HE error in LG dishwasher: causes, symptoms, and solution

The HE error on an LG dishwasher indicates a problem in the circuit that heats the water or in the temperature reading taken by the appliance itself. In practice, the unit may fail to reach the expected temperature or believe it has exceeded it, and for safety it stops the cycle before it keeps damaging itself.

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What the HE warning really means

On LG dishwashers, HE does not point to a minor fault or a simple maintenance alert. The message is related to temperature: either the water is not heating as it should, or the system detects an abnormal reading that falls outside the expected range. LG considers that deviation critical and blocks the program to prevent uncontrolled operation.

The figure that appears in the most common technical documentation helps explain the alert: the sensor can trigger it when it detects a temperature higher than 194 degrees Fahrenheit, about 90 degrees Celsius. That does not necessarily mean the water is actually at that temperature in every case; sometimes the fault is in the sensor, not in the actual heat. That nuance is key because it completely changes the diagnosis and, with it, the repair.

When the heating system fails, the result is usually noticed in the dishes before it is seen on the screen. Plates come out greasy, glasses lose their shine, and drying is left halfway done. If the electronic board keeps the heater active longer than it should, the problem goes in the opposite direction: excess heat, plenty of steam, and a safety shutdown that can no longer be ignored.

The parts usually behind the fault

The first suspect is the heating element or heater element. If it is open, burnt out, or has a damaged connection, the dishwasher stops raising the water temperature normally. The cycle may continue moving, but the wash loses effectiveness and the drying is far from what is expected. In this scenario, the user usually notices cold or barely warm water at the end of the program.

The second component is the thermistor, the sensor that informs the control board about the internal temperature. If that probe ages, disconnects, or sends an incorrect reading, the dishwasher may think the water is too hot even when it is not. The code then appears as a defensive response, almost like a door closing because of a technical suspicion rather than a visual certainty.

The third path involves the electronic board. In some cases, the relay that controls the heater gets stuck and the element remains active longer than it should. The water rises in temperature, the system interprets that it has crossed an unsafe threshold, and the program cuts out. It is a less visible fault from the outside, but also one of the most delicate, because it combines control, power, and safety in a single part.

How to tell a broken heater from a misleading sensor

The most useful way to guide the diagnosis is to observe the actual temperature inside the tub. If the dishwasher stops with cold water, the problem is closer to the heater or the electrical supply that activates it. If, on the other hand, when you open the door you notice a very hot tub, excessive steam, or an interior that is almost boiling, suspicion shifts toward the sensor or the control board.

The moment when the warning appears also matters. When the error appears at the start of the cycle, the electronics are already receiving a strange signal from the first minute. If it appears at the end, during drying or after an intense wash phase, the clue usually points to the thermal system working outside its normal range. Time, in these cases, says more than it seems.

The appliance’s condition also matters. A dishwasher with heavy limescale, years of use, or worn connectors has more chances of suffering erratic readings. Moisture, steam, and sudden temperature changes punish both the sensor and the wiring. Sometimes the problem is not in the part first suspected, but in a loose terminal or damaged connection acting as a faulty intermediary.

What to check before thinking about a complex repair

The first useful step is to unplug the unit for 60 seconds and turn it back on. That full shutdown clears the electronics and removes momentary errors that can remain stored in memory. It does not fix a broken heating element or a damaged board, but it does eliminate occasional faults that are sometimes mistaken for an established breakdown.

Next, it is worth looking at the overall behavior of the cycle. If the program starts normally but the water still does not heat up, the fault is concentrated in the thermal section. If the unit stops after it has been running for a while and too much heat is noticeable, attention should turn to the electronic control. You do not need to take anything apart to get these clues; just observe the noise, steam, and the exact moment of the shutdown.

The sensible thing is to stop any DIY repair attempt once a multimeter, continuity measurement, or probe check comes into play. At that point we are no longer talking about a simple action, but about an intervention that requires technical judgment. Handling the heating area without experience can worsen the damage, cause a short circuit, or leave the appliance out of warranty if it still has one.

Why you should not keep using the appliance with this warning

A dishwasher that loses control of temperature is not operating under normal conditions. If it does not heat, detergent performs worse, grease sticks more easily, and the dishes come out dull. If it heats too much, thermal stress affects seals, hoses, connectors, and the electronics themselves. In both cases, continuing to use it speeds up wear.

Safety is also part of the equation. The unit is designed to cut the cycle when it detects a dangerous deviation, and that shutdown is not a software whim. Excess heat or a complete lack of heating can trigger greater damage over successive cycles, from warped parts to more serious electrical failures. The HE warning therefore acts as a clear boundary between normal use and a fault that already needs attention.

In addition, the problem is noticeable beyond the screen. Drying drops sharply, glasses are left with residue, and the inside of the appliance can develop odors due to a combination of moisture and incomplete cleaning. What starts as a thermal anomaly ends up affecting the household routine, because a dishwasher that does not regulate temperature properly stops performing its main function accurately.

What service technicians usually check

Professional diagnosis usually starts by checking the heating element, the thermistor, and the control board. That sequence separates the most common cases quite well: if the heating element is open, it is replaced; if the sensor is reporting incorrectly, the probe is replaced; if the board relay gets stuck or sends erratic commands, the electronics are repaired. Each cause points to a different solution, which is why the same code is not always resolved in the same way.

The terminals and wiring near the heating assembly are also inspected. Constant heat and moisture are a tough combination for connectors, which can corrode, loosen, or show signs of overheating. In those cases, the main component may be fine, but the power reaching it is not. Serious diagnosis looks at the whole system, not just the part that appears first on the list of suspects.

On heavily used models, the service technician usually looks for signs of overheating on the board and checks whether the heater relay responds consistently. That part cannot be solved by eye. It requires measurement, experience, and an orderly reading of the symptom. That is why the HE warning provides guidance, but does not give the verdict: it marks the territory of the fault, not the exact name of the culprit.

The safety logic behind LG dishwashers

LG dishwashers combine sensors and electronic control with considerable precision. That architecture offers clear advantages: it detects deviations quickly and prevents the appliance from continuing to operate under abnormal conditions. But it also means that an out-of-range reading has an immediate, almost abrupt effect, like a door closing before the problem gets worse.

That sensitivity explains why some warnings seem more blunt than the user expects. The system does not try to make an approximate assessment; it cuts out when it sees an anomaly that affects the core of operation. In an appliance that depends on heat to wash and dry, that control is part of the design, not a design flaw.

That is why the HE message should be read as a precise warning. It does not talk about dirt, a minor blockage, or a wrongly selected program. It talks about temperature out of range, a component that stops working as it should, or electronics that control heating incorrectly. That is the line separating a simple nuisance from a technical review that no longer allows much delay.

A sign that calls for diagnosis rather than trial and error

The HE error on an LG dishwasher usually fits into a fairly defined map: heating element, thermistor, or board. From there, the key is not to guess, but to interpret the symptom calmly. Cold water, excessive steam, or premature shutdown do not mean the same thing, even though they all lead to the same code. The appliance speaks in a brief language, but it leaves enough traces to know where to look.

At home, the reasonable margin is small: power reset, cycle observation, and little else. If the unit keeps showing the warning, it is prudent to assume the anomaly is no longer temporary. In a system that heats water to high temperatures, the difference between a misleading reading and a real fault may seem slight, but it decides whether the problem stays a scare or becomes a serious repair.

The value of the warning lies precisely there. HE does not describe the whole story, but it does mark the exact point where normal operation breaks down. And in a modern dishwasher, when thermal control fails, the rest of the cycle falls out of order like a row of tiles collapsing after the first push. Detecting it in time prevents the fault from gaining ground and the machine from going from a silent helper to a closed box that only returns errors.