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Mend Vaillant Ecotec Plus Fault Code Hot Water

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
VaillantVaillant Ecotec PlusHeating, Home Heating SystemsVaillant Ecotec Fault Code Hot Water
F64 = electronics/nct fault

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

T
May 2008

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Vaillant Ecotec Plus F64 Fault - Help!