However, if your boiler is more than 12 years old and the D6 error recurs weekly despite new wiring, the Vitotronic main board may be reaching end-of-life. At that point, compare the cost of a new board versus a partial boiler replacement—especially if other components like the fan or heat exchanger are also aging.
Any work involving the gas supply or internal electrical wiring must be carried out by a Gas Safe registered engineer . Viessmann Fault Code Checker viessmann d6 error
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