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error code ff05 with isofast f35?

I have the Saunier Duval Isofast f35 e1 boiler . While trying to have hot water for the first time this winter, the message ff 05 appeared. What can i do to fix it?
Katerina HB, October 2011
link Click here to see other fixes for Saunier Duval Isofast f35.