Whirlpool Dehumidifier Continous drainage. Drain hose on top in rear What is second port on bottom

SOURCE: Connecting a drain hose

Most units have a drain connection, either on the machine itself, or in the collection pail. These connections usually fit standard garden hoses.

SOURCE: Hose Drainage

yes, that is what the knockout port was designed for. Make sure the hose you get does actually thread onto the hose connection port before you punch out knock out. The hose should be a standard garden hose connector.

SOURCE: haier 30 pint dehumidifier continuous drain problem.

Many just attach the hose at the reservoir; from your description, Haier apparently has a separate location. Check that the point that the hose attaches has an opening (many don't, they expect you to drill it). It should then drain through gravity. Check to make sure that no part of the drain hose is higher than the bottom of the reservoir, otherwise it can't drain. It won't siphon because each time the the tank empties, the suction is broken and the siphoning can't continue.

SOURCE: Dehumidifier

Hey ya! To fix this u need to block that hose connection under the Dehumidifier. This will then re direct the flow to the Bucket collection mode. I have the same problem and resolved it this way after pullng mine apart. It looks like by default that hose connection at the bottom should have a plug/cap on it and after turning on ur dehumidifier this fills up then once full it starts to over flow into the bucket... Seems a strange design but thats how they have done it.

Hope this helps others.

SOURCE: Whirlpool AD50USS Dehumidifier WILL NOT DRAIN THROUGH HOSE

I have a similar model. There are two drains, one for the hose and one directly into the bucket. The hose one is supposed to be lower, but I had to put a 3/8 inch block under the right side of the unit to get the water to favor the hose instead of the bucket. Another possibility is that the far end of the hose is higher than the near end. If you can't lower it, you can put the whole dehumidifier up on blocks. One other thing to check is that the hose has a rubber washer in it where it connects to the unit. Use a tissue to see if this connection is dry. If it leaks, it will just drip into the bucket.
Good luck!