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Would it be a case of changing the cartridge or would the system also need a flush out! Not sure which cartridge to order there are so many.

Hi all first post was hoping for some info into this fault. The system runs fine with no faults on the Potterton Powermas HE85. The problem is that even if you only want hot water you get radiators aswell. I have watched the divertor valve as it switches in and it appear to be locked in the CH...

Divertor valve actuator