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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
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
link Click here to see other fixes for Ferroli.