Cold central heating

[AnonymousImport]

My heating was working until i installed another radiator. My system is a gravety fed one. The boiler heats, the pump pumps and the valves moves but no rads get hot. I think that I have got air in the system near the pump because when i turn the pump off i can hear air bubbles rushing past. I have tried to stop the air entering. Please help

 

[AnonymousImport]

you said you tried to stop the air entering, fraid you didnt, as the new radiator was empty it was full at the same time, full of air, when you turned on the heating system you introduced air into the system which is now sitting at the pump.

you need to bleed the pump. Most c.h pumps have a brass screw in the middle of them this is there so you can bleed them, don't forget to bleed all the radiators too