cold radiators

[jhnnegus]

can anybody tell me why the first 3 or 4 radiators in circuit are hot and the others further on are cold? They all have trvs on them,

 

[seco services]

are the trv's all working or an airlock in the pipework.

 

[jhnnegus]

how can i find out if the trvs working and clear the airlock

 

[seco services]

unscrew the trv from the valve and their is a brass pin on the valve.
use a coin flat on the pin and push it down does it move freely.

 

[jhnnegus]

thanks will give it a try. How about if its an air lock?

 

[seco services]

shut the hot rads off and see if the cold ones get hot.