2 x radiators no longer heating up

[Dave Lockyer]

Hi. I have a couple of radiators in my conservatory that are no longer heating up. One is getting slightly warm but the other not at all. The radiator units are ony about 3 years old and were working fine until 6 months year ago. I've loosened the bleed nut and they appear to be filled with water and there is pressure in there but for some reason the hot water is not flowing through them. Any ideas? The rest of the radiators in the house are fine and have been bled, except the one before these two only has one side working.

 

[oldbutnotdead]

What do you mean 'only 1 side is working'. Did this change happen suddenly or gradually? Any other changes done at the same time?- especially change in pump settings, someone playing with lockshield valves? Any zone valves on the system?

 

[Dave Lockyer]

What do you mean 'only 1 side is working'. Did this change happen suddenly or gradually? Any other changes done at the same time?- especially change in pump settings, someone playing with lockshield valves? Any zone valves on the system?

The rad before the 2 that aren't working has two chambes. One of which is fine but the other appears to be clogged up (nothing comes out of the bleed point when fully undone). I haven't changed anything else. On of the radiators nto working appears to be slightly warm towards the top rather than the bottom so I'm wondering if they are both slidged up....