Hi every one my friend advice me to ask around in forums about problem we have with our boiler in August 2011 we has Biasi Riva advance HE model M110b.24SM/C. It has making fine noises recently and one day it just stop working me ask friend who is corgi registered come and look at he told us PCB need be change we went to London and have our PCB checked tested and repaired put it back and noting change no hot water even into single nose from boiler please HELP maybe some one have some idea what could be wrong