it could be the in line filter that gets missed so many timeson the return to the boiler
p david
February 2013
My fire bird c90 combi boiler keeps loosing presser and lets out water from the boiler
joe stephenson
September 2008
the only filter on your boiler will be cold inlet filter to stop debris entering the dhw side. if they have suggested a flush, then it'll be cos your system water is sludged up causing restricted flow and latent heat and possibly poor heat transfer in your boiler. radiators cold at bottom, maybe some not working properly.???
iain
July 2008
wont be just the boiler it will be the system thats dirty..sounds as its a farly new boile
c
July 2008
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