Open the utility and click "Read waste ink counters" to confirm that the overflow counter is indeed at 100%.
Sometimes, temporary glitches can lock the printer. While it rarely resets the actual waste ink pad counter permanently, this hardware power cycle can clear stubborn queue errors: Turn off the printer completely. epson et 2400 reset work
Some older Epsons allow a button-mashing reset. On the ET-2400, this is , but try it if you’re stuck: Open the utility and click "Read waste ink