Hiya, I live in a housing association flat and just moved in so set up my new washing machine. When I inserted my washing machine waste pipe into the standpipe it instantly overflows when draining, I have tried it in many positions like not bent in, not to deep in or deep in ect just incase it was me and checked for blockages but nothing I can see. I have attached pictures of under the counter to see if anyone can see the problem.
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