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Sorry, I've been a bit silly. The boiler is indeed a 428 (NOT an 824) so maybe the gas valve minimum setting matters. Peter

Thanks for the comments . . Not quite sure what you mean by 'full output' yes the whole system was powerflushed, but I'll try your filling loop suggestion. Also thanks for the gas valve comment. I'll ask the installer to adjust the gas valve. I must say that when I eventually got to speak to...

My Eco Tec 824 is only days old, but exhibits a very loud vibration (flame ignition noise?) only when it fires up. It lasts for about 5/6 seconds and only seems to happen after it has cooled (say 60 secs from previous ignition.). My corgi installer is puzzled but has no solution . . anyone help...