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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...

From the previous pics and these it looks like he didn't use a flush pipe bung at all. Hope you're leaving a review and going through the sites complaints procedure..

Should always put a bit of silicone grease/soap on the key o rings before using.

Ask the neighbours to see if they've noticed a difference..maybe the networks been upgraded.

An asymmetric timer any good? https://www.enrgtech.co.uk/product/timer-relays/ET13844276/1CJDT0

21 is excessive....we've all gone soft over the last 30 years...average indoor temperatures were around 15 degrees up until the 90s. It doesn't take long to acclimatise to lower healthier temperatures.

This is a pointless discussion given the excessive room temperatures. Even a slight decrease in room temps will far outweigh any system twiddling to get the boiler condensing a little more.

When the boiler was serviced its likely the boiler pressure was topped using the green lever valve. The black plastic assembly is a backflow prevention device to comply with the water regulations and the threaded drain is part of the design. It is normal to have a little water drip from the...

The noise may be due to the differing expansion rates of the stainless steel front of the heat exchanger and the aluminium burner manifold that bolts to it....the grease alleviates the problem.

Did they put the grease around the burner threads and mating faces? It was supplied in a sachet along with the graphite burner seal. unless that changed.