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British Gas did it right. I added mixer taps later on and the plumbers during the rennovation are the ones who got it wrong. If I can somehow confirm this is definitely the problem I can get the double check valve installed. Is there any way of confirming that this is defeinitely the problem...

Hi Doitall I'm not sure if I have been all that helpful with my descriptions. And I didnt want to bore everyone with every single little change (which may have significance). We bought the house as a shell and there was no CH. British Gas installed the CH system. We then stripped the house...

Tony On our first floor bathroom we have two basin mixer taps and a shower mixer. When I have the taps / shower on but all the way over to the cold side the pump does not come on and it is fed by mains. If I mix in some hot obviously the pump kicks in. This must mean that the pumped hot is...

Morning, Another nail in the coffin. I closed the stopcock at the mains coming into the house, left the cold water tap on in the kitchen (which trickled) and the pump went off approximately every 15 minutes for the hour and a half I tested it. This is pretty normal, although it seems to...

Hi Tony I dont think turning off the mains caused the pump to go off. I will need to leave the mains off for a longer period tonight and I can leave the cold tap in the kitchen on. I will monitor how often the pump comes on but after last night it seems likely to continue the same way it...

Okay. Thank you all. I think this is where this frustrating journey comes to to a very disappointing end and finally where I might have to shell out a fortune to fix the problem or just to live with it the way it is until the leak becomes visible. Thanks again for all your help / suggestions...

Thanks. So basically, Im b*ggerd as I cant identify a any leaks anywhere. How would a plumber go about locating the leak if there is nothing visible?

Morning I tried a couple of things last night. First was to close the hot outlet and flush the loos. Both worked fine. I then shut the stopcock at the mains coming into the house and quite soon after the pump when hunting. Although not sure how that would work as the cold water tank and...

No other pumps and can not isolate the bathrooms either. :cry:

It used to bronze be but now its black since the replaced it (like for like). Its the 4 bar twin negative head monsoon pump.

The loft has been converted so any pipes going to the loft are under the floor. The pump and rest of the central heating system sit directyly under the loft so the pipes go straight up and can be seen again without tearing up the floor. You might be right that it is leaking and drying on the...

Doitall, the leak would need to be after the pump wouldnt it? There is a stopcock after the hot water cyclinder and there is one after the cold water storage. If I turn one of these off and isolate hot and cold outlets individually wouldnt this cause the pump to run dry. Wouldnt the leak also...

Good morning, Good morning. Thank you for all your help last week. I'm a teeny weeny bit closer to find the problem although sadly it is not the wc or anything to do with the cold as the hunting continues when I isolate the cold outflow but when I have the hot outflow isolated the hunting...

Ok. Ill take the front plates off and the isolation valves should be easy to access. PHEW!! I also asked where the overflow goes and they said it goes into the pan / bowl first which fills up and then if that overflows it goes odwn into the waste. So I will try to eliminate whether it is...

The only pipes actually under a cement floor are the underfloor heating in the kitchen so that is separate. Other than kitchen all hot water pipes supply upstairs so any leaks would be seen by stain on ceiling beneath. Only the kitchen hot water pipe must momentarily pass somewhere...

Yeah. I can def get to the loft one tonight but the other one is boxed in and will require some redecorating if I take it out. Lets assume it is one of the loos and I can not see any water movement in the bowl (I will double check tonight). Also assuming the guys plumbing in the loo werent...

Hmm Im pretty sure there is no water running into the bowl as that is the first thing I checked when someone mentioned it could be the loos. It wouldn't make sense to plumb the overflow directly into the waste as imagine how much water you would waste without realising but some plumbers do...

Hi. Is that just to check for water movement in the pan? Well after the cistern fills the water in the pan is dead still in both loos. Checked this early on.

ps Thanks for the link. Will the pre charge vessel have a meter on it showing the bar inside. Skimming the link the pressure should be 0.9 bar.

The wcs are wall hung. I can get to the workings of the loft wc but the other wc is boxed it. I dont really want to tear up the boxing until all options are exhausted. It will def try your suggestion to isolate cold and hot outlet separtely to see which it is. I'll try to do this tonight...