no water error

If this error occurs within the first few minutes, it means that the water level sensor did not detect water within the first three minutes of the beginning of pump activity.  This could be due to a lack of water delivery to the chamber from the reservoir or a leak (such as an incomplete door closure). It could also mean that there is an obstruction in the water delivery path, such as an occlusion at the white filter located between the reservoir and the pump or at the strainer at the rear of the unit. Another possibility might be if the solenoid located at the back of the reservoir does not open/energize during the filling process, then the unit is attempting to pump water into the chamber against a backpressure. Finally, if the unit is being "short cycled" ie: beginning a new cycle within 20 minutes of a prior cycle completion, then it is possible to overheat the water pump (due to pumping hot water from the reservoir as a result of the heating effect of the condensing coil from the prior cycle) and cause intermittent failure and/or water pump damage.

The foregoing assumes that you have the unit properly levelled, the correct water inlet time programmed and the door closing device tightened sufficiently.

If the error occurs during the heating or sterilizing part of the cycle, you have a different issue: whatever water was correctly dispensed from the reservoir into the chamber was either refluxed thru a leaky solenoid back to the reservoir, the door bellows is leaking or, most commonly (especially with multiple operators) the door closing device is insufficiently tightened allowing steam to escape (subtle) and stop the pressure rise prior to reaching the set point.

Good luck