"Error i20 after several drain attempts"に関する回答I have the same error 20 problem recurring roughly every 6 months. The dishwasher was branded IKEA “FAVORIT 78000 VI1P” and manufactured by Electrolux. Thanks to the advice on this page I got myself a 100ml syringe together with tubing for €5: To rinse out the sensor, remove the bottom filter to expose the sump. There is a small tunnel at an approximately 10 o’clock position. With the tubing cut down to an appropriate length and inserted as far as possible into this tunnel, rinse liquid through forcefully. I use hot water with dissolved dishwasher tablet and repeat ca. 10 times for good measure. I normally see some gunk floating out after the first couple of rinses.