Encountering an LG washing machine HE error can be a frustrating interruption to your laundry routine, leaving you with cold water and an unfinished cycle. This specific error code stands for “Heating Error,” indicating that the appliance’s system has detected a malfunction within the water heating circuit. While modern LG washers are designed to be durable, components related to temperature regulation can eventually wear out or fail, triggering this alert.
This guide serves as a professional troubleshooting guide to help you diagnose and potentially resolve the issue. We will explore the technical causes, including the heating element, thermistor, and control board, and provide step-by-step instructions on how to test them safely.
Understanding the LG Washing Machine HE Error
The HE error code is essentially a safety mechanism. When you select a wash cycle that requires hot or warm water, the main PCB (Printed Circuit Board) sends a signal to the water heater to activate. Simultaneously, the temperature sensor, known as a thermistor, monitors the rising water temperature.
If the control board detects that the water temperature is not increasing significantly within a set timeframe, or if it receives erratic signals from the sensors, it halts the cycle and displays the LG washing machine HE error. This prevents potential overheating or electrical hazards.
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Front-Load Washer vs. Top-Load Washer
While the error code is universal across LG models, the physical location of components may differ.
- Front-load washer: The heater assembly is typically located at the bottom front of the outer tub, accessible by removing the front panel.
- Top-load washer: The heating components are often situated at the bottom of the tub, which may require accessing the machine from underneath or removing the back panel depending on the specific model.
Primary Causes of the HE Error
Before disassembling your machine, it is helpful to understand which components are likely at fault. The error is rarely a software glitch; it usually points to a hard failure in one of the following entities:
- Faulty Heating Element: This is the most common culprit. Over time, the resistive coil inside the element can break (open circuit) or short out, preventing it from heating the water.
- Defective Thermistor: If the thermistor fails, it cannot accurately report the temperature to the computer. It might tell the board the water is boiling when it is cold, or vice versa.
- Damaged Wiring Harness: The vibration of the machine can sometimes cause wires to chafe or connectors to come loose. A break in the wiring harness between the heater and the board will result in an immediate error.
- Malfunctioning Control Board: In rare cases, the control board itself may have a blown relay or damaged circuit that fails to send power to the heater.
Step-by-Step Troubleshooting Guide
Safety Warning: Always unplug the washing machine from the power outlet and turn off the water supply before attempting any repairs. You will be working with high-voltage components, so safety is paramount.
Tools Required
- Multimeter (Essential for testing electrical values)
- Screwdriver set (Phillips and Flathead)
- Socket wrench (usually 10mm)
- Needle-nose pliers
Step 1: Physical Inspection and Wiring Check
Start by accessing the heater assembly. For most front-load units, this involves removing the top panel, the control panel, and finally the front cabinet panel.
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- Locate the heating assembly at the bottom of the tub. You will see a metal flange with electrical terminals.
- Inspect the wiring harness. Look for any signs of burning, corrosion, or loose connections.
- Ensure the plastic connectors are firmly seated on the heating element and the temperature sensor.
Step 2: Testing the Thermistor
The thermistor is usually a small probe located right next to the heating element. It varies its resistance based on the temperature.
- Set your multimeter to the Ohms (Ω) or Resistance setting.
- Disconnect the wire connector from the thermistor.
- Place the multimeter probes on the two terminals of the thermistor.
- Analyze the Reading:
- At standard room temperature (approximately 77°F or 25°C), a healthy LG thermistor should typically read around 39.5 kΩ (39,500 Ohms).
- If you get a reading of “OL” (Open Loop) or infinite resistance, the sensor is broken internally.
- If the reading is near 0 Ω, the sensor is shorted.
- Note: Consult your specific model’s service manual for exact values, as some vary between 12kΩ and 50kΩ.
Step 3: Testing the Heating Element
If the thermistor checks out, the next suspect is the water heater element itself.
- Keep your multimeter on the Resistance (Ω) setting.
- Remove the wires attached to the heating element terminals.
- Resistance Test: Touch the probes to the two main power terminals of the element.
- You should see a reading between 10 and 30 Ohms. (Commonly 12-18 Ω or ~25 Ω depending on wattage).
- If the meter reads “OL” (infinity), the element is burnt out and must be replaced.
- Continuity Test to Ground:
- Set the multimeter to the continuity test mode (often indicated by a sound wave symbol).
- Place one probe on a heater terminal and the other probe on the metal casing of the heater or the ground tag.
- The meter should not beep. If it beeps or shows resistance, the element has a “ground fault” (leakage) and is dangerous. It must be replaced immediately.
Replacing the Heating Assembly
If you have confirmed a fault in either the heater or the sensor, they are often sold as a combined assembly or can be replaced individually.
- Loosen the 10mm nut in the center of the heater flange. Do not remove it completely; just loosen it until it is flush with the bolt end.
- Push the bolt inward. This releases the pressure on the rubber gasket seal inside the tub.
- Gently wiggle and pull the heater assembly out. It may be stiff due to limescale buildup.
- Insert the new heating element, ensuring it slides into the bracket holder inside the tub (essential to prevent it from hitting the drum).
- Tighten the center nut to expand the seal and reconnect the wiring harness.
Advanced Diagnosis: The Control Board
If both the heating element and thermistor test within the correct specifications, the issue likely lies with the Main PCB.
- Trace the wires from the heater back to the main control board.
- Check for continuity along the entire length of the wire to ensure no breaks exist hidden inside the insulation.
- Inspect the control board visually for any “puffed” capacitors or burn marks near the heater relay.
- If the board is not sending 120V (or 240V in some regions) to the heater during the wash cycle, the board will need to be repaired or replaced by a professional.
Preventive Maintenance Tips
To avoid seeing the LG washing machine HE error in the future, consider these maintenance tips:
- Descaling: If you live in a hard water area, limescale can coat the heating element, causing it to overheat and fail prematurely. Run a monthly tub clean cycle with a descaling agent.
- Use HE Detergent: Excessive suds from non-HE detergent can trick the water level sensor, sometimes leading to heater activation when the water level is too low (dry firing).
- Check Inlet Filters: Ensure your water inlet filters are clean. Restricted water flow can cause temperature fluctuations that confuse the logic of the Main PCB.
Conclusion
The LG washing machine HE error is a clear indicator of a failure in the temperature regulation system. By systematically checking the heating element, thermistor, and wiring connections using a multimeter, you can isolate the problem accurately. Whether the solution involves a simple sensor replacement or installing a new water heater assembly, addressing this error promptly ensures your front-load washer continues to operate safely and efficiently. If you are uncomfortable performing a continuity test or handling electrical components, always consult a certified technician to avoid causing further damage to the appliance.
Frequently Asked Questions
What does the HE error code mean on an LG washing machine?
The HE code stands for “Heating Error.” It indicates that the washer’s control board has detected a malfunction in the water heating circuit. This happens when the water fails to reach the proper temperature within a set time or if the sensors provide erratic temperature readings.
Can I still use my washer if it displays the HE error?
In most cases, the washing machine will halt the cycle immediately once the error is detected as a safety precaution. This prevents potential electrical hazards or overheating. You will need to resolve the issue and reset the machine before it can complete a wash cycle.
How do I know if the heating element or the thermistor is the problem?
The best way to differentiate between the two is by using a multimeter to test their resistance. At room temperature, a healthy thermistor should read approximately 39.5 kΩ, while a functional heating element should show a resistance between 10 and 30 Ohms. If either component shows “OL” (Open Loop), it is burnt out and needs replacement.
Can hard water cause the HE error code?
Yes, hard water can lead to a significant buildup of limescale on the heating element. This scale acts as an insulator, forcing the element to work harder and eventually causing it to overheat and fail. Regular descaling of your machine can help prevent this issue.
Is it safe to repair the HE error myself?
If you have experience with basic tools and a multimeter, you can diagnose the issue yourself. However, because this repair involves high-voltage electrical components and water seals, you must always unplug the machine before starting. If you are uncomfortable with electrical testing, it is best to contact a certified technician.
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