Lights 2 and 4 indicate pump blocked or pressure switch stuck on full.
If your machine has stopped full of water you'll need to unplug the appliance and pull it out.
Drop the drain hose into a bucket or wash basin, getting the hose as low as possible.
Raise the hose when you need to empty the container.
Once empty, take off the plastic cover beneath the front panel and check to see if your machine is fitted with a filter. If it is, put a shallow dish in front of it and slacken the filter, tighten it when you need to empty the container. Once empty, take the filter out and remove the debris, ensure nothing is left to foul the pump.
If there is no filter, take the rear panel off, take the hose off the bottom of the tub and take the pump out.
Clean the debris out of both, refit and try the machine again.
Hope this helps
Let me know how it goes or if you need more help.