i also have a kenwood steam generator, the light came on for me to replace the filer, which i did, and it took a few uses for the light to go out, but it did eventually,
also, i have a tip. dont throw the old filter, as i opened it (just pop the top off using a small screwdriver) then i laid all the contents onto a metal baking tray, and left in sun on window bottom to dry out, once dry carefully pour the (iron filings like) contents back into the filter, and replace the lid, i have now used this filter, and its been working for around a month perfectly,
C Byrne, October 2009