Most likely this is caused by an airlock in the water supply system. This issue can be easily solved by yourself.
Here is what we suggest doing:
1. Remove the water tank, fill it, and place it back.
2. Tilt the device in the direction of the water tank (lift the right side if the water tank is on your left) and then lower it down again after a few seconds.
If the issue is still not resolved, please, contact our Customer Support through the Technical Help Request Form.