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Problem solved. For the record replacing the fan was the fix. £80 from UK heating supplies ltd

Thanks for the update. I hope you can hang on until you get it fixed. Does anyone have a reason (other than the fault code) for the fan being faulty.

Goose1, I had exactly the same problem on exactly the same day! Spooky, it's as though the Y2K bug arrived 10years late. Did you find a fix, i.e. fan or PCB? I've also come to the same conclusion in that the DHW system is fine, fan speeds up and boiler fires. But when a CH demand is...