One cold radiator, all others working ok. Checked everything possible (except messing around with pump). Had radiator off 3 times and power flushed. On replacing the radiator the water is reasonably hot at the bottom but after bleeding heat moves to the top but cools down and is barely warm and there is no heat left at the bottom of the radiator. Because the rad has been flushed I do not think it is the radiator. Is it possible that there is not enough water flowing into the rad? I renewed the valve but water appears to only trickle into the rad.
Cold Radiator
- Thread starter elmacko
- Start date
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Check the valves, there may be an adjuster which is screwed down, i.e not letting enough flow through the rad.
Hope this helps.
Hope this helps.
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WabbitPoo.
No, I haven't done anything recently. The radiator has been off donkey's but I never got 'round to do anything about it until this week. I don't feel the cold but my wife does! I'm more or less convinced that it is the radiator itself (I've balanced but to no avail) but I've flushed and I always thought that there were no working parts in a radiator and apart from sludge/rust nothing could go wrong. B & Q here I come.
No, I haven't done anything recently. The radiator has been off donkey's but I never got 'round to do anything about it until this week. I don't feel the cold but my wife does! I'm more or less convinced that it is the radiator itself (I've balanced but to no avail) but I've flushed and I always thought that there were no working parts in a radiator and apart from sludge/rust nothing could go wrong. B & Q here I come.
More likely the pipes or valves than the rad. Especially if you have microbore pipes. A thermostatic valve might have stuck shut.
If the rad has been off a long time sediment may have collected in the pipe.
If you take the rad off and open the valves into a bucket, does water flow freely from each?
If the rad has been off a long time sediment may have collected in the pipe.
If you take the rad off and open the valves into a bucket, does water flow freely from each?
Water flows freely from both ends of the radiator when drained. Water in the flow pipe is red hot but just seems to stop at the radiator entry (valve gets hot). When replacing the radiator the water that flows into the radiator is hot at the bottom. After bleeding, the hot water moves to the top as it is supposed to do but then goes to just warm while the water at the bottom of the rad is cool to say the least.
JohnD said:
JohnD.
No, it isn't a thermo valve and yes water flows from both ends of the radiator/pipework although as I've said, the water just appears to trickle from the flow valve into the radiator. I power flushed the radiator until the water ran clear. On refilling and emptying again the water from the radiator was clear.
Getting fed up now. Went to B & Q yesterday for a new rad but they did not have one in the required size, 1000 x 500. As a last resort, is it possible that there is not enough flow of water leading from the manifold outlet through to the problem rad. or am I being silly. All other rads. are getting their share of water from the individual outlets.
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