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Error 3 is a draining problem here.
What you need to check is the drian hose and were it drains out to. If it goes under a sink take off the spigot and make sure this is clear.
If so then take out the pump again and there you will see the pump impeller X shape. Make sure theres nothing jammed up in there. It should ping round in stages. If its stiff to turn then the pump will need to be replaced.
Also you can check the black sump hose off going from the tub to the pump. As sometimes coins can get stuck in there as the hole is thin so coins dont always pass through.
Then once all thats clear retry the washer and see how it goes from there.
If you need anymore info just get back to me.