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Mend Ferroli HE31C Combi Boiler Error Code Central Heating

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 SystemsCombi Boiler Error Code Central Heating

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Ferroli 701Ferroli 77 FFFerroli COMBI 77 FFFerroli Combi 77FFFerroli Combi BoilerFerroli Domicompact F24BFerroli DOMINA 90Ferroli f24bFerroli F30Ferroli FalconFerroli Hawk 2Ferroli Modena 102Ferroli Optimax 25 CFerroli optimax 25CFerroli Optimax HE 31Ferroli optimax HE 31cFerroli Optimax HE 38CFerroli Optimax HE Plus 31 CFerroli optimax he plus 31cFerroli Optimax HE31c

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Free repair help for Ferroli HE31C home heating systems