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f75 ecotec pro fault?

my vailant ecotec pro boiler comes up with f75 problem on it any udeas what could be causing this fault
skippylou, April 2012
Fill to 1.2 bar make sure no air in system

ltd, April 2012
Change water pressure sensor ,to do drain system,replace new one ,fill via filling loop,take air out from pump and radiators

ltd, April 2012