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May I ask 2 polite and simple questions? 1 What did you think you would gain or achieve from posting this as an opening link? 2 What kind of response did you think you would/should receive?

Assumption is the mother of all f ups.... It sounds like you need an upgrade on the pipework. Also the next engineer who comes could find a 1.1mb or higher drop on pipework and shut it off. That could be middle of next winter. Couple of days without boiler..... Brrrrrrrr.

Well that's the easy 1 done. Probably best to get engineer in now.

Ok sorry the cold one will be the 2nd black handle from the right side. Is it straight or diagonal?

Look under the boiler, toward the right hand side there should be a blue handle. Is it in line with the pipe or diagonally?

It sounds like the temp knob is set wrong but it could be a faulty board from supplier. It can happen.

Blockage in boiler or probably the cold iso valve is closed too much. It is usuall closed slightly to regulate the flow through the boiler.

Joe just bog of will u or this will be another post u have ruined! For clarity, if you were to turn temp knob to max it runs to 50? Have you tried turning it down slightly (10%) to see if it then goes to 40?

No1 you have already done more than you should. No2 playing with the condense trap can lead to flue gasses coming into your home. Have you watched corrie recently? No3 get an rgi in who is experienced on this boiler No4 do you think that rgi's would spend thousands getting qualified if it...

Firstly I would imagine the blowers would have a connection for the room stat. So the 2 ports probably not required? Next I would put 2 smaller boilers in cascade with low loss header etc. and your pipe sizing is way off. Min 35mm up to 2nd heater.... It's a little far for me but if price was...