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Washer won't drain — water sits in drum after cycle
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⚠️ Possible |
Clogged filter (60–70% of cases), kinked drain hose,
siphoning
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Clean filter FIRST — this resolves most cases
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| Pump hums but no water drains |
✅ Very likely |
Debris jammed in the impeller, limescale-locked impeller,
seized pump motor
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Clean filter; if pump still hums without draining, pump is
jammed
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| Pump runs and drains slowly |
⚠️ Possible |
Partially clogged filter, kinked hose, limescale restriction
in pump or hose
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Clean filter; flush hose; if flow is still weak, impeller
may be worn
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Pump is silent (no hum) during drain cycle
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⚠️ Possible |
No power to pump (control board fault), wiring fault,
thermal overload
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Test voltage at pump terminals during drain — no voltage =
board fault
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Grinding or rattling noise during drain
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✅ Very likely |
Debris in pump impeller (coins, bra wire, hair clip)
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Clean filter; if noise persists, remove pump and inspect
impeller
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Continuous humming during drain; drum fills with water
instead of draining
|
⚠️ Possible |
Siphoning (drain hose installed too deep), pump running
backwards (rare)
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Check drain hose depth (max 4 in / 10 cm)
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Water on floor beneath washer during drain
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✅ Likely |
Pump seal failure, loose pump housing connection, cracked
pump body
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Inspect pump housing for leaks; check hose connections
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Washer stops mid-cycle with water in drum
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⚠️ Possible |
Clogged filter, failing pump, control board fault
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Clean filter first; then test pump
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| Musty smell from washer |
⚠️ Possible |
Stagnant water in pump housing, biofilm in pump
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Clean filter and pump housing; run Tub Clean cycle
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Error code indicating drain fault (LG OE, Samsung 5E/5C,
Bosch E18/E20, Whirlpool F21)
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⚠️ Possible |
Filter, hose, or pump — in that order
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Clean filter; check hose; then test pump
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Pump runs for a few seconds, then stops (repeats)
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⚠️ Possible |
Pump thermal overload tripping, control board reset
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Pump may be overheating — test voltage and current
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Washer drains but not completely (residual water remains)
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⚠️ Possible |
Partially clogged filter, weak pump, drain hose depth
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Clean filter; check hose; then pump
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Washer won't spin (drain-incomplete interlock)
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❌ Not the pump alone |
Filter, drain hose, or pressure switch — pump may be fine
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Diagnose drain system before condemning pump
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Washer fills but never drains — completely dead drain
function
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⚠️ Possible |
Control board not sending drain signal, pump failure
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Test voltage at pump during drain cycle
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Washer is new (under 2 years) and won't drain
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❌ Usually not the pump |
Installation error, kinked drain hose, shipping debris
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Check drain hose and installation first
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Washer vibrates excessively during drain
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⚠️ Possible |
Loose pump mount, debris in impeller causing imbalance
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Tighten pump mount; clean pump |
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Water drains directly to floor instead of drainpipe
|
❌ Not the pump |
Drain hose disconnected from drainpipe
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Check drain hose connection at the drain
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