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Looking at the wiring diagram I'd say number 7 yellow is the room stat when switch live is made, cylinder stat I think is behind the black box which appears to be connected to number 5. Obviously not wired as per the sticker on the back of the wiring center.

Gotta love a Chinese Worcester knock off :ROFLMAO: . Could be the diverter valve/motor. Fuse could be the pump, electronics et al.

Could be a tap fault, although unlikely, pipework fault, or even just trapped air.

Can you post a photo, maybe someone will recognise it? That's the thing with taps, especially 1/4 turn where there must be at least 20 different types

No. EMS (Worcester’s own control) or standard on/off.

In the 2 years from Giovanni you’d hope so. As per deleted member and @muggles you’re asking for gas related advice.

Aye, could be the pump but could be expansion related.

It’ll work standard on/off but Worcester like Vaillant/Glow worm have their own control version of opentherm, so that part won’t work.

No problem

Hi, yes that’s the one. Apologies for not mentioning it. I used to come across this often, you have the prongs of the arm from where the washer is too high. Have a look at your original photo for clarity, but I’ve added a photo. Unclip from the lugs, feed arm into lower part to move the float up...

Doubtful as: Does it happen every time the tap is opened?

A few. Often the diverter or motor, but you said this has been changed along with I’m guessing the plate heat exchanger, which would be the next idea. However, you mention the boiler isn’t seeing the hot water demand, so could be the flow sensor.

Simple tests should have been carried out before replacing components. This rate it would have been cheaper having a new boiler. Yes, are you able to isolate the cold feed into the boiler? If so, do this and run some hot outlets. If you get water trickling or decent flow you have let by of a mixer.

Sounds like trapped air. How long has it been happening?

Sounds to me like you may need zone valves, or perhaps a relay system

Do you have any mixer taps/shower?

CPC, Farnell, RS Components, Ebay to name a few

Brick acid/patio cleaner

Probably best with solvent weld. I thought rubber ones were for push fit?

I’ve been thinking about it and might move the tote to the van vault, see if it makes a difference.