Radiator stopped working...

[Al D]

One of my hot water rads has stopped coming on. It's the rad furthest-away from the main feed on the circuit on the upper floor.

I checked the plunger on its TRV, but it moves freely. I don't have any reason to suspect the other valve. The system was installed about

10 years ago.

The rad seems to bleed OK from the bleed valve.

I tried shutting of all the other rads in the house leaving the faulty one on, (thinking it might be a system balancing problem) but it still doesn't come on.

Any suggestions?

Thank you in advance.

Al D

[Roger Mills]

Could be an air lock or a blockage. First, make sure that there is water in the F&E tank if it's a vented system - or that there's sufficient pressure in the system if it unvented. Then re-bleed the offending radiator twice - first with one valve fully open and the other closed - and then the other way round. [You may have to clamp the pin of the TRV down to close that unless you have a manual cap for it - or just refit the thermostatic head with a spacer above the pin, and turn it to minimum]. Bleed a couple of pints of water out each way. This will ensure that *both* pipes are clear and free of air. [If you bleed it with both valves open, one pipe could be blocked but it will still bleed].

[Al D]

Thank you so much for the help. I will try the above as soon as I can.

Al D