So how is the water going down the heating pipe if the pump knackered and the diverter is working fine??
Get someone in who knows what they are doing. Isars are easy to diagnose and fix. I would recommend you don't use someone who tells you it's the diaphragm
Get someone in who knows what they are doing. Isars are easy to diagnose and fix. I would recommend you don't use someone who tells you it's the diaphragm