E4
LG Washing Machine
Severity: ModerateWhat Does This Error Mean?
The E4 error on an LG washer indicates a water overflow or overfill condition. The water level inside the drum exceeded the maximum safe level. This can mean the water inlet valve is stuck open and cannot stop filling, the water level pressure sensor is faulty, or there is a problem with the pressure sensor hose. E4 is a safety stop — the washer halted to prevent water from overflowing onto your floor.
Affected Models
- WM3400CW
- WM3700HWA
- WM4000HWA
- WT7300CW
- LG front-load and top-load washers with water level monitoring
Common Causes
- Water inlet valve is stuck open or leaking — continues to let water in after the fill target is reached
- Water level pressure sensor has failed — incorrectly signals that the tub is empty when it is actually full
- Pressure sensor hose is kinked, cracked, or disconnected — faulty air pressure reading causes incorrect water level reporting
- Excessive foam from too much detergent can fool the pressure sensor into misreading the actual water level
- Control board relay for the inlet valve is stuck closed — valve stays open even when commanded to close
How to Fix It
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Cancel the cycle immediately and check that water has stopped entering the machine. If water continues to flow into the drum even though the washer is stopped, the inlet valve is stuck open — turn off the water supply taps behind the washer right away.
A stuck-open inlet valve is a flooding risk. Turn off the water supply as a first priority if water keeps entering.
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Drain the washer using the Drain/Spin cycle or by lowering the drain hose into a bucket. Once the drum is empty, try running a short cycle to see if the water level is monitored correctly.
If the machine stops again immediately with E4, the fill system cannot regulate water level and needs repair.
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Check the amount of detergent used. Using too much detergent — especially non-HE detergent in an HE washer — causes excessive foam. Foam mimics water in the drum and can confuse the pressure sensor into triggering an overflow error.
Always use HE (High Efficiency) detergent in LG HE washers. Use only the recommended amount — often far less than you think.
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Locate the pressure sensor hose. This small clear or rubber hose runs from the bottom of the drum tub to the pressure sensor on the control area. Check for kinks, cracks, or disconnected ends. Blow gently through it — it should pass air freely.
A kinked or cracked pressure hose sends wrong water level data to the control board, causing E4 even when the tub is not overfilled.
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If the water supply is confirmed off and the hose is intact, have a technician test the water inlet valve and pressure sensor. The valve may need replacement if it cannot close fully, or the sensor may need replacement if it reads incorrectly.
Both parts are relatively inexpensive — valve replacement resolves most E4 issues.
When to Call a Professional
Water inlet valve replacement and pressure sensor testing are tasks for an appliance technician. A stuck-open valve can flood your laundry area if not fixed promptly. Expect $100 to $250 for valve replacement or $80 to $150 for a pressure sensor at a shop.
Frequently Asked Questions
Is E4 the same as FE on LG washers?
Yes — E4 and FE both indicate an overflow or overfill condition. Older LG models display E4, while newer models show FE for the same fault. The diagnosis and fix steps are the same for both codes.
Can E4 cause water damage to my home?
It can — if the inlet valve is stuck open and the machine does not stop filling, water will eventually overflow the drum. The E4 code triggers a safety stop, but if the valve is truly stuck, water may continue entering even after the machine halts. Turn off the water supply taps immediately if you see water still entering the drum after E4 appears.
Can too much laundry cause E4?
Not directly — E4 is about water level, not laundry volume. However, an overloaded drum combined with excess foam from too much detergent can create conditions that confuse the water level sensor. Always load the drum correctly and use the right amount of detergent.