Towel rail issue

[cybergambit]

Hi,

In preparation for colder temperatures, I decided to switch on my heating yesterday. I have 3 (three) towel rails in the house upstairs and found that only 1 of them heated up, the other two remained completely cold (including the inlet/outlet pipes coming out of the wall.

I had completely closed the valves for the past few months on all the towel rails and when opening again, found that the rail that worked had valves which opened freely and had many "turns" before being fully open. The 2 rails that did not work also turn but only for what seems a turn and a half or so (very little turn) - this was for the in and out valves. Could this be the issue? (I don't remember how freely each one turned before summer when all the rails worked fine).

Attached is a photo of one of the towel rails in case that helps.

Any ideas please?

 

[ericmark]

Most radiators, be it towel rail or other, have two controls, the lock shield valve controls the speed it heats up at, too fast, and the over valve the TRV, can't respond in time, but often the lock shields are not set correctly, so we rely on the TRV closing on one radiator to force water through the others.

As long as no wall thermostat turns the boiler off too soon, each radiator will get it's fair share once the TRVs on other radiators close. But this time of year easy for a wall thermostat to turn the heating off too soon unless everything set up A1 to start with.

 

[MickyP10]

Full of air?

 

[baldykev]

cant tell from picture if you have TRV valves fitted, but if you have remove TRV head and see if the pin under the head is free to move up and down
often pin stuck