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The unit should start draining then filling when you start it.
Any flashing lights or fault codes?
Okay the humming is either the drain pump is jammed, faulty or possible water in the base.
Pull the unit out in the floor and tilt it back 45 degrees to let any water in the base drain out. Replace the unit and try again.
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THe drain pump most likely is going bad and will need to be replaced. Could also be a faulty water inlet valve.