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Mend Ferroli HE31C Central Boiler

How can I make the central heating start?

What does the code d2 mean on the ferroli optimax HE31C combi boiler?
The hot water works well.
We have put the thermostat to 25 and 30 and the heat shows at 90 but then the central heating doesnt come on

celia askwith
November 2009
FerroliFerroli HE31CHeating, Home Heating SystemsCentral Ferroli Boiler

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