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Many thanks for the speedy response. Can you explain a little bit more about it. Thanks

So partner of 8 years decides to leave before Christmas and I'm now left with a large 4 bed semi which is getting damper by the day. 5 years ago he decided to pull off all the original render and it took him 4 1/2 years to scratch coat some of it. With the bad weather and being on a...

So partner of 8 years decides to leave before Christmas and I'm now left with a large 4 bed semi which is getting damper by the day. 5 years ago he decided to pull off all the original render and it took him 4 1/2 years to scratch coat some of it. With the bad weather and being on a...

So partner of 8 years decides to leave before Christmas and I'm now left with a large 4 bed semi which is getting damper by the day. 5 years ago he decided to pull off all the original render and it took him 4 1/2 years to scratch coat some of it. With the bad weather and being on a...

So partner of 8 years decides to leave before Christmas and I'm now left with a large 4 bed semi which is getting damper by the day. 5 years ago he decided to pull off all the original render and it took him 4 1/2 years to scratch coat some of it. With the bad weather and being on a...

So partner of 8 years decides to leave before Christmas and I'm now left with a large 4 bed semi which is getting damper by the day. 5 years ago he decided to pull off all the original render and it took him 4 1/2 years to scratch coat some of it. With the bad weather and being on a...

tried that, still no good. everything seems to be working but no heat.....

sorry, just realised i've done all that. drained the radiator down a few hours ago and kept the return feed pipe disconnected from the ball joint, water was flowing freely and eventually got hot, trv was open.

lockshield valve - when the problems first started, i locked this right off and then did quarter turns. will try what you suggest about draining it off. how do i check to see if i have a flow through the TRV?

Already checked the pin. Both valves were fitted as per instructions. You can feel just past the TRV and its piping hot but it just doesnt seem to move further into the radiator, if that makes sense.

Going back to the pressure, would the pressure from the return be as good as the pressure on the feed pipe?

The new TRV I have put on is very similar to the ones on existing rads. I also have the same TRV on a new rad upstairs which is working fine so my thinking is its not a one pipe system?

can you tell me what the difference is between TRVs. What would I be looking for. Would it be easier to eliminate the TRV altogether and work off the room stat?

p.s. connected it to the tails not towels(!)

its a double convector radiator, we've connected it to the towels and bought the two valves, the TRV and the lockshield valve..

No it didnt have a TRV before, would that make a difference. To be honest, I'd be quite happy to remove the TRV if that would make it work.

unfortunately i dont have a clue, can only see the pipes so far under the floor.

ok, all rads have been turned off and its made no difference to the new radiator at all, any suggestions?

simply screwed them on, they're compression joints.

each radiator has one pipe in (feed) and one out. dont have a combi boiler and there is two tanks in the loft, one for water, one for central heating. also have an immersion with a self vent tap(?), where air can escape. dont have one of these on the boiler.