help,i have a BIASI RIVA M90E 24S and it has a problem..a short while ago i had central heating but no hot water..so i have replaced the heat ex,cleaned out the diverter valve and installed a new kit in it and replaced the thermistor switches and also a new diaphragm,now i have hot water but the heating fires up and cuts out immediatley??..can anyone help??

rob, March 2012

Does pin come out and pushes micro switch could be one of problem need new rubber

ltd, March 2012