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how can i fix my optimax HE 31c?

Got ferroli boiler optimax he 31c no heating or hot water but got a flashing F on front panel ! Any ideas ?

Tony
October 2014
FerroliHeating, Home Heating SystemsFerroli Boiler Heating Hot Water
Check water pressure fill to 1.5 bar filling loop is build in under boiler round black nob and liver ,refer to manual how to fill

ltd
October 2014

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