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Many thanks, makes sense. Your help is appreciated

It's a fairly modern house, built around 20-25 years ago. About half the floors downstairs are tiled and the rest floorboards & carpets so some would be easy enough to pull up and take a look. The tiled floors will obviously be a nightmare to do. What do you mean when you say the 'loss is on...

Thanks - it's about 20 years old - there are radiator pipes under the floor voids, however, pressure is lost even when I isolate the flow and return CH valves. This is why I'm suspecting that one or both of these valves is not sealing and hence even when the boiler is isolated, pressure is being...

The only white plastic pipe appears to be on the first pic and goes into the area of the Gas valve

So the boiler is a Vokera Linea 28 - according to the manual, there should be a condensate trap/pipe installed, however, I can't see where this is or indeed if one is actually installed.

My combi boiler works fine when running, however when it's left off for a while such as overnight, it loses all water pressure. - I've checked and replaced the PRV and confirm that no water is lost at the PRV - I've installed a new Expansion Vessel and confirmed this is working ok - I've...

I have a Vaillant gas boiler that has a water pressure gauge and a Megaflow storage tank that also has a water pressure gauge installed near it. My problem is that the water pressure gradually drops from 1.5 bar to zero over the course of about 3 weeks - I can re-introduce the pressure by...