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I wonder if photos would help? If the banging has stopped, I doubt it’ll be the earth bonding (the green/yellow cable) you mentioned. Perhaps a cheap plug in tester or an electrician with one to maybe pinpoint the faulty circuit? If you say where you’re roughly based, maybe someone on here can...

It will be a struggle to get everything in that small area, so either the pipe can be re-routed to the right before joining back up or if possible take it higher. That white push fit blank looks like a dead leg too, which can cause water to stagnate

Have you checked for moisture ingress? Those wires that are loose in J3 - any connected to earth/cpc?

In th’neighbours

It’s hard to tell, but the fins of the flexi might not be in properly or in front where the silicone is located, might be a gap?

Wow! Maybe he just installs them then? The pressures are generally the same, therefore balanced Maybe try Joule?

It wouldn't do any harm

Ok. So you have an unvented cylinder, which works off the incoming cold main. There are a couple of reasons why the “pressure” may be low, but only one you can check as DIY - make sure the stopcock is fully open. Everything else needs a G3 registered engineer.

Unless it is restricting the pressure sensor reading, I would say no.

Both of those are heating pumps. What hot water cylinder do you have?

Absolutely xx

Could be part of the shower valve/cartridge or could be a flow regulator on the head broken (if applicable).

And I would slap you again if you asked again :LOL:

The tool linked won't really work if its soap scum. Probably going to need a flush or soda crystals/bi-carb and boiling water

It could be soap/grease build-up. Have you tried clearing the trap hair collector? A plunger may be better.

Cold water flow rate ok?

New one on me, but I only deal with combi’s mainly. Did you agree to Vaillant engineer? If not, should be installer paying imo. Probably, but you have had to pay the Vaillant engineer plus a site visit.

Potentially, but as you say unlucky. Yes, check live feed back to boiler

Well, that's odd, because originally boiler would not fire for hot water. Can you post a photo of the pcb wiring and the front of the boiler? As per @Mottie - It should be your installer sorting, not you.

Ok. Make sure the cylinder is calling for heat. When the boiler comes from the factory a link is in place at the pcb until Heating controls are wired in. I forgot yours is heat only, so the heating side is used for the hot water, however, If the link was in place, then the boiler would be...