well i,m back home again and looking foreward to some hot water soon when i have the boiler switched for hot water and turn on the hot tap the boiler fires up but still no hot water it,s had lots of new bits and bits cleaned out every time something renewed something else goes three way valve was first which leaked and took with it the motorised switch and cable and pcb with it followed by the pump but whats stopping the hot water comming help please paul