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vaillant boilers sf6?

can anyone please help my boiler has been running perfectly for four years ansd all of a sudden iit stops the green light is flashing and when i press - & + i get the message sf6 please i am a man in desperate need

glyn
March 2009
VaillantHeating, Home Heating SystemsHelp Boiler Running Years
my boiller flashing green light no hot water or heating
error code sf6

siva
June 2016
You probably had it fixed by now but we got the same problem and 4 plumbers dont seem to have the answer.
Did you get it sorted and what was the problem

Steve
March 2010

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