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I get an error comand F17 at ThemaClasic F25 { Saunier Duval}?

Hi, can someone help me, I get an error at my ThemaClasic F25 { Saunier Duval} F17 ----? what does it mean ????
Radyk, January 2010
check voltage (u

julian, February 2010
F 17 = network voltage

cable guy :), January 2010
go to glow-worm web site you should be able to view all documents or phone 01773 828 300 for help

brian, January 2010