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vaillant ecotec 24 going to f75?

i have a vaillant ecotec 24 woke up in morning turn boiler on wont start keeps coming up f75 can any body help please.......
bobandjan80, June 2010
but also pressure sensor in boiler will cause this fault, make sure black rubber tubes in boiler are not blocked

habitmush, June 2010
Always the pump

boilerman, June 2010
link Click here to see other fixes for Vaillant.