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Air. Turn off the hot ones and as the others heat up turn them off until you get the last one going, you can then turn them back on, let them get properly hot, before turning off.

I've not read this whole thread but try Tracking along as much of the pipe, as you can, with a magnet, if it sticks to the pipe there is magnetite in it which will reduce or stop circulation.

Have you tried pliers or small adjustable spanner on the bleed key for extra purchase?

Does it screw straight into the rad or into a bush/plug?

Can you post a pic?

Depends on your system and boiler, but my crystal ball needs a new battery!

Cut it off the other end and move it along a bit :mrgreen:

System pressure!

I suspect the flue bits to do as you want are available, however, whether the manufacturer would approve of it being outdoors is another matter.

Can you post a picture of the pump, motorised valve(s) and the pipework around that area.

you could try draining and refilling, but that often entrains more air. find the cold feed connection and cut it out.

rip off.........£149.98 is more realistic :mrgreen:

looks like sooey got it right, if you feel competent to clear the cold feed do so, if not call a pro.

Try refittin the prog and then turn on the CH only, (set to fully pumped on back of prog) see if it works

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Sounds like you need a new receiver.

You should have put an air release on the pipe at the 3port valve. As it is the easiest way to bleed it is to loosen one of the compression joints, probably on the gate valve, and catch the water in a tub.

Or ball valve stuck!

check for mains power on the white wire to the valve, when there is a call for heating .

Got any pics of the new pipework setup?