After recently moving to a new house i noticed the dhw from the vokera 24 e maxin took 3 mins to come on.after reading the manual i changed the diaphram this has not helped.I have now noticed that the plunger dose not actuate the microswitch instantly, my thoughts are the diverter valve next.I have the manual but the fault finding system is poor.Please help any suggestions will be appreciated.The pressure drops off after a week and the living room radiator makes a rattling noise but i think it needs blead can you tell me if the problems are linked.cheers