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what does f1 mean?

my boiler keeps cutting out everytime after pressing the reset button and then f1 appears. why is this?
lewis, December 2010
I guess it's a vaillant or gloworm boiler, most of the time the errors are wrong, especially when icy cold like we have currently. Try pouring hot water on you condensate pipe most likely frozen, boiler should then work

rawplumb, December 2010