After fitting new radiator some radiators in CH doesn't work

[tomek]

Can you please advice. I've just moved radiator to opposite wall, new radiator is double size. I have used the same feed and return pipes (10mm) from old radiator just extended them. After filling the system, removing air, put on the boiler, it appears that 4 radiators from system doesn't work . I have standard boiler, water tank on the loft.

 

[Terry lambert]

Tr shutting the rads that do work and see what happens

 

[tomek]

I shutt all working radiators and 3 radiators started working but the new one still is cold (radiator valves are open, no air) . Hot water stops around 2m before radiator. I have moved new radiator around 2.6m from old one and it is double size. I am considering buying new circulating pump, old one is multihead II 5m. I am not sure if it healps when I will instal multihead III 6m.

Could you please advice.
Thanks

 

[Terry lambert]

You could try turning the pump speed up to shift it, or.

Shut both valves, take out one the blank or air vent ( tray underneath) attach a 1/2 inch male iron to compression with a small price of copper, run a hose from it to outside, open one valve until ripening, close, and then open the other.

If it's a blockage this should clear it.

Are you sure you have opened both valves at either end of the rad?

 

[tomek]

the pipe was blocked, now working fine, thank you for your help.

 

[Terry lambert]

Did you use the method I mentioned?

 

[tomek]

yes, I did attached a 1/2 inch male iron to compression and allow to flow the water and air, thank you