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Hi Agile and thanks for the reply. There is no auto bypass fitted although I take it that this is something you would recommend. I can measure the flow and return temps although this is something I would have to do tomorrow. The boiler was matched to the rads and heating requirements of...

Hi, all the rads have TRV's apart from two which have lockshields but these lockshields are not fully open.

Hi All, Can anyone point me in the right direction for the following problem? My boiler (approx 9 yo) will run quite happily for several hours but then locks out (yellow LED), will reset and go thro it's ignition sequence but no spark, will not fire up and hence locks out again. If I leave the...