Hiya,
You have a blockage, most likely in the pump or a failed pump.
Unplug the appliance from the electricity supply.
If the drain hose is connected to a spigot under the sink check this for a blockage first.
Pull the machine out and lower the drain hose into a bowl or bucket. Raise the hose to stop the flow of water. Continue doing this until you get no more water out of the machine.
Put a tray or a couple of towels in front of the filter housing on the front of your machine and slowly release the filter, drain the remaining water out then remove the filter.
Take out the debris you find there and check that there is nothing in the pump stopping the impellor turning.
If there is no debris found, tilt the machine back about 45 degrees (assistance would be good at this point) and take the pump out of the machine, drop it through the bottom and remove the hoses. Check the hoses and the pump for blockages. If nothing found, use a multimeter to test the pump to see if it has gone open circuit and failed.
Reassemble the machine and try it again.
Hope this helps.
Thanks
Home Appliance Technician
Whitegoods engineer working for a multibranded national company in the UK.