i have 2 radiators that wont heat at all, they are the 2 furthest from the boiler, both with relatively new trv's which arent sticking, i bled each rad with both valves closed, then opened each individually and pressure came back, so all 4 valves connect the system pressure in the pipework into the radiator, i have tried closing every other rad valve as well as putting the system pressure up to 2 but the flow pipe to these last 2 never warms up more than a few inches beyond its join with the previous radiator, which suggests there is some kind of blockage, but my test of each valve suggests not..
this is really doing my head in, am i missing something simple????
thanks

Gavin, November 2010

remove rad completley and connect the return and flow with a lenth of copper tubing, turn on the valves, if the length of tubing gets hot then it's your rads, if they are not getting hot then you have flow problem suggest you install a socondary pump.

cyber, November 2010