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My system was drained down so I have refilled using the loop.I have also bled all the radiators.My Ferolli F24 boiler is showing a fault 03 code which is air. Is there an air vent on the boiler or do I keep bleeding the radiators. The hot water is running fine. Also the pressure clock is not...

Hi Gents,not used this forum for some time.I have moved in to a house where there is a ferolli DOMI Condens boiler fitted. The boiler is approx 2 years old. The previous owner has drained the system down. How do I refill it again. It also seems there is no air pressure in the vessel. Do I need...