The printer does not have a physical sensor to detect how wet the pads are. Instead, it relies on an internal digital counter (the Waste Ink Pad Counter) that estimates ink accumulation based on usage.
The alternating red blinking lights should now be gone, and the power light should remain a solid green. Your digital counter is officially back to 0%. Epson L3256 Resetter
Click the button. The software will read your printer's firmware and display the current point count and percentage (which will likely show 100%). The printer does not have a physical sensor