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Sounds like a job for a digi manometer T piece setup

Possibly a pump/pump bearing issue. Recoup not draining condensate fully had these causing noise however this is part of the flue system and shouldn't be tackled unless you know what your doing

Yep. The temp sensor for heating is quite simple on this model. It's on the brass manifold in front of you connected by red wires. Remove all pressure from the system and isolate heating flow/return quarter turn they are the 2 22mm valves at opposite ends of the boiler. Draw the PCB...

You don't necessarily need an outside wall. Boiler location comes into zones in the bathroom as to where it can be fitted and as stated above also depends on the IP rating

Unsure as to when it officially came in. I contact gas safe in the morning. The builders I have worked for have post dated remedial flue inspection plates back to 2007. It is a serious issue. I have had to rectify new builds dating back 18 months with poorly installed flues. Builders...

keep me advised

www.nhbc.co.uk/Builders/Technicaladviceandsupport/Gasboilersfluesinvoidssafetyalert/ This should answer your question. It is the builders responsibility.

Ok. Rules out flow switch. If you can push diverter to heating and boiler runs fine and rads get hot (without error codes) it suggests an issue with the diverter valve itself

Not sure of the exact dates but I seem to remember flues in voids should be visually accessible is older than 2 years. And your property is still covered under the builders warranty

I'd get the service done first before purchasing parts. It may be something as simple as faulty meter governor or just needs cleaning

Correct. It's their problem. The property should meet regulations. Regulation state the flue should be able to be inspected along it's entirety to conform condition of joints/flue and supports.

S, D or F are the codes on these are you sure it's not S13 which would indicate a DHW operation

If still under builders warranty the flat is likely to be less than 2 years old. No. It must conform to the reg's. If you can't see the flue along it's entirety then inspection hatches must be installed. If the builder sold it to you without conforming to the reg's it's their responsibility...

did you buy it new build or resale

You may just have flow direction set wrong for each valve. Though I'd agree with Nige F and ditch one TRV end and replace with a conventional lockshield.

Also I'd ditch the rubber washers and replace with fiber ones. Or be very gentle when tightening up as with comp/bsp fittings it can easily damage the rubber washers.

That more or less rules out the HW flow switch (presuming that's what he meant as these boilers I'm sure don't have a pump flow switch they work off heating sensors flow/return differentials) Though you could try unplugging it and running heating to eliminate it