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I'm not intending to do any of this myself - just trying to understand it. The latest crowd were recommended by Vokera, so I will be getting them back to diagnose it properly.

No, local plumber last year, Vokera accredited firm this year.

Any suggestions please: After a short period of operation, burner switches off and boiler appears to lock-out on both CH and HW only setting. Flue diagnostic LED illuminates and status LED flashes. And then seems to auto-reset, start up, operate for 30 secs, then repeat - 10 secs off, 30 secs...