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my ferolli optimax hc 31 c boiler flashing a1?

my boiler is flashing a1 on screen pressure was high on 2 drained the valve to lower pressure now gone to 0 turned water pressure switch on to bring pressure back up now no water coming through & flashing fault f 21

jayne
February 2010
FerroliFerroli Optimax HC 31 CHeating, Home Heating SystemsBoiler Ferroli Optimax

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Free repair help for Ferroli Optimax HC 31 C home heating systems