The following lists all error codes and their meanings for Tuttnauer Autoclave Series: 1730E, 1730EK, 2340E,2340EA, 2340EK, 2340EKA, 2540E, 2540EA, 2540EH, 2540EHS, 2540EK, 2540 EKA, 3870E, 3870EA, 3870EH, 3870EHS, EZ9, EZ10 ADD WATER This message is displayed when either the water level in the reservoir is below the Water Level Sensor, or if the Water Level Sensor malfunctions.… Read more