Why Is My LG Washing Machine Not Heating the Water?
Run a short 60°C cotton cycle and check whether the drum feels warm to the touch after 10 minutes — if it does not, unplug the machine, locate the heating element behind the drum, and use a multimeter to test it for continuity; a failed element is the cause in the majority of cases and replacing it typically resolves the fault (takes about 30 minutes).
Fault description
When an LG washing machine stops heating water, clothes come out of the drum smelling stale, detergent residue is left on fabrics, and greasy stains are not properly removed. The machine will usually complete its cycle without interruption, giving no obvious sign that anything is wrong — until you notice the results. In some cases, the control panel will display an error code such as tE, tE1, tE2, or tE3, which all point to a fault in the temperature sensing or heating circuit.
The heating system in an LG washing machine involves three main components working together: the heating element itself, the NTC thermistor (temperature sensor), and the main control board that interprets sensor readings and switches the element on and off. A failure in any one of these parts — or in the wiring that connects them — can prevent the water from reaching the correct temperature. Because this fault sits in the electrical system, it is rated as an advanced repair.
Causes
- Failed heating element — The heating element is a resistive coil submerged in the drum sump that directly heats the water. Over time it burns out or develops a break in the coil, causing it to draw no current and produce no heat.
- Faulty NTC thermistor (temperature sensor) — The NTC thermistor monitors water temperature and sends a resistance reading to the control board. If it drifts out of calibration or fails completely, the board either never activates the element or shuts it off too early, triggering tE-series error codes.
- Defective main control board — The control board contains the relay that switches power to the heating element. A burnt relay contact or failed component on the board means the element never receives power, even if the element and thermistor are both in good condition.
- Damaged or corroded wiring harness — The wires connecting the heating element and thermistor to the control board can corrode, chafe against the drum, or work loose at their connectors. An intermittent or open-circuit connection produces the same symptoms as a component failure.
- Limescale build-up on the heating element — In hard-water areas, calcium deposits coat the element and act as an insulating layer, dramatically reducing heating efficiency. The element may still be electrically intact but unable to transfer heat effectively to the water.
- Tripped thermal cut-out — LG machines include a thermal cut-out fuse as a safety device that permanently opens the circuit if the element overheats. Once tripped it cannot reset itself and must be replaced before heating will work again.
Step-by-Step Fix
- 1
Confirm the fault and check for error codes
Select a 60°C or 90°C cotton programme and start the machine. After 10–15 minutes, carefully feel the door glass — it should be noticeably warm. If it remains cold, note any error code on the display (tE, tE1, tE2, or tE3 all indicate a heating or temperature-sensing fault). Write down the code before proceeding.
- 2
Disconnect power and access the heating element
Unplug the machine from the mains and turn off the water supply. On most LG front-loaders the heating element is accessed from the rear panel. Remove the screws securing the back panel, locate the element at the bottom of the drum, and photograph the wiring before disconnecting anything.
- 3
Test the heating element with a multimeter
Disconnect the two spade connectors from the element terminals. Set your multimeter to the resistance (Ω) setting and probe both terminals. A healthy LG element typically reads between 20 and 50 ohms. A reading of zero (short circuit) or infinite resistance (open circuit) confirms the element has failed and needs replacing.
- 4
Test the NTC thermistor
The thermistor is usually clipped into the centre of the heating element or mounted nearby. Disconnect its two-pin connector and measure resistance across its terminals at room temperature — most LG NTC sensors read approximately 10,000–15,000 ohms at 20°C. A reading far outside this range, or an open circuit, means the thermistor is faulty.
- 5
Inspect the wiring harness and connectors
With the rear panel still off, trace the wiring from the element and thermistor back towards the control board. Look for melted insulation, corrosion on connector pins, or terminals that pull free with light pressure. Reseat any loose connectors firmly and repair or replace any damaged sections of wire before reassembling.
- 6
Check for limescale and clean the element
If the element tests electrically sound but heating is poor, heavy limescale may be the cause. You can carefully descale the element in situ using a proprietary washing machine descaler run on a hot empty cycle, or remove the element and soak it in a diluted citric acid solution for several hours before refitting.
- 7
Replace the faulty component and test
Fit the replacement element, thermistor, or thermal cut-out using the correct LG spare part for your model number. Reconnect all wiring, refit the rear panel, and run a 60°C test cycle. Confirm the door glass becomes warm within 15 minutes and that no tE error code reappears.
When to call a service technician
If you have replaced both the heating element and the NTC thermistor and the machine still fails to heat — or continues to display a tE-series error code — the fault most likely lies with the main control board. Diagnosing and replacing a control board requires reading circuit diagrams, identifying failed components, and handling mains-voltage connections, which goes beyond a straightforward DIY repair.
You should also contact a service technician if you find burnt or melted wiring near the element, if the machine trips your household circuit breaker when it attempts to heat, or if you are not confident working safely with the electrical components inside the appliance. These signs can indicate a more serious underlying fault that needs professional assessment.
Prevention
The parts most commonly replaced when an LG washing machine stops heating are the heating element, the NTC thermistor, and the thermal cut-out fuse. Using genuine LG-specification parts ensures the correct resistance and temperature ratings for your model. If you live in a hard-water area, running a monthly descale cycle with a washing machine cleaner will significantly extend the life of the heating element by preventing the calcium build-up that causes premature failure.
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Frequently Asked Questions
What do the tE, tE1, tE2, and tE3 error codes mean on an LG washing machine?
All four codes relate to the heating and temperature-sensing circuit. tE and tE1 typically indicate that the control board is not receiving a valid signal from the NTC thermistor, while tE2 and tE3 can point to the thermistor reading an out-of-range temperature or a fault in the heating element circuit itself. In practice, all four codes warrant testing both the thermistor and the element.
Can I still use my LG washing machine if it is not heating the water?
The machine will usually complete cycles normally, so it is not dangerous to use in the short term. However, cold-water washing will not effectively remove grease, kill bacteria, or dissolve detergent properly, so hygiene and cleaning performance will be significantly reduced. It is best to diagnose and fix the fault as soon as possible.
How do I know if it is the element or the thermistor that has failed?
A multimeter is the most reliable way to tell them apart. Test the element first — a reading outside the 20–50 ohm range confirms it has failed. If the element is fine, test the thermistor; a reading far from 10,000–15,000 ohms at room temperature points to a faulty sensor. Replacing the correct component avoids unnecessary expense.
Is a heating element replacement something a homeowner can do, or does it need a professional?
Replacing the heating element on most LG front-load washing machines is a manageable DIY task if you are comfortable working with basic hand tools and a multimeter. The key requirements are disconnecting power before starting, photographing wiring before removal, and sourcing the correct part for your model number. If you are unsure at any stage, calling a service technician is the safer choice.
Why does my LG washing machine heat on some cycles but not others?
Some LG programmes — including many quick-wash and delicate cycles — are designed to run at low temperatures or cold water only, so the element not activating on those cycles is normal. If heating is inconsistent on programmes that should be hot, a failing thermistor or an intermittent wiring connection is the most likely cause, as these can produce erratic behaviour rather than a complete failure.