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I have replaced a control box to one of these fires recently, and itseemed to do the trick. However the initial lighting seems to be a bit hit and miss. But i think this is a bug with the control box itself.

Worth checking all that is mentioned above, but try giving Grundfos a ring, they might have answer straight away.

Why would a clicking sound at rest be associated with a dodgy APS?

Nicknox, a pump most commonly seizes due to the viscosity of the sludge it's trying to push. So simply spinning the rotor will not fix the problem. How long do you guarantee your repairs for? I'd rather fix something and make some money rather than a quick fix for a tenner and go back a week later.

Get the boiler checked out by an engineer to make sure that it's working properly. 4 undersized rads on a system, are you sure? Better controls are alwaysa good option. Weather compensation on a new condensing boiler keeps the boiler ticking over nicely and avoids the holt/cold scenario. Make...

You need a PCB, 20mins to fit and check operation

Buy a house with overheads that are more suitable for two people and let a family move in to a project.

No, ask for a replacement fan. Unless you paid a reduced rate for a temporary repair then you should expect a permanent fix. How much did you pay?

Wall hung boilers are cheaper.

IIRC these had a Riello burner, which are good quality with excellent spares back up. Fear not, oil boilers are arguably more reliable that gas. Just find a good engineer, the one the previous owner used and never run out of oil.

why did you take the cover off a boiler?

We need to get some paid work done aswell!

Sounds like you were too tight to get a registered installer to do a proper job.

Google honeywell yplan diagram for a schematic. Surely you have the manufacturers instructions for the boiler? Switched live from 3 port valve (orange) connects with the switched live from cyl stat to go to switched live in on boiler. Simples Check all the other wiring aswell.

Filling loop is a flexi hose.

That undersink is a work of art, give that man a medal!

I'll bet that when the DHW pump is running, it's taking cold water from the return of the central heating. Does the situation improve when the heating is on and all rads hot? You need check valves.

Have you found the filling loop? Probably under the boiler, it more than likely has a valve at both ends and so they both need to be opened to fill th esystem. Try that first

I'm staggered by some people. I wonder wht area of work Molti does?

Run a boil wash with no load or detergent twice.