Always unplug the washing machine from the electrical wall outlet before servicing. To test if a washer drain pump is bad, first check for physical obstructions by opening the front filter hatch and spinning the pump impeller blades manually; they should rotate smoothly with slight magnetic resistance without jamming on coins or lint. Second, unplug the electrical wire harness from the pump motor and use a digital multimeter set to ohms to test continuity across the electrical terminals. A normal pump motor will show a specific low resistance value, while an open circuit (infinite ohms or OL) indicates burned internal copper windings. Finally, verify power delivery by checking if voltage reaches the pump wires during a drain cycle.
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