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What is F15?

We have lost our manual for the ferroli optimax he31c and are having problems (eg nothing working). It is coming up with fault F15. CAn anyone tell me what this is and how to rectify it.
Thank you

Beverley Luty
March 2008
FerroliHeating, Home Heating SystemsLost Working Fault
f15 is a fault code.go to:www.ferroli.co.uk the pdf should help.

john
March 2008

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