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I'm thinking its a poorly connected overflow pipe, (the grey plastic pipe) this will explain why its intermittant, as the leak only occours when the overflow is 'leaking' which is usually after a period of non-usage of the water system, change the float valve and hopefully you will be alrite!

does the pump run and the boiler stay alight or does the pump just stay on for a while?

Nice one :D The second link is exactly what i was looking for! ...cheers mate :D

Anyone got any links to the exact operation of the internal circuitry and not the 'basic' operation and external wiring. Its this weeks mission that i have assigned myself :D (its to get me started on electronic circuitry know how). Yes i am sadder than sad McSad from the saddest sad...

Regulation: R15.13.2 page 6.37-6.38 in the 'WRAS: Water Regs Guide' http://www.amazon.co.uk/Water-Regulations-Guide-Laurrie-Young/dp/0953970809/sr=8-1/qid=1170918618/ref=pd_ka_1/026-1672859-4416428?ie=UTF8&s=books

warm at top and cold and bottom means that the TRV has turned off at a set temp or sludge. turn all other (working) rads off and see if the prob rads get hot, if so then you may well need to balance system, if not may have bad pipework installation/sludge etc... and when balancing the...

fin brilliant for people who want to learn about these things - this is coming to collage with me, this will be a godsend for the nippers :wink:

there is if the cold and hot mix within the body and not the outlet.. on unbalanced supplys.

the waste that you have fitted are a pain in the ar*e !!, i usually 'plumbers mait' the chrome\brass bit to the bath (no washers) then silicon a washer to the underside of bath then silicone the overflow bit then use another washer (silicone between washer and overflow bit) then the nut. it...

Denso - whats not according to Water Regs?

if the TRV's are bi -flow then you will be ok, but some 'bi-flow' TRV's need adjusting (Danfoss RAS-C2 for eg). look at your TRV bodies and see if there are any arrows on them, a single ended arrow means one way flow and a double ended arrow means bi flow. They are probably biflow due to the...

If the water mixes within the tap body then you must put a check valve on the cold and its wise to put one on the hot to prevent back filling of the hot water system. If (as mentioned) you are using a bi-flow mixer then there is no need for backflow prevention (if the tap gap is maintained and...

I notice that modern toilets fill in minutes\hours not seconds :? ..but i'm a 4 year old 'newbie' (4 years plumbing that is :wink: ).

replace it with a nice'n' new plastic jobby complete with snappy lids and other good stuff :D

as long as the pipework is entering a vented drain :wink:

if the pipe is dripping then you will be losing pressure, what is the pressure at the mo? are you constantly topping up the pressure? The hot water prob may be unconnected to the dripping pipe (PRV\safety pipe) though.

pressure gauge or pressure gauge sensor faulty? - i'm giving up now as i will just start to confuse you with my guess work........good luck with the prob :wink:

did you do any soldering on the new radiator? - if not a simple draindown through the new radiator will suffice, then lock the rad off (close both valves on radiator ) fill system, fill radiator with inhibitor, double check for leaks on new rad, open rad valves on new rad, bleed rad of air...

cheers mate :D though that was for 6089 and i'm doin 6129 scheme :( thanks again :D

i'm probably getting confused with the 'normal' set up on a combi (i.e. new!) you've probably got a 'box' basically a 3 port valve the switches on command from the flow switch, as opposed to an integrated diff pressure diverter that is an all in one unit. (go on kevplumb ...teach me! :D ).