Ariston microGenus He 32 mffi?

my boiler shows no water pressure E 02 error code .correct code for no water pressure . fill up system with built in filling loop fine .Boiler works normally for abouts 20 mins while the pressure gradually drops then same message . whilst the pressure is dropping you can hear the water running out of the condensate flexi hose which discharges in internal waste pipe .this is all clear . Ive emptied the perspex condensate trap and filled back up with cold water for air lock but on running system fills up with warm water and all the water and pressure flows out freely into a bucket from the now diconnected flexi discharge pipe . It seems the water just immediately starts to discharge on pressurising the system out of this pipe as soon as the refilled system kicks in and temporary runs hot water or heating untill it drains out again and shows no pressure E02 error message . Boiler is about 1 and a half years from new install old