Hello, I have no background in DIY or repairs but my washing machine stopped draining and displayed an E20 error. Didn't notice any weird noises or anything and sounded like pump was doing something as normal. Some water drained initially then nothing. Checked ubend, checked waste pipe, (no filter on this machine), checked pump and pump filter thing - can't find a blockage anywhere. Does this mean my pump needs replacing? Don't want to waste money buying a pump if it's fine, but also don't want to pay for an engineer if the pump is the problem. Don't have the tools to test the pump and not sure how to tell if it's faulty. Any advice gratefully received.