Technically you do need service valves it’s now been part of water regulations for years now, it they are not there when you change a tap you should be fitting them
Why don’t you give gas safe a call be interested in their response being the governing body as it crosses various areas cadent, gas supplier, and private property
Cp12 should be fine but be very careful I have heard of engineers being questioned about their reports by the solicitors on any silly slight defects on whole system not just gas side of things they seem to think the report is about all the heating/Plumbing/gas where cp12 is for the gas safety of...
You shouldn't be playing with this it comes under G3 of building regs and should only be worked on by a registered engineer whether installing or maintaining, it looks like a new install so you should also have got a certificate for building regs notification for the work, you need the get the...
Most unvented manufacturers will specify min 22mm mains with flow of 20l/min 3 bar pressure get it tested before changing over or you will be wasting your money a good plumber should be able to advise on the correct solution.
Your need to work from the manufactures wiring diagrams, trace wiring to components rather than hope someone has wired it correct, time consuming but only way to get it right
Sounds like you have an-inherent wiring issue so may be best to check wiring from scratch once you have that correct you can eliminate any component failures, your be surprised how many people have wrongly wired controls.
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