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How Do I fix?

Ferroli bioler optimax he plus 31 c
Fault light flashing F35
Boiler working fine
how do i get rid
colin w, October 2010
System needs water pressure topping up.
'Boiler working fine' won't be the case for too long unless you do so.

Carefree, October 2010
link Click here to see other fixes for Ferroli.