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vaillent ecotec pro 28 boiler?

Its displaying f75 but as been working fine all week n this morning and now its not i cant afford to call an engineer out can i fix it myself
steph, January 2012
when you filled to 1.2 bar press restart X mark on flame sign

ltd, January 2012
f75 no water pressure in system,also air in system,water pressure sensor defective,in your case look like pressure is low fill water via filling loop right under boiler to 1.2 bar and vent rads

ltd, January 2012
link Click here to see other fixes for Vaillant ecotec pro 28.