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That's because there isn't one :wink: It's just a ball valve with a stepper motor actuator controlled by the PCB. Still, all is well now - for the time being :? I've not been impressed with the overall reliability of it since the first diverter went tits after little more than a year...

Thanks all Sorted now :D It was the flow sensor - it has a magnetic pickup which senses rotation of a vane inside a brass housing. There was a thin layer of scale inside the housing which was presumably stopping the vane from turning. A quick clean and a scrape and it's working just...

My Vaillant turbomax has just developed a fault (by no means its first!!) and I thought I'd seek some advice before shelling out my hard-earned! It has, out of the blue, started to be unwilling to provide hot water. The central heating side is fine but the diverter doesn't even flinch when...