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Re: Vaillant turbomax 828E - four years old. When boiler turned on the green light flashes. When hot water tap turned on status mode indicates 1/ ignition sequence (warm start) then 2/ S13 ignition sequence (hot water operation. The boiler makes hopeful noises then displays 3/ S33 check...

i've got a 4 year old turbomax plus 828E boiler - in the last two weeks it's struggled to give hot water, fault code says S33 "check air/flue system" there's no blockage in the flue.Could there be air trapped in the system or could it be the electronic control board playing up? If thats the case...