Sorry, no answer. Same problem and got fobbed off by Argos customer care people. They sold what looks to be the same item under banner of Argos value range. I was told yesterday that they have discontinued selling the G2030ST and don't have any replacement filters. They tried to find the manufacturers information but told me they couldn't find anything. Draw your own conclusions. May be this fault we both have is one of the reasons Argos have discontinued it.
Elaine, January 2011