Pull the machine away from the wall to check for kinks or sharp bends. Disconnect the hose from the back of the washer and run a high-pressure stream of water from a garden hose through it to force out debris. How to Unclog Washing Machine Drainage Pipe

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Water remains in the drum after the cycle finishes, or the machine stops mid-cycle with an error code.

These are the primary culprits, especially in older homes with narrower pipes.