When a residential washing machine smells like a sewer or rotten eggs, the issue is typically caused by plumbing gas leaks rather than the appliance itself. The most common cause is a dried-out P-trap in the wall drain standpipe, which fails to retain water and allows hydrogen sulfide sewer gas to vent into the room. Other causes include black organic slime and bacteria decomposing inside the internal drain hoses or a clogged plumbing vent stack. You can troubleshoot plumbing odors easily by inspecting drain traps. You can verify that your corrective action is successful when pouring water down the wall standpipe to refill the P-trap, cleaning the drain hose, and running a hot sanitizing cycle stops the sewer gas smell.
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