I've never had this problem before, possibly because printers have always broken after about a year. Apparently the ink absorber is full and I need to contact the (non existent) service centre. This is obviously something to do with waste ink. Is this something I can sort out myself with a hosepipe or something less drastic, or do I buy a new printer?
The current one is a Canon Pixma MX300 and it seems to be working perfectly still despite the error message.