Can you post the model number of the appliance please?
OK, thanks for that.
When it should drain do you hear a buzz or hum from the pump?
Drain the water out manually again, take the filter out and put the machine on a drain or spin programme, listen at the open filter housing to see if you can hear the pump.
Sorry, I'm looking for information on the pump.
If it didn't empty, the first part of the problem is the pump.
From the sound of it, it would suggest that something is in the pump jamming it.
Unplug the appliance and turn the water to it off.
Disconnect the water hoses if necessary.
Lay the appliance over onto it's left side (viewed from the front) and onto a low support so it's about 45 degree angle.
The drain pump is attached to the filter housing.
Look underneath the machine and you'll see the clips coming through the plastic base that hold the housing.
Squeeze the clips and push them into the plastic base a little.
You can now slide the pump out of the housing.
Clear the blockage/jam and then refit the pump.
Push the housing back down until the clips lock into the base again.
Stand the machine back up, restore the water and power.
Try the machine again.
Hope this helps
Let me know how it goes or if you need more help.