# How to Fix LG Error tE1 (Thermistor Failure)
The `tE1` error code on an LG washing machine (often seen on washer/dryer combo units) indicates a failure in the machine’s primary temperature sensing device, known as the thermistor.
Because the machine relies on this sensor to accurately manage heat and prevent overheating, it will automatically shut down the cycle when `tE1` is detected.
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## Explanation: What Does LG Error tE1 Mean?
**tE1** stands for **Temperature Error 1**.
This error signals that the main temperature sensor (thermistor) used to monitor the heat within the unit is reading values outside of the acceptable range, or it is completely open (failed).
While LG washing machines have thermistors to monitor water temperature, the `tE1` code often specifically points to a failure of the **Dryer Thermistor** located in the exhaust duct or heating assembly on combo units. The thermistor may be shorted, open, or reading the wrong resistance for the ambient temperature.
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## Step-by-Step Fix: Diagnosing and Replacing the Dryer Thermistor
**⚠️ Safety First:** Always unplug the machine from the electrical outlet before opening any panels or performing any inspections.
### Step 1: Power Reset and Visual Check
1. **Unplug the Unit:** Disconnect the machine from power for at least 5 minutes.
2. **Plug Back In:** Try running a short cycle (like Air Dry or a short Wash) to see if the error was a temporary glitch.
3. **Check Ventilation (If using a ventless combo):** If the unit has been running hot or failing during dry cycles, ensure the lint filter is perfectly clean and the condenser is not blocked.
If the error immediately returns, the thermistor likely needs replacement.
### Step 2: Locate the Thermistor
The Dryer Thermistor is typically located within the **heater assembly or exhaust duct** that handles the hot air. Accessing it usually requires removing the top and rear panels of the machine.
1. **Access the Rear:** Pull the machine out and unscrew the main rear access panel.
2. **Identify the Heater Housing:** Locate the metallic, tubular ductwork where the air is heated. The thermistor is usually a small, plastic or metallic sensor secured to this duct by a single screw or clip.
3. **Disconnect:** Carefully remove the wiring harness connected to the thermistor.
### Step 3: Test Thermistor Resistance (Using a Multimeter)
This step confirms whether the thermistor is faulty. You will need a multimeter set to measure resistance (Ohms – Ω).
1. **Set Multimeter:** Set the multimeter to the **20K Ohms (Ω)** setting.
2. **Test the Sensor:** Place the probes of the multimeter onto the two terminals of the thermistor itself (not the wiring harness).
3. **Read the Value:** At standard room temperature (around 70°F or 21°C), a functional LG thermistor should typically read between **5,000 and 15,000 Ohms (5KΩ to 15KΩ)**.
* **Failing Thermistor Sign 1 (Open):** If the meter reads **OL (Over Limit/Open Line)**, or shows infinite resistance, the thermistor is completely broken.
* **Failing Thermistor Sign 2 (Shorted):** If the meter reads **0.00 Ohms**, the thermistor is shorted out.
* **Conclusion:** If the reading is far outside the typical range, or is zero/OL, the component has failed and must be replaced.
### Step 4: Check Wiring and Connections
If the thermistor tested fine in Step 3, the problem might be electrical:
1. **Inspect the Harness:** Look closely at the wiring leading from the thermistor back to the main control board (PCB). Check for burnt spots, cuts, or corrosion on the connectors.
2. **Check for Water Damage:** Water leakage near the lower PCB can cause inaccurate readings. If you see signs of water damage, the control board may also need repair or replacement.
### Step 5: Replace the Thermistor
If testing confirms the thermistor is bad:
1. **Remove Old Part:** Unscrew or unclip the faulty thermistor from the duct housing.
2. **Install New Part:** Secure the new Dryer Thermistor in the exact location the old one was removed from.
3. **Connect Wiring:** Reattach the wiring harness securely.
4. **Reassemble:** Reinstall the rear panel, plug the machine in, and test a dry cycle. The `tE1` error should now be resolved.
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Check the price for a replacement Dryer Thermistor here: https://www.amazon.com/s?k=LG+Dryer+Thermistor&tag=trivian-20
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