Not all my heaters are coming on

[swansea v6]

I have come into work this morning (its a small gym) and although 6 of our radiators are working fine, two are ice cold. I had a small leak in one fixed last friday and I bled the system yesterday. Is there something obvious I have missed or should I re-bleed them all, not just the ones that do not come on?

Our showers are nice and warm so it sis just the two rads that are not working?

[Gingerbread Man]

Get the rads warm then turn the ones off that are working, hopefully it'll clear out any air locks.

[swansea v6]

Cheers will give it a go!!

[Buzz word]

Are the pipes going to it cold? When my house radiator stopped working the pipes were cold and bleeding didn't make it warm. It turned out the needle valve in the thermostatic valve had seized. Unscrew the thermostat bit and use some needle nose to gently push down and break free the needle.

[swansea v6]

Pipes to warm rads are warm, cold ones are cold. I have turned up the cold ones and turned down the warm ones to see if that helps? If not I will try the valve.

[Buzz word]

If the pipes are cold I think it should be the thermostatic valve then. A bleeding issue would have warm pipes and the radiator would be only half hot. It could still be the lockshield valve. Try opeining that up fully first just to test. All my knowledge came from here though when trying to fix mine....
http://www.youtube.com/watch?v=wqku_Rc_YuI

[Gingerbread Man]

Have the rads got thermostatic valves on them? They might not.

If turning off the working ones didn't force the hot water to the cold ones, then it could be a valve issue. If they're thermostatic valves, try removing the thermostatic head and see if the pin is stuck down, they should protrude out of the valve body by ~8 or so.

[Ferg]

Are the cold ones on drops from above? Are there vents on up-and-over pipework?

[swansea v6]

Took off the thermostatic valve covers and hit the 'pin' with a hammer and heh presto they came back to life. Such a simple fix and quite chuffed I didn't call out the plumber for that??