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Mend Ferroli optimax 25c Boiler Heating Error Code

ferroli optimax 25c boiler?

what does the letter d mean on the display

steve
November 2008

Ferroli Ferroli optimax 25c Heating, Home Heating Systems Boiler Heating Error Code

delay following operation

solheat
December 2008

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Ferroli Optimax 25C Boiler - Error Code D