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Ferroli Optimax HE 31 ?

wot dose f 15 means plese

alan
October 2012
FerroliFerroli Optimax HE 31Heating, Home Heating SystemsFerroli Optimax He 31
my combi boiler is showing t5 and 42 not heating up

donna
November 2012

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Ferroli Optimax HE 31 - Error Code F15