After a limited use of 1/2 hour, the appliance displays "P1". I assume this is to empty the water via the drain, which is what I did. However, it's not sustainable to do this every 2 hours. Is this normal? Every 1/2 hours I have to empty the water from the lower pipe in the back as the P1 message is displayed on the machine. Is it normal? It cant be that you have to do this every 2 hours? Is it normal?