Recently moved into my house & had new Ravenheat condensing combi installed in the loft. Thereafter the heating & hot water stopped working on a weekly basis. We located a very small leak in a pipe under the lounge floor and had this repaired. We have since had all new carpets laid, boards all lovingly stripped & varnished but the heating & hot water stopped once more (three weeks after repair of last leak). Is there a diagnostic tool that will enable us to find the latest leak (if indeed that is the fault) so as to avoid ripping up all the new flooring? Is there something that can be poured into the system that will seal small leaks in pipes?