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ecotec F75 fault?

I have a ecotec valliant boiler it is showing F75 fault how do I repair it.What does it mean?
zeban shah, February 2010
You need to refill with water to raise the pressure. This site has a great video that shows you how. http://www.biggerheat.com/Boilers/Vaillant-Boilers/

JW, February 2010