Drain hose in floor drain but fills up water bucket

I have the drain hose going to a floor drain and the drain connector pointed down, but after a couple of days the water bucket fills up and shuts the unit down, why if the hose is going to a floor drain, and the drain connector is the way the instruction books says and then fills up the bucket and shuts down. The model I have is APE08AKM1. What would cause this to happen, there is no obstuctions I see on the outside or in the hose. Thanks and hope for you help and answer to this problem. Thanks Mike.....