If the tank is empty, and sensor activation is not detected within the time set by parameter “Tmax fill”, the humidifier is not activated, rather the drain valve opens, after which there is a waiting time equal to the numberof minutes set by parameter “Restart wait” (Fc01, default 10), during the which is the message is shown on the display:Waiting (Restart: xx minutes) xx displays the minutes remaining until restart (starting from the value set for Fc01), after which there is another refill attempt. If this is successful,production restarts, otherwise there is a further “Restart wait (Fc01)” for the set number of minutes. The process is repeated until the sensor detects water is present. For the first two attempts, no alarm is generated, however if after the third attempt the procedure is not successful, alarm EF is generated, which is reset automatically when the humidifier detects water is present again. If the water fill cycle occurs