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More than likely it’s just the seal that perished.Isolate each valve but firstly take note which way the arrow is pointing on pump. Remove pump, change both seals while pump is removed because why not. Reinstall pump making sure the arrow is pointing the correct way. Open valves slowly check for...

I doubt it will be a floorstanding boiler more than likely it has an external condense pump that pumps the condense to a drain as where the boiler is situated, gravity alone can’t get the condense water to a drain so requires a separate pump wired to the boiler.

So you fit a shower pump recently? A shower pump should only feed the shower it seems like from what you writ that it’s boosting all your hot water outlets and not just your shower. I maybe reading it wrong but this is because you’ve connected the pump outlet directly off the cylinders draw off...

Because as plumber/ heating engineer this kind of thing is one of the FIRST things taught not do. A valve of any sort should not be fitted to a cylinder draw off unless it’s situated after the vent. This was obviously fitted because one of your mixer valves was passing causing mains cold water...

One pipe systems work on convection so the water in the pipework that runs under the radiators gets heated up and as we all know heat rises causing the radiators to eventually get hot. This is why adding a two pipe system on to a one pipe drastically affects the circulation causing you not have...

Is this a wind up?

Depends what boiler it is. Floor standing condense boilers have condensate pumps. Also for situations where gravity can’t get the boilers condense to a drain, external condense pumps are fitted. I’ve fit many external condense pumps. And when I say external I don’t mean outside I mean situated...

Because your system is so old then pressure loss is to be expected. Until you see a dramatic loss in pressure then everything should be ok just topping up the pressure when needed. It’s always a risk when replacing old boilers on old heating systems to go for pressurised boilers. Like the other...

LOL micro leaks. Bane of my existence. I’ve found most the time pressure is being lost from small leaks in boiler. Get qualified engineer to remove casing and look for any small signs of water damage/leaks. Usually it’s to do with auto air vents leaking slightly then drying up due to heat...