry for been a complete novice.

cheers ill give that a go next, at least ive managed to clean the F&E tank out so its not full of sludge etc

Thanks ill let it fill up and see if i can get water into the upstairs rads and yes sorry i meant the outlet

no they are bled but the tank was empty / below the intake, thats why im wondering whether to refill and test or should i do anything else before that.

ok got home bled another downstairs rad and air came out again and gurgling / water running, it filled and then produced water out of bleed valve, been up in loft to F&E tank it was down below intake so ive got all the remaining water out and sludge / rust / gunk and cleaned it all up, tank is...

i doubt they will be as i have the fill valve for the F&E tank closed

Yes im going to do that again tonight after work (hopefully ) i can empty the header tank and make sure any excess sludge at the bottom is cleared before i put more water into it.

Little update, this morning before work i opened the bleed valves on the 2 furthest radiators downstairs both had lots of air in them and then suddenly lots of gurgling noises and water started flowing into the rads, both then had steady streams of water coming out of the bleed valves. I had to...

Well that's a job for the Pro's, what sort of damage would i be looking at roughly would you say.

hope these are ok