Should be trapped at the bottom before it enters the main house drain. Should also be above the flood level rim of the washing machine tub. The proper size of the standpipe=1 and 1/2" I would call your plumber to inspect the trap and standpipe. If in fact raw sewage backed up into the washing machine, they may have a good reason not to honor the warranty. I'm sorry this happened to you, but it's best to have a pro inspect the drainage.
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