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f 05?

i am getting this f o5 sign on screen.what does that means?and how can i fix this probllem?
ms saran, August 2007
I am guessing that you have a vaillant pro 18 or 28, if this is the case then it has overheated and needs to be opened up to reset.
if this is not the boiler then let me know.

gary.wright53@googlemail.com, August 2007