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Mend Ferroli Optimax HE plus C (38kW) Boiler Fault Code Heating

Fault Code A42 - not in manual?

I have a Ferroli Optimax HE plus C (38kW) which has locked out showing fault code A42. This code is not listed in my manual, and pressing reset does not cure the fault. Has anyone any idea what this code means?

David
December 2011
FerroliFerroli Optimax HE plus C (38kW)Heating, Home Heating SystemsBoiler Fault Code Heating

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Free repair help for Ferroli Optimax HE plus C (38kW) home heating systems