Whirlpool WTW8900BC0 Drain Pump — What Part Fixes Drain Problems?
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Understanding the Problem
Brief explanation: The drain pump on the Whirlpool WTW8900BC0 removes wash water from the tub during drain and spin cycles. When the pump fails (electrically or mechanically) or its inlet/outlet is blocked, the washer won’t drain, may show drain-related error codes, hum without moving water, or make loud grinding noises. Step-by-step diagnostic and repair instructions: 1) Verify symptom and error codes - Confirm the washer won’t drain or shows an F02/F06 or similar drain-related code. Note any humming or loud noises during drain attempts. 2) Preliminary checks (fast, no tools) - Unplug the washer or switch off the breaker. Turn the water off for safety if you’ll move hoses. - Remove the fill hoses and check the drain hose for kinks or blockages. Ensure the standpipe or sink drain isn’t clogged. - Check the washer’s coin trap (if present) or the drain hose elbow for lint, coins, or debris. 3) Access the drain pump - This top-load model’s pump is located at the bottom of the washer. You can access it by: removing the lower front access/toe panel (clips or screws) OR by tipping the machine back and removing the rear access panel—consult your service manual for position if uncertain. - Place towels and a shallow pan under the pump area to catch residual water. 4) Inspect for blockages and impeller freedom - With power disconnected, locate the pump and remove the small inlet/outlet hoses (spring clamps or worm clamps). Drain the water into your pan. - Inspect the pump impeller through the opening. Manually spin the impeller: it should turn freely and return without grinding. Remove any foreign objects. 5) Electrical check (multimeter) - Disconnect the pump’s electrical connector. Set a multimeter to the ohms (Ω) range. - Measure resistance across the pump motor terminals. A typical working small washer pump will show continuity (some tens to a few hundred ohms). An open circuit (infinite) means the motor winding is burned — pump needs replacement. Note: Exact resistance varies by pump — the important check is that the circuit is not open. - Also check for voltage at the connector while running a drain cycle (only if you are comfortable and safe handling live testing). If voltage is present but the pump doesn’t run, pump is bad. If no voltage, the problem may be control board, lid switch, or wiring. 6) Remove the old pump - With power off and water drained: loosen and remove the hose clamps, pull hoses off the pump. Remove the mounting screws or clips that secure the pump to the washer chassis. Note pump orientation and any gasket placement. - Remove the pump and compare the new pump to the old to confirm fittings and harness match. 7) Install the replacement pump - Install pump in same orientation. Reinstall mounting screws/clips. Reattach hoses and tighten clamps securely (avoid overtightening plastic hose fittings). Reconnect electrical connector. - Replace any panels removed and secure the washer into position. Reconnect water and power. 8) Test - Run a drain/spin or drain-only diagnostic cycle. Observe for normal water removal, listen for smooth pump operation, and check for leaks around hose clamps. Safety note: Always disconnect power (unplug or flip the breaker) before accessing electrical components. Use eye protection and gloves when working with water and tools. If you are not comfortable performing electrical tests or working under the machine, hire a qualified technician.
Common Symptoms
Washer won’t drain or spin, standing water in tub, drain-cycle error codes, pump hums but does not move water, loud grinding or knocking from the base, leaks at pump/hose connections.
Common Causes
- Clogged inlet/outlet or trapped foreign object jamming the impeller
- Pump motor electrical failure (open windings or burnt motor)
- Wiring/connectors or control board not sending power to the pump
Popular Parts That Fix This Problem
These are the most common replacement parts that fix this problem. When you're ready to order, click below to find the right part at ProsourceParts.com — just search by your appliance model number for a guaranteed fit.
Helpful Repair Tip
If the pump hums when commanded but there’s no water movement and the impeller won’t spin freely, the impeller is likely jammed or the motor bearings have failed — replace the pump. If the pump shows open circuit on a multimeter, replace it.
Frequently Asked Questions
Can I run the washer without replacing the pump if it's making noise?
No. A noisy pump is often failing and may seize, leak, or overheat. Running the washer with a failing pump risks further damage to the tub, motor, or electronics. Replace the pump or clear the obstruction before normal use.
How long does it take to replace the drain pump on this model?
For a competent DIYer with basic tools it's typically 20–45 minutes (draining, removing front/lower panel, swapping the pump, and testing). If access requires more disassembly or you’re unfamiliar with appliance work, allow an hour and consider professional help.
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