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no hot water

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not recommended for single feed open vent cylinder,as this will mix heating water and domestic hot water
if it is a system with two tanks,have a look in the domestic hot water tank,the ballvalve may be blocked or siezed,and the tank has just run dry
Unless you have just carried out work on your system it is unlikely to be an air lock
 
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How are the two going to mix? You have the F&E tank for the heating water and the CWS tank for the cylinder. Please explain, I may have missed something?
 
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sounds like the feed to cylinder pipe is blocked with polystyrene of the cws tank lid to me.
shove a hose down it and blow it into the cylinder, take of the top tank union and suck it out.

could also be the bottom of cylinder clogged with scum, specially if its an old one.
do the same shove a pipe down to bottom and vac it out,
 
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ok boys , i take it you don't know the principles behind a single feed indirect hot water system!

if he has only one tank ..yes thats one tank this isfeeding what is generally known as a Primatic cylinder! this is really a trade name for this type of cylinder.
this cylinder is fed by one...yes one tank, this one tank...yes one tank or should i call it a CWS . will fill up the circs and heating system until it starts to fill the cylinder at this point,for want of a better discription a bell inside the cylinder will seperate a small amount of water forming an air bubble this bubble will be the expansion for the heating system! doing away with the F&E tank
THat5 is how they could mix, as if you mains fill this style of cylinder the bubble is broken and your waters mix giving you dirty brown water to wash in
I will put your lack of knowledge down to inexperience! have a good day
 
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wot = what. Don't need a spell checker

To much if but or may be, THE ONLY WAY IS FOR US ALL TO GO ROUND AND HAVE A LOOK.
if its that bad /scale up change the cylinder for a new one.

ABOUT 15 YEARS AGO a cylinder went pop ,seeing the left over of a flat and the neighbours was not much.
We Replace with new cylinder and a Essex flange aav ,after it was rebuild.
act before its to late.
 
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when i post i only give correct advice if i possibly can, if i ever come across as a pompous idiot then i will allways apologise what i will never be is rude or use offensive language, a couple of our junior members should follow a good example
 
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That's because that's not the problem,Or the answer. there all dead by now
or very little installations
 
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in the northwest they are still going and indeed can still be readily purchased i have seen three this week
may be sometimes a reply to a post can be swayed by where you live within the uk
i do think that they were not the best idea in the first place and would seriously recomend its removal and a f&e installed with the alterations of pipework to suit
 
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with leaky on this.Been to one today thats been in approx 6 years,house is about 40 or so years old but customer loves the old system.and yes you can still get them but geeze there not cheap.
 
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whent to quote for one the other week £1,200.
not heard from them since? tank cost £600 2 pumps re-plumb, sparky etc, wont have combi either because there jewish?.
just waiting for the call after its burst now lol.
 
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nigelh,
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