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Without seeing the house it’s hard to judge , Vaillant system 37 kw can be range rated , would have thought you would need 28 mm for gas especially if you have other gas appliances

Flow turbine faulty

Open the two back handles till 1.5 bar then close them

Why don’t you just fix the cm927 it takes about 10 mins to do

Do all radiators have trv’s on , if so take one off when the noise happens to see if it stops

Check the expansion vessel , also where is the expansion vessel sited

There is a Honeywell valve replacement for the white Rodgers valve

Sorry for your lost , does sound like a motor valve issue . But need more info What boiler Controls Etc

Comes in both forms B/f and O/F

Pump , blocked cold feed but pump would be my first choice

What size is your pipe work it should be 28 mm off boiler

Make sure there’s water in header tank and cold feed is not blocked

Check pump is working or weak pump

20 wraps of ptfe tape

You haven’t said what pipe size is under floor

I always put mb3 on the return on a open vent boiler

Sounds like pump then, or pump has sludge in it

I still think you have air in system sometimes I had to leave pump on for hours to clear air . Have you any bleed valves on heating system apart from rads

Turn all rads off accept one let that heat up and then turn to next rad so you are only doing one at a time put pump on 3

Check pressure on boiler Yes hot water dial is not used on boiler Sounds like faulty 2 or 3 port valve