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Mend Viessmann HE 25C Heating Repair Hot Water

how can I fix optimax HE 25C hot water?

we have a optimax h e 25c fault D appears what does this mean

Roger Rundle
August 2009
ViessmannViessmann HE 25CHeating, Home Heating SystemsHeating Repair Hot Water
not a clue, only A & F codes are listed for this boiler. give ferolli a ring.

Ian
August 2009

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Viessmann Optimax HE 25C Fault & Repair