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It seems that, unbeknown to me, there was amains pressure problem in our street. Many had similar boiler issues and some houses even lost water altogether. Anyway the water board had rectified the problem and things have returned to normal for me. It seems there was nothing wrong with the boiler...

Ok so no pressure drop unless heating has been on, even although pressure is maintained when heating is on, it would seem, without fiddling with any valves, thatbthere is a crossover/leak from heating side of things into the mains. Does that indicate a heat exchanger problem like you suggested...

Another point of note is that this afternoon after checking for leaks under the floor I drained down the system and refilled it to 1.5 bar. For four hours the heating was not on but hot water had been demanded several times with showers etc. During this time there was no pressure drop. It seems...

The only thing on the pipe is a slotted screwhead directly under the pipe at the coupling where the pipe enters the boiler. Every pipe on the boiler has the same thing at this point. Could that be the valve? Thanks..

I can identify all the relevant pipes from the diagram in the manual but I don't know how to isolate them. There are no obvious valves on any of them.

Well checked under floors today and no leaks at all from pipework or radiators. Pressurised expansion vessel again just to be sure it's not this but system still losing pressure, about half a bar every 2hrs. Don't really know what else to do as isolating things etc is beyond my DIY abilities as...

Mostly all of my system is plastic piping except the pipes directly to the boiler itself. Don't know if that affects your copper pipe expanding theory. I'm going under the floors to check for leaks tomorrow and will report back my findings. Is there any way to pressurise the boiler then isolate...

It drops about half a bar of pressure every two hours or so when the boiler is not operating so yeah quite a lot of water appears to have been lost each time. Definately no leaks at radiators and no leaks in upstairs pipework as I'm sure my ceilings would have collapsed by now! I have suspended...

Hi. I have a Worcester Bosch 28i Junior boiler which is 4 years old. Last year, after the cold snap, when the outside temperature began to increase and the boiler wasn't on as much the pressure began to rise to 3 bar when boiler was operating and discharged water via outside prv overflow. I...