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what does FO mean on a combi boiler?

i bled a radiator fo has come up on the boiler what does it mean
margaret dempsey, November 2008
low water pressure in the system possibly.there should be a BAR reading/button or meter on the boiler.make sure its set to minimum recommended by manufacturer.as a guide 1.1 bar is average but check you manual for correct setting

plumber, November 2008