Washer Not Draining: Causes and How to Fix It
Updated · from manufacturer service documentation
A washer that won't fully drain within about 10 minutes usually has a drain hose installed at the wrong height, a failing drain pump, or a pressure switch giving a false reading — service documentation across LG and GE points to the same handful of causes, and one of them (drain hose height) is purely an installation issue with no parts involved.
What Causes a Washer Not to Drain
| Cause | Likelihood | DIY difficulty | Related part |
|---|---|---|---|
| Drain hose not at the correct height (must be 0.9–1.2 m / 36–46 in above the floor) | Common | Easy — reposition hose | Drain hose |
| Load too small, tilted machine, or laundry gathered to one side delaying drain/imbalance detection | Common | Easy — redistribute load, check leveling | — |
| Drain pump resistance out of spec (worn/failing pump) | Less common | Moderate — multimeter | Drain pump |
| Pressure switch reads outside normal frequency range (false "won't drain" reading) | Less common | Moderate — test mode + multimeter | Pressure switch |
| Main control board fault | Rare | Pro repair | Main PCB |
How to Fix a Washer That Won't Drain, Step by Step
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Check the drain hose height
Per LG's service documentation, the drain hose must be inserted into a standpipe or drain 0.9–1.2 m (36–46 inches) above the floor — too low or too high a discharge point is a documented cause of drain problems, and it's a pure installation fix, no parts needed.
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Check the load itself
LG's error-condition documentation ties fill/drain timing issues to small loads, a tilted machine, or laundry gathered to one side — spread the load evenly and confirm the washer is level before assuming a mechanical fault.
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Confirm the "not fully drained" timeout
LG's documentation defines the drain fault as water not fully draining within 10 minutes — if your washer is close to that window rather than not draining at all, a partial restriction (not a dead pump) is more likely.
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Test the drain pump resistance
With the washer unplugged, drain pump resistance should read approximately 13.2 ohms (documented on the GE platform) — compare to your model's spec; a reading far outside normal points to a failing pump.
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If the drain error appears even though water is actually draining normally, check the pressure switch
In test mode, with the tub empty, LG's documentation gives specific frequency thresholds: a reading below 26.3 kHz points to a defective pressure switch; a reading between 26.3 and 27.1 kHz points to a defective main board instead. This is the fix when you can visibly confirm water is leaving the tub but the error still displays.
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If none of the above resolves it, the main control board may be at fault
This is the point to bring in a technician, since board-level diagnosis needs the test-mode access covered in Step 5.
Where This Comes From
Cross-referenced from GE's GTW750 (2018) top-load service documentation and LG's top-load (MFL40322141 series) and front-load (WM0642) service manuals — installation height requirements, load/imbalance interaction with drain timing, pump resistance specs, and the pressure-switch false-positive diagnostic all appear independently across these sources.
Brand-specific pages: LG washer OE, Samsung washer 5C.
Frequently Asked Questions
Why does my washer show a drain error even though the water actually drained?
This is a documented false-positive scenario tied to the pressure switch reading an incorrect frequency — testing the switch in test mode with an empty tub identifies whether the switch or the main board is the real cause.
Does the height of my drain hose really matter?
Yes — LG's service documentation specifies the drain hose must discharge between 0.9 and 1.2 meters (36–46 inches) above the floor; installing it too low or too high is a documented cause of drainage problems with no pump or part involved.
Can a small or unbalanced load cause a drain error?
Yes, indirectly — LG's documentation ties fill/drain timing faults to small loads, a tilted machine, or laundry bunched to one side, since these affect how the washer senses water level and load state during the cycle.
How long should draining actually take?
LG's documentation defines the fault threshold at not fully draining within 10 minutes — if your washer is draining slowly but within that window, the issue is likely a partial restriction rather than a dead pump.
Based on the GE GTW750 (2018) service documentation and the LG top-load (MFL40322141) and front-load (WM0642) washer service manuals. Last updated: .