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how to fix d1 error on a ferroli optimax he 31c boiler?

d1 error message keeps coming up after running hot water on a ferroli optimax he 31c boiler
eric, February 2011
d1 is not a error it is when the hot water has reach the correct temperature.you will also see d2 which is the central heating reaching temp.cheers

MARK, February 2011
link Click here to see other fixes for Ferroli.