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Looks like efflorescence...try brushing it off and with time as the wall drys the salts may stop coming to the surface.

https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://www.techtips.ie/Valeo/peugeot-citroen-and-fiat-clutch-judder.pdf&ved=2ahUKEwib_5KP1r-EAxUQaUEAHRPHDbEQFnoECA8QBg&usg=AOvVaw18o5MOfW9aRjf0CVMjIVrW My junk Zafira B had massive clutch judder when I bought it (it was...

We can't tell how butchered that box is...it could have a gaping hole into the cavity. If they're prepared to bodge that much then taking a lump hammer to the box won't worry them

Gas leaks on/around gas meters are common and the issue is whether they can find their way into the wall cavity and property. Without seeing exactly how the pipe exits the box we can't say for certain what course of action should be taken. Either way it's a bodge job. Best option would be to...

If it's in a Puma etc the back casing threads are not compatible with standard pumps AFAIR. Take a look on ebay...there's a few new Myson CP53 pumps on there at silly prices..just swap the head over.

Ok so it's got nothing to do with the Greenstar CDi boiler.... You need to get a G3 licenced plumber to sort out your unvented cylinder. As well as ther safety valve the expansion vessels probably flat/failed and given the rough installation don't be surprised if there's a few other things that...

They're always 3 bar..sound like someone's fitting the wrong one in the past.

That cable from the immersion heater needs sorting...it's been pulled out from cable clamp. Looks like you might have a shower pump...show us the other pipework around the cylinder.

Search for Megaflo baffles breaking down on here...they are not problem free.

Get yourself another heating "engineer", only by measuring static/dynamic water pressures and flow rates can you determine whether the incoming service pipework is sufficient. My own place has an imperial copper 1/2 main but with 5 bar static the flowrate is ample at say 1 bar dynamic (the...

Here's a starter.. https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://www.ofgem.gov.uk/sites/default/files/2022-03/Completed%2520DA%2520Summary%2520Report%2520-%2520Radbot%2520Smart%2520TRV.pdf&ved=2ahUKEwjTlevwz92DAxUETkEAHQHBBjwQFnoECBkQAQ&usg=AOvVaw2V_VflUL7GcXbcrU4ZTTvD

Post pics of the outlet hose arrangement. And what temperature are you calling a hot wash?

The ratio is pretty meaningless...it's the ratio between carbon monoxide and carbon dioxide. The figure is "designed" to show how safe the combustion is but the relevant figures we need are the carbon dioxide at the high and low combustion settings. Given the boiler is so new a proper annual...

The component count has massively reduced as electronics manufacturer have brought out purpose designed driver chips. Boiler manufacturers charge what they can get away with...plenty of other Worcester parts are now extortionate.

What were the CO2 readings at high and low setting?

Check the datasheet for the proposed valve..

A bodge would be to install a pressure reducing valve just after the incoming main. Ideally you'd just want a single PRV and the non return valve/expansion valve/vessel to take care of the cylinder (years ago unvented cylinder manufacturers would supply combination valve sets that could be split...

Wrap Teflon tape as a taper. https://www.screwfix.com/p/flomasta-rear-connection-pressure-gauge-10bar/457FA?tc=AT9&gad_source=1&gclid=Cj0KCQiA1rSsBhDHARIsANB4EJaYdZWh59quWr5POtqU_o-Qe_z8nFliEHPlWTmiR7bE8RMWTDh_lZUaAsRrEALw_wcB&gclsrc=aw.ds Your pump/pipework is too small to pull 40kW from the...

Is the red cap on the aav open at least a turn to let the air out. Turn off the cold feed to the combination valve, openta hot tap and when the flow stops check the air pressure in the blue vessel. Get a 1/4 bsp gauge (say 0 to 6 bar) and screw it into the blank port (black plastic plug) on...

Much of your posting makes little sense... What boiler model is it...no such thing as a 49 CDi. What was the fault code? Is it really a system boiler? Perhaps you mean a heat only boiler. It would be most unusual to have an unvented cylinder and Y plan...most installers would not do that and...