ferroli optimax

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think i had that the other week on a new c31. no fault code in the book.just reset and that was that.if i remember f codes dont exist in the manual.i put i down to overhaet due to re topping up after flush through. and not priming the pump.
 
just had a quick look and ferolli MIs do have f codes for the c31. pretty sure i had a code that wasnt in the booklet.anyway i see f12 isnt in there either. id check the wiring harnesess.
 
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customer said his heating wasnt on but his hot water was working then he pushed some buttons on the front and now f12 wont go off no matter what you try.
 

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