Hi,
One radiator is only heating for the lower few inches, the top half remaining cool or cold. When trying to bleed it, nothing comes out - i.e. I hear no air being forced out and nor does any water come out. The pipes before the valves are hot and hot after the valves - is it likely a valve is stuck or sludged and the heat is by conduction?
Suggestions as to where the problem may be? TIA
Sounds like both pipes or valves are blocked if you cant bleed water or air out of it.
What type of system do you have i.e. sealed (combi boiler) or gravity fed i.e. hot water storage cylinder somewhere? If the former then pressure up your boiler via the filling loop (braided hose underneath usually) then bleed radiator concerned, the pressure will force out the air. If the latter have you tried removing the bleed screw completely, do not loose it and have it close by!! Then using a suitable prodder clean out the vent hole in the radiator, if it has been 1/2 empty for a while the vent hole may be crudded up. This happened to me once and that sorted it.
HTH
John
If you have a vented system, check that there's some water in the F&E tank[1] in the attic. It's fairly common for the ball valve to seize up due to infrequent use, and for the water to evaporate. This would certainly fit your symptoms.
[1] The small tank which keeps the primary circuit topped up, not the large cold header tank for the domestic hot water system.
Gravity fed. Will try your suggestion. Thanks.
Thanks but the tank is fine.
Regards.
{snip}
Looks like a blockage in the radiator. Loosened the bolts at the top and managed to bleed it. Thanks all.
In message , Geoff writes
well, this eejit here has spent some time today trying to get the radiator in the spare room working
... having forgotten that he turned the rad valve off last year
how embarrassing
so, sounds like you have either done the same as me, or you have a stuck valve
Do you have a TRV on it, with a stuck pin ?
Older systems frequently had the pump in the return pipe to the boiler, and with this layout you may find that if you try to bleed a system with the pump running, the radiator may be close to, or even below atmospheric pressure so very little happens. Worth trying bleeding with the pump off - not much lost if it makes no difference.
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