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The push rod on the diverter valve is coming up quickly and is firm. It's reiggering the microswitch that is lighting the demand lights. I have replaced the microswitch but nothing changes. I can't find a reference to a Relay in the manual. I wonder now if one of the pcb's has failed...

Thanks ChrisR, I'll take a look at these and let you know

After searching the forum for a while I'm beginning to home in on the causes of my problem but I'm looking for some confirmation that I'm not barking up completely the wrong tree. I am after all not a plumber. Yesterday all was well with the boiler. Today, opening any tap on the hot water...