How do I install the drain to my haier dehumidifier?

https://www.manualslib.com/manual/370276/Haier-Hdn305-30-Pint-Capacity-Dehumidifier.html

Haier HDN305 30 Pint Capacity Dehumidifier User Manual

Did you punch out (or cut) the plug that the hose connects to? If not, its blocking the water from draining to the hose.

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Turn the ON/OFF Switch to OFF and unplug the unit for 15 minutes.
Once the time has elapsed, plug the unit in and turn the unit ON.

Hopefully, during that 15 minute timeout, the electronics reset and reverted back to the original factory settings. And the unit will turn ON when you press the ON/OFF Switch.

It's also a good idea to check the outlet it's plugged into. It very well could be an issue with the outlet (no power) or the circuit breaker for that outlet has tripped.

If you continue to have a problem getting it started, contact LG Customer Support 1-800-243-0000.

The line may have "gunk" built up in it. I would suggest checking the drain line to make sure it is not blocked.

check the hose connection,when new these units have a knock-out plug where the hose goes so if your only going to use the bucket and not the hose it wont run out the hose connection

What does an E2 code mean?

I have a Haier Dehumidifier that is about a year old, I emtied the bucket and put the bucket back into place and hit the start button and nothing happen I unplugged the unit and error code E2 keeps comming on

please make sure the unit is leveled.also make sure the hole in the drain pan not clogged.also the size of the hose must be fit the hole not smaller

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.