it won't be classified as at risk due to a dirty system. must be a flue, ventilation, or relief pipework issue to be classified as such, check the paperwork he should have left.
as for the system needing cleaned out, that's a different matter.
don't assume that the system is good as you have a new build, there are 2 estates i work in regulalry which are very poor and have been built in the last few years.
Only some types of plastic pipe are approved for use with heating systems, but it's very unlikely that the pipe used in your house in unsuitable due to just how new it is.
There is a small chance that the system could be very dirty after such a short time, but only if the original installers haven't flushed it out or if someone has added cleaning chemicals to the system.
What was the original fault?
Ian
March 2010