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Thank you guys - it is the cylinder thermostat that is kaput. The boiler is filling the cylinder with water at about 60 degrees. I had to turn the cylinder thermostat down to about 30 degrees before it shut down the motorised valve and turned the boiler off. I then had to turn it back up to...

Thanks again guys IanMcD - turning off power to heating system caused the valve to close. So as you suspect, a control problem rather than a seized motor ? Harry B - it is a spring return valve. Photos attached. But as Ian asked too, the valve does close when the power to the whole system is...

Thanks all - just to clarify, although the valve is clearly open the boiler is not constantly heating. Presumably it does heat when the cylinder thermostat calls for it, as the system produces hot water. I suppose my first question is whether the valve being open in such a situation is an...

I have a central heating and hot water system that was installed a couple of years ago, and works, providing heating and hot water as it should . That should be the end of the story, but the loft space ( 10 cubic metres) that the Worcester boiler and the pressurised hot water cylinder are...

Well the room is toasty warm - for 3 days since the last intervention. Its still slow to heat up, and I know its not reaching its maximum temperature, but it will do. Thank you all for your advice and suggestions, which have chipped away at this problem, and given a novice the confidence to...

if that is a question related to earlier in the thread - yes I did. If it is related to the mains flush, then to start with there was an extra rad open, and then I remembered to close it like I said. but now it doesnt seem to close at all, ( it turns to close, but the rad still gets very...

Mains flush completed - 15 minutes each way. No spectacular purge of sludge, but end result is that the radiator is hotter than I have ever been able to get it. After the flush, it took ages t get warm, and in the end I switched off all other rads - then it got hot - I opened other rads, and...

OK I will give it a go - assume makes no difference that it is a non-vented system. plan to turn of all rads first, so is just pipework that will get flushed - correct ? Mans pressure here is not very exciting - dont know if it will be strong enough to push anything.out. thanks

Completed the bucket test ( rad off, run water out through valves from flow and return) - the return had noticeably more force - it filled the receptacle that I was using ( about 2.5 litres) in 20 - 25 secs, whereas the flow pipe took about 50 secs. ( btw - I did the flow first, then the...

thank you I had missed that reference - thanks to you both for the suggestion. Seems obvious really in retrospect. I will try it - unfortunately I will be away for a few days, but will try on my return. Thank you also Paul - I found those series of videos excellent - I closed the rad...

Can you give some details on how that works. What am I looking for ? thanks

thanks again DH no sign of lockouts at the boiler, but I have to agree that a constricted flow somewhere is the logical assumption - but b**gered if I can figure out where This is a schematic of the rad layout this is a ( poor ) diagram of the layout of the pipework to the rad...

OK - I was tired - false alarm - I had left the boiler on minimum. So today a new day - all radiators hot except for the rad in question still. When I turn off all other rads, ( except 1 which the TRV doesnt close), the rad gets hotter than it has ever been, but not as hot as other rads -...

thank you for the advice. I may just have to upgrade boiler and pump to cope with the system In the meantime, I flushed out the flow pipe, and refilled the system ( didnt appear to be any significant discharge). Three radiators refused to get warm including the rad in question...

DH - in which case then I definitely do not understand index circuit, so will leave te subject well alone. I assume then that a 30 m equiv length of 15mm pipe does not ring alarm bells. I have not balanced the system - but I have turned off most of the radiators except for this bad rad. I...

Thank you DH - I had found the document, and looked at some of , I think your, worked examples - which were enormously helpful. I paraphrase the document and calculation - this spur comprises part of the index circuit ( biggest radiator on the longest pipe run) and according to my...

thanks both - I have not really concentrated on the flow pipe, because it gets heat to the radiator - I just assumed the problem to be on the return, and now I know the return is clear. The flow gets hotter than the rad, but thinking about it, I dont know that the flow is strong or not - just...

I have researched as best I can, and it seems that a 20 metre spur ( 30m equivalent length) of 15mm pipe should be well within the ability of the pump - it is the index path, and should only take 0.03 bars, whereas the pump should deliver 0.6 bars typically. ( correct me if I got this wrong...

OK I will try. I only lived here 2 years. The house is 100 years old, and obviously had CH dropped in at some point. Then in 95 a large 2 story extension was added, and I think that the boiler and pump were changed at that time. The boiler is in the loft space, pretty much at the centre of...

Herts - its a brand new radiator and valves - I thought changing them would fix - but more or less the same symptoms. The pump just ticks over, occasionally firing up, and then switching off again.