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Something like a 4 pin lighting connector or RGB. Anything printed on the block?

Wiring appears ok. Can you explain more about what happens when it suddenly stops. It just doesn’t work, it works but then doesn’t come back on?

Club/lump hammer and decent cold or bolster chisel.

Check your wiring for a start, eg terminated correctly? Screwed down on insulation?

Can you elaborate? Do you have a combi? If so which one? More information is needed.

Some things work on reversed polarity

That one at the back with the drain off, look above that

If the pump is in the loft (I’m not familiar with the shower) then a Surrey flange or similar should have been fitted. It could be something as simple as poor pipework Installation.

Yes, you can usually bung it (the cold feed on cold water storage cistern). There’s usually one as a gate valve (not always though) from the cold feed to the cylinder, usually entering the base. Photos of setup?

Could be, but doesn’t explain why the flow pipe would be hot

Certainly worth a shot if that’s all it is.

Diverter probably not energising across properly, had this on multiple occasions with the Ecotec pro.

Sounds like it’s could be the diverter valve, but best getting a professional in to take a look.

Could be a few things dependent on: model of Vaillant, any work carried out recently, feel the flow pipe from cold and feel if it warms up.

Just look like transit pieces to me. They usually have something covering the hanging bracket.

What about a kitchen cupboard slotted over it and then just box in the pipes?

That’s why I said rewire to correct terminals ;)

Why is this? Are you sure it’s a multimeter? Sounds like a 2 pole voltage indicator. I would rewire the switch with just LNE and connected to the correct terminals

So it sounds like you have reversed polarity. Is that brown also connected to the earth terminal?

Are you sure it’s a neutral? Could be a switched live.