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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
link Click here to see other fixes for Ferroli Optimax HE plus C (38kW).