multiple radiators not warming

[spud13]

hi
i have 11 radiators in my house and currently only 4 are working.
i have bleed them all and the trv is working ok on them.
the circulator pump appears to be working - pipes to and from it are warm as is yhe return pipe to the boiler
any thoughts or suggestions?

 

[Knappers]

Could be a range of things. Even if your wanting to do work yourself I think an hour or two from an engineer would be really helpfull to atleast get you going in the right direction. Despite common misconceptions most of us are well worth the money!