Hello, We have a situation in regards to our sewer drain that the washer drains into. We have been in this house for 5 years and we never had a sewer odor from the washer standpipe. We purchased a new washer ~1 year ago and we notice sewer gas coming from the standpipe after the washer runs a load. We either have to pour water down or remove the washer drain line and plug it up with a old rag to prevent the odor from coming out. The washer is on our main level and there is a crawl space below. I have went in the crawl space and verifified that there is a P trap on the line. I have went on the roof and snaked the vent and there is no blockage. I even ran water from the garden house down the top of the vent while in the crawl space and can hear the water running in the lines. It is almost as if the trap is not holding water, but there is no leaking from the line. The trap is about 40 inches from the top of the standpipe. The washer discharge line only extends into the standpipe about 6 inches, so there is at least another 34 inches of straight pipe until it reaches the trap. The drain line doesn't back-up or overflow. I am starting to think that the washer discharges much more water quicker than the old washer and it is somehow creating a siphon on the trap? Not sure if that is common or not and if so, how to correct it. Any advise or insight is greatly appreciated. Thank You, Nick

Hi. If I turn on the cold water in my bathroom sink, after a couple seconds, it sputters and vibrates very loudly. If u let it go, then the water keeps sputtering and then less comes out. If u have the hot water on with it, it doesn't happen. But when I had both hot and cold running while someone was in the shower, I heard banging pipes in the shower. If just the hot was on, it didn't happen .