A strange, foul, or musty odor coming from a residential washing machine is typically caused by the accumulation of mold, mildew, bacteria, and decomposing organic soap scum inside dark, moist internal cavities. High-efficiency front-load washers are especially prone to this because airtight rubber door gaskets trap water, lint, and detergent residue, creating an ideal breeding ground for bacterial biofilms. Additionally, stagnant water in the lower drain pump filter can produce rotten egg smells. You can troubleshoot odors easily by inspecting rubber door folds and filter compartments. You can verify that your corrective action is successful when cleaning the door boot seal, draining the pump filter, and running a monthly hot cleaning cycle eliminates the strange smell entirely.
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