Hi first time posting, went to a boiler " as above " the pump was constantly running and the boiler was kicking in on its own, it is a S plan, checked and found it had a micro switch out on the hot water diverter value, changed it this morning and found that the boiler keeps tripping out unless I put any of the diverters in manual . Then the boiler runs but you have no controls. I'm thinking PCB. Any advice would be greatly appreciated. Thank joe