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Mend Combi Boiler Bled

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
Heating, Home Heating SystemsCombi Boiler Bled
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

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Combi Boiler Showing FO - Meaning & Fix