How to Replace an LG Washing Machine Temperature Sensor (Thermistor)

The temperature sensor (thermistor) on LG washing machines monitors water temperature during wash and rinse cycles. It is a small resistance-based sensor that changes its electrical resistance as temperature changes — the control board reads this resistance to determine current water temperature and control the heater element. When the thermistor fails, the washer displays a tE (temperature error) code, heats water continuously (dangerous), or does not heat at all.

On LG front-load washers, the thermistor is located in the outer tub at the bottom, typically inserted into a rubber grommet where it contacts the wash water directly. It is one of the simplest component replacements on an LG washer — a 15-minute job.

Before You Start

• Tools needed: Phillips #2 screwdriver (for panel access), small pliers
• Parts needed: LG thermistor/temperature sensor (model-specific, $10-25)
• Time required: 15-20 minutes
• Difficulty: Beginner
• 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 Instructions

Step 1: Locate the Temperature Sensor

The thermistor is accessible from the front (behind the lower front panel or through the door opening) or from the rear depending on model. On most LG front-loaders, it is at the lower-front area of the outer tub, inserted into a rubber grommet from outside. Some models mount it at the rear lower tub.

Remove the appropriate panel to locate it. It appears as a small cylinder (about the size of a pencil eraser) with a 2-wire connector, inserted into the tub wall.

Step 2: Test the Old Sensor

Before replacing, confirm failure with a multimeter. Disconnect the 2-wire connector. Measure resistance across the thermistor terminals:

• At room temperature (approximately 75F/24C): should read approximately 10,000-15,000 ohms
• Resistance decreases as temperature increases (NTC type thermistor)
• OL (infinity) or near-zero reading confirms failure

Step 3: Remove the Old Sensor

Gently pull the thermistor straight out of its rubber grommet in the tub wall. It slides out with moderate force. Do not twist or pry — the grommet should remain in the tub wall. If the grommet comes out with the sensor, reseat it before installing the new sensor.

Step 4: Install the New Sensor

Push the new thermistor into the grommet until it is fully seated (the flange on the sensor body should contact the grommet face). Reconnect the 2-wire connector. Verify the wires are not pinched or under tension.

Step 5: Test

Reconnect power and run a Hot wash cycle (empty). The machine should heat water to the selected temperature without displaying a tE error. You can verify proper heating by feeling the door glass during a hot cycle — it should become noticeably warm within 10-15 minutes.

If the machine never heats (water stays cold but no error), the heater element may be the issue rather than the sensor. If it overheats (steam, very hot glass), disconnect immediately — this indicates the sensor or control board is not regulating properly.

Step 6: Smart Diagnosis Verification

Run LG Smart Diagnosis to confirm the temperature readings are within normal range and that no stored error codes remain from the previous sensor failure.

Troubleshooting Common Issues

• tE error persists with new sensor: verify the connector is fully seated. Also check the wiring harness between sensor and control board for damage. On some models, check for a second temperature sensor (dual-sensor systems)
• Water does not heat: the issue may be the heater element rather than the sensor. Test the heater element resistance (should read 10-30 ohms — OL means burned out)
• Intermittent tE error: moisture in the connector causes resistance variation that confuses the control board. Apply dielectric grease to the connector to prevent moisture intrusion

When to Call a Professional

• If the control board is not responding to sensor signals (board failure)
• If water temperature regulation is erratic (overshooting, undershooting) despite new sensor — indicates board-side relay or triac failure

Cost Comparison: DIY vs Professional

Need Professional Help?

• washing machine repair service
• lg appliance repair
• washing machine repair cost guide

FAQ

Q: What does the tE error mean on an LG washer? A: tE stands for Temperature Error — the control board detected an abnormal resistance from the thermistor. This either means the sensor has failed (open or short circuit) or water temperature is outside expected range.

Q: Can I wash with cold water only if the sensor is broken? A: If the tE error allows the cycle to complete on cold-only settings, you can use the machine temporarily. However, if the error halts the cycle completely, replacement is needed before any further use.

Q: How does the thermistor affect energy efficiency? A: A properly functioning thermistor prevents the heater from running longer than necessary. A failed sensor that does not signal correct temperature can cause the heater to run continuously, wasting energy and potentially damaging clothing with excessive heat.

Q: Is the temperature sensor the same part on all LG washers? A: The sensor type (NTC thermistor) is the same, but the physical shape and connector may vary by model. Always order by your specific model number.

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