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Vailant Ecotec Plus fault code?

My boiler is coming up with the code of F64. I run the hot water, it stays hot for a minute, then goes cold as boiler stops working, please help!!
Marcus Ashley, May 2008
F64 = electronics/nct fault

either a flow or retun thermister has gone faulty and needs replacing or possibly a pcb problem

T, May 2008