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whats the fault d2 on a ferroli boiler?

whats the fault for d2 on a ferroli optimax He 31c boiler we have no hot water but rads work
Lin law, July 2009
Hi
I have a ferroli Optimax 18kw OV boiler and I get this code too. It means there is a delay in the heat setting generally between hot water demand and heating demand. I think the setting is more common with combi systems.

Colin Rae, July 2009
link Click here to see other fixes for Ferroli.