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error 3 in Saunier Duval ISO FAST condens F35e ?

fault came up saying defect no 3 - for boiler Saunier Duval ISO FAST condens F35e - fwhat does this error mean and how can we resolve?
Jacqui McKinlay, December 2009
nothing found

Edvardas, December 2009
link Click here to see other fixes for Saunier Duval.