How to Replace an LG Washer Temperature Sensor
An LG washer that shows a tE code, never heats, or heats without stopping has usually lost its temperature sensor — a small thermistor in the tub. Swapping it is a beginner job of about 15 to 20 minutes.
The thermistor is a resistance sensor whose value changes with temperature, and the control board reads it to judge the water temperature and run the heater. On most LG front-loaders it sits low in the outer tub, pushed into a rubber grommet so it touches the wash water. When it fails, the board sees a bad resistance and posts tE, refuses to heat, or lets the heater run on — which is why a broken one is worth replacing promptly.
Tools and Parts#
| Item | Purpose |
|---|---|
| Phillips #2 screwdriver | Panel access |
| Small pliers | Ease the grommet if needed |
| Multimeter | Confirm the thermistor failed |
| LG thermistor | Order by model number |
Do You Have the Right Tools?
Bearing puller set ($120), drum spider wrench ($85), multimeter ($85), and diagnostic software. Our technician arrives with $3,000+ in professional tools — your diagnostic is free.
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Before You Start#
Safety warning: Disconnect power. The sensor contacts water — ensure the machine is not mid-cycle with hot water when you access it.
Step-by-Step#
1. Locate the thermistor#
Reach it from the lower front behind the kick panel, through the door opening, or from the rear depending on model. On most LG front-loaders it is at the lower front of the outer tub, seated in a rubber grommet from outside, and it looks like a small cylinder about the size of a pencil eraser with a two-wire connector.
2. Test the old sensor#
Unplug the two-wire connector and read resistance across the terminals — roughly 10,000 to 15,000 ohms at room temperature for this NTC type, dropping as it warms. An open or near-zero reading confirms it has failed. If it reads in range, the fault is elsewhere and the sensor is fine.
3. Pull it out#
Ease the thermistor straight out of its grommet with steady pressure; do not twist or pry, and let the grommet stay in the tub wall. If the grommet comes out with the sensor, reseat the grommet before fitting the new one.
4. Fit the new sensor#
Push the new thermistor into the grommet until its flange meets the grommet face and it is fully seated. Reconnect the two-wire plug and make sure the leads are neither pinched nor stretched.
5. Test it#
Restore power and run an empty Hot wash. The machine should heat to the selected temperature with no tE code, and the door glass should feel noticeably warm within ten to fifteen minutes. If it never heats but shows no error, suspect the heater element instead; if it overheats or steams, cut power at once, since the sensor or board is not regulating.
6. Confirm with Smart Diagnosis#
Run LG's Smart Diagnosis to check the temperature readings look normal and that no stored codes remain from the old failure.
Safety First — Know the Risks
High-voltage components and pressurized water lines create flood and shock risk. A single loose fitting can cause thousands in water damage. Our techs are licensed and insured — let them handle the risk.
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Troubleshooting#
- tE returns with a new sensor: reseat the connector and inspect the harness to the board; some models use two sensors, so confirm you addressed the right one.
- Water never heats: test the heater element, which should read about 10 to 30 ohms and reads open when burned out.
- tE comes and goes: moisture in the connector shifts the resistance — a dab of dielectric grease keeps water out.
When to Call a Pro#
Call a technician if the board ignores the sensor signal entirely (a board fault), or if the water temperature stays erratic — overshooting or undershooting — even with a new sensor, which points at a board-side relay or triac.
The Real Cost of DIY
Average DIY attempt: $150-400 in tools you may use once, plus the risk of further damage. Our diagnostic visit costs $0 — we find the problem and give you an honest quote.
Licensed & Insured · 90-Day Warranty · Same-Day Service
Appliance Repair Technician & Diagnostics Specialist · 10 years experience
Electronics and diagnostics specialist with 10 years of experience in modern smart appliance repair, specializing in LG and Samsung.
