Whirlpool WTW8900BC0 Washer Drain Pump — What It Does & How to Diagnose / Replace
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Understanding the Problem
The drain pump on the Whirlpool WTW8900BC0 removes water from the tub during drain/spin cycles. When the pump fails or is blocked, the washer won't drain or may make abnormal noises. Below are step-by-step diagnostics and repair steps to find and fix drain pump issues. 1) Verify the symptom: If the washer stops with water in the tub, shows a drain error, beeps, or spins but water remains, it's likely a drain/pump or a blockage. Note any humming, grinding, or loud squeals when the drain should run. 2) Preliminary checks (quick and cheap): - Run a drain/spin cycle and listen. A humming motor without water flow often means a seized or electrically energized-but-blocked pump. - Inspect the drain hose (rear of washer) for kinks or clogs. Remove and feed water out into a bucket to check flow. - Clean the small mesh screen/coin trap if your model has one (some top-load Whirlpool models have a small accessible trap). Caught debris will stop flow. 3) Prepare to access the pump: - Unplug the washer and turn off water supply. Move the washer away from the wall to access the lower front or rear depending on model. - Place towels and a shallow pan under the pump area to catch residual water. 4) Visual & manual inspection: - Remove the lower front access panel (usually held by a few screws) or the rear access panel if your unit positions the pump at the back. - Locate the drain pump: a small plastic housing with an electric plug and rubber drain hoses. Inspect hoses and hose clamps for splits or blockages. - Remove the clamp on the pump outlet hose and direct hose into bucket to check for free drainage. - Spin the pump impeller by hand (if accessible). It should turn freely; if it’s jammed or gritty, remove debris or replace the pump. 5) Electrical testing (to confirm pump motor fault): - With the unit unplugged, disconnect the pump electrical connector. - Use a multimeter set to resistance (ohms). Measure between the motor terminals: a healthy motor typically shows continuity (often a low to moderate ohms reading). An open circuit (OL) indicates a failed motor winding. - Check for continuity to ground/earth: there should be no continuity between motor terminals and the pump housing (no short to ground). 6) Replace the pump (if failed or irreparably jammed): - Note orientation and wiring positions, then disconnect the electrical plug and remove hose clamps on both inlet and outlet hoses. - Unfasten mounting screws or clips that secure the pump to the washer cabinet. Remove the pump. - Transfer any rubber gaskets or mounting brackets to the new pump if required. - Install the new pump, tighten screws, reattach hoses with clamps (ensure snug, not over-tightened), and reconnect the electrical connector. - Reinstall the access panel, reconnect power and water, run a drain/spin cycle to check for leaks and proper drain operation. 7) Final checks and testing: - Watch a full drain cycle; ensure water is being pumped out and the pump does not make unusual noise. - Inspect all hose connections for leaks during the cycle. Safety note: Always unplug the washer before opening panels or touching electrical parts. Use gloves and eye protection when handling used hoses and trapped debris. If you’re not comfortable accessing internal components, hire a qualified appliance technician.
Common Symptoms
Washer won't drain, water remains in tub after cycle, loud grinding or humming from bottom front, error codes related to drain, or leaks from pump area.
Common Causes
- Debris (coins, lint, socks) jammed in the pump impeller or inlet/outlet hose
- Failed pump motor (electrical winding open or shorted)
- Blocked or kinked drain hose or clogged household drain
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Helpful Repair Tip
If you hear the pump humming but no water exits, disconnect the outlet hose into a bucket—if water flows freely, the pump is likely OK and the blockage is downstream (hose or house drain). If the pump doesn't spin freely by hand or shows open circuit on a multimeter, replace the pump.
Frequently Asked Questions
How much does a replacement drain pump cost and how long does replacement take?
A new Whirlpool drain pump typically costs between $35–$120 depending on supplier and OEM vs aftermarket. Replacement time for a competent DIYer is about 30–60 minutes (access, remove hoses, swap pump, test). Allow extra time if you need to move the washer or deal with stubborn clamps.
Can I clean the pump instead of replacing it?
Yes — if the pump is electrically healthy and simply jammed with debris, cleaning the impeller and hoses often restores function. If the impeller is broken, the housing cracked, or the motor shows no continuity, replacement is recommended.
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