It would seem that not wiring boilers correctly is a common problem with Charles Church new homes.
You would think that, given it is a safety issue and one which is only being picked up by buyers' own service engineers or tradesmen, Charles Church would be all over this offering to check and make safe all boilers on any development as soon as they know about a problem.
Sadly, Charles Church are part of Persimmon, rated just three stars (for "satisfaction")by their own customers two years running, would also appear not to care about their customers safety!