E3
LG Washing Machine
Severity: ModerateWhat Does This Error Mean?
The E3 error on an LG washer indicates a heating system fault. This appears when the wash water temperature sensor detects abnormal readings — either overheating, failure to reach the set temperature, or a sensor that is out of range. E3 is most common on LG front-load washers that have an internal heating element for hot water or sanitize cycles. A failed temperature sensor or heating element is the most likely cause.
Affected Models
- WM3700HWA
- WM4000HWA
- WM8000HVA
- WM3400CW
- LG front-load washers with internal heating elements and high-temperature wash cycles
Common Causes
- Water temperature sensor (NTC thermistor) has failed — sending readings outside the expected range
- Heating element has burned out or has an internal short causing abnormal temperature behavior
- Scale or limescale buildup on the heating element causing it to overheat before the water reaches the correct temperature
- Wiring fault in the heater circuit — broken wire or loose connector at the sensor or element
- Control board has a fault affecting how it interprets or controls the heating circuit
How to Fix It
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Power cycle the washer. Unplug it from the wall, wait 10 minutes, and plug it back in. A transient sensor spike can cause E3 as a one-time event. Try starting a cycle — if E3 does not return, a temporary fault caused it.
If E3 returns immediately or consistently on high-temperature cycles, the fault is real and needs proper diagnosis.
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Try running a cold or warm water cycle. If the washer completes the cycle without E3, the fault is specific to the heating system and only appears when the heater is activated.
This tells you the rest of the washer is working — only the heating circuit is at fault.
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Run a Tub Clean cycle with a washing machine descaler if you are in a hard water area. Scale on the heating element causes overheating. Descaling may resolve the fault if buildup was causing the element to overheat.
Use a citric acid-based washer cleaner or a commercial descaler. Run it on an empty hot cycle.
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Check behind the washer for any visible wiring damage or loose connections at the back panel. Heating element connections occasionally work loose from vibration over years of use.
If the wiring looks undamaged externally, the fault is likely internal — the element or sensor needs professional testing.
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Have a technician test the temperature sensor resistance at room temperature and the heating element continuity. A healthy NTC sensor shows a specific resistance that decreases with temperature. A failed element shows open (infinite) resistance.
On LG front-loaders, the heating element is usually accessed from the rear of the machine after removing the back panel.
When to Call a Professional
Heating element and temperature sensor replacement requires disassembling the washer. This is best handled by an LG-certified technician. Expect $150 to $300 for heating element or sensor replacement including labor.
Frequently Asked Questions
Is E3 on an LG washer a serious problem?
It depends on the cause. If it is a temperature sensor fault, that is a relatively simple and inexpensive repair. If the heating element has failed, replacement is more involved but still a standard repair. Neither requires replacing the entire washer.
Can I use my washer while it shows E3?
Yes — for cold or warm water cycles that do not require the heater. Avoid sanitize, hot wash, and steam cycles until the heater is repaired. For everyday laundry, a warm tap-water cycle works fine.
Does hard water cause E3?
Yes — limescale from hard water coats the heating element over time. This insulating layer causes the element to run hotter than the surrounding water. The temperature sensor detects abnormal temperature differences and triggers E3. Regular descaling prevents this.