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no hot water ferroli optimax 38?

New optimax 38 ferroli boiler has no hot water. Heating fine but fault code d1 and d2 on screen?

hd
September 2008
FerroliHeating, Home Heating SystemsHot Optimax Boiler Heating Fine
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

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