helpppppppppp.. cold radiators out of ideas

[casper 1]

Hi all please help

I have just rewired the full system into a honywell sundial wiring centre after having loads of trouble with no hot water / no heating ect it was very temperamental.
Now it’s rewired every thing is working ok i.e. the mid position valves the room thermostat ect...

The only problem is 2 of the 5 down stairs radiators are cold ive bleed them; ive also tried turning all the working radiators off. When I do this you can here water starting to run in the 2 cold ones but they still don’t get warm. Any ideas much appreciated thanks

Y plan heating vented

 

[oilman]

Turn off all but one rad, turn off hot water, turn pump to max speed. Repeat for other rad.

 

[bab]

Hi Mate Did u drain the system to fit the new 3 port valve .Water will always go its easyest route. can you set the system to heating only thus removing the hot water clyinder from the problem. Turn off all the working rads again make sure the pumps on full.If a rad starts to work turn that one then off .This is best done witn the boiler thermostat turned off but with the system hot. (It just stops the risk of the boiler going into over heat if theres no where 4 the water to go. Are the radiator valves on both ends of the cold rads open full.

 

[casper 1]

No did not drain the water down but I did have the hot water on @ the same time I tried turning all the radiators off. So thanks for that suggestion I will give it a go and then report back cheers