LG dishwashers are known for their top performance and their efficiency; however, they can experience errors and bugs from time to time, like all other electronic appliances. While this can be frustrating and lead to a display of an error code, these codes alert you that there’s an issue with your dishwasher.
Once you understand what the code refers to, which you can do through the user manual, solving the problem won’t be too challenging.
So, there’s no need to worry because this article will examine what the LG dishwasher HE error code means. In addition, this guide will help walk you through troubleshooting this error code and how to solve and prevent each cause.
Causes of LG Dishwasher HE Error Code
The LG dishwasher HE error code stands for Heater Error, meaning there is an issue with the dishwasher’s heating element. The HE can result from 2 conditions; the first is that there is no heat in your dishwasher; no heat means that the dishwasher can’t heat the water to clean the dishes.
The second condition is overheating; the HE is also triggered when the heat goes beyond the limits of the appliance. The limit of the LG dishwasher is above 149 degrees Fahrenheit, so when the dishwasher senses that the temperature is above this limit, it displays the HE error code to alert you.
In the points listed below, I will guide you on how to determine the cause of the no heat or the overheating problem in the first place.
1. Dishwasher Electronic Glitch
The LG dishwasher is like any other electronic device; it can experience bugs and electronic glitches no matter what model you are using, and these glitches can often cause some errors to be displayed, like the HE error code. Therefore, the first step when troubleshooting your dishwasher is to assume that the cause of the error is an electronic glitch.
The reason is that a simple reset of the dishwasher can fix the glitch. As a result, this will help you save a lot of time and effort.
2. Defective Thermistor
The thermistor (temperature sensor) is an essential component of your dishwasher because it measures the water temperature inside the dishwasher. Then, the data collected by the thermistor is sent to the main control board, and depending on it, the dishwasher functions accordingly.
For example, if the thermistor senses the water is cold, it will signal the control board to increase power. The power will help the dishwasher heat the water until the thermistor senses that the water reached the appropriate temperature so the dishwasher doesn’t overheat.
When the thermistor (temperature sensor) is defective, it will collect the wrong data (water temperature) and send it to the main control board. As a result, the dishwasher will end up not heating, overheating, or any other thermal errors.
3. Malfunctioning Heater
The heater, or the heating element, is an essential part of the dishwasher; it can be found at the base. The heating element is a big resistor because its materials have high electrical resistance.
The heating element is responsible for the heat the dishwasher produces; when the appliance is connected to power, the heater converts the electricity to heat using its heat-resistance materials.
Therefore, if the heating element is suffering from any issue, it will affect the dishwasher’s performance because it won’t heat at all or overheat. The heater can malfunction because of either short circuits or physical damage.
For example, if the heater is damaged, it can either heat up partially or not at all, causing the LG dishwasher error due to no heat condition. Meanwhile, if the heater is shorted, it can overheat, triggering the HE code due to the overheating condition.
4. Faulty Main Control Board
The main control board or the main printed circuit board (PCB) is the part that controls everything in the dishwasher; the board contains the components of the dishwasher that send and receive the signals so that the dishwasher can function correctly.
Therefore, if there is any fault or defect in the main control board, it can affect everything. As a result, the dishwasher control board can trigger the heating error even if the parts responsible for the heating process, like the heater or the thermistor, are intact.
5. Improper Electrical Wiring
The electrical wiring is responsible for transmitting the signals between the board and the components of the dishwasher. Therefore, faulty electrical wiring of the appliance may affect the performance of some parts, like the heater or the thermistor.
As a result, the HE error can be triggered; the wiring can also be damaged in some areas of the dishwasher. For example, the insulation of the LG dishwasher can get sticky over time due to heating which can get the wires damaged if they get stuck in it.
6. Defective Pressure Switch (Pressostat)
The pressure switch is responsible for the flow of water (water level) into the heating element. Insufficient water flow can cause the pressure switch to send a signal to turn off the heating element, resulting in the dishwasher not heating the water and triggering the HE issue.
If the pressostat is faulty, it will shut off the heating element even if the water flow is sufficient, which will cause the LG dishwasher HE error code. Therefore, checking the pressure switch after checking the heater and the thermistor is essential.
How To Fix LG Dishwasher HE Error Code
Now that we’ve discussed all the possible causes of the LG dishwasher HE error code, let’s examine how to solve each reason in detail.
1. Resetting the Dishwasher
The first step to reset the dishwasher is to turn off the power; you can do so by either shutting off the dishwasher’s circuit breaker or unplugging the dishwasher’s plug.
Then, let the dishwasher sit without any power for 1-2 minutes, allowing any power inside the dishwasher to be discharged. As a result, the appliance will be reset, next, reconnect the plug of the dishwasher or turn on the circuit breaker.
If the dishwasher was facing an electronic glitch, it should now disappear; if the issue persists, then it’s not an electronic glitch, and you should follow the troubleshooting steps mentioned above.
2. Replacing a Defective Thermistor
The solution to a defective thermistor (sensor) is replacing it; unfortunately, you can’t fix or repair the thermistor. You don’t have to worry, though; it’s an easy process; simply follow the steps provided below:
- Power off the dishwasher using the power button and unplug or turn off the circuit breaker.
- Turn off the inlet water supply valve of the dishwasher.
- Disconnect the drain hose.
- Remove the dishwasher from its cabinet.
- Turn the dishwasher upside down.
- Remove the lower access panel of the dishwasher.
- Disconnect the electrical connection from the junction box. (wire harness)
- Locate the faulty thermistor.
- Disconnect the thermistor.
- Install the new thermistor.
- Reconnect the electrical connection. (wire harness)
- Install the lower access panel.
- Return the dishwasher to its place.
- Connect the dishwasher drain hose and turn on the inlet valve.
- Plug your dishwasher and power it on using the power button.
3. Replacing a Malfunctioning Heater
Unfortunately, the heating element is similar to the thermistor; it can’t be recovered or repaired; therefore, if the heater is faulty, you must replace it. Replacing a heater is a straightforward process, so you don’t need to worry or hire a technician.
First, you will need to locate the heater, which is at the base of the dishwasher, then disconnect the heater from both sides. Install the new heater and turn on your dishwasher to test it.
4. Fixing a Faulty Main Control Board
If an individual component on the board is causing the HE error, you will need to replace it; however, without proper knowledge, it’s hard to locate that component. Therefore, it’s recommended that if the problem is with the main control board, then replace it with a new one.
Purchasing a new control board can be expensive, but it’s the best way to ensure the error doesn’t appear again in the future.
5. Fixing Improper Electrical Wiring
While inspecting electrical wiring, in general, may seem like a hassle, it’s not that complex. First, you will need to access the wiring connections of the dishwasher and inspect every connection to ensure no wires are loose or frayed.
Any damaged wires must be replaced to ensure they don’t affect other parts. Inspect the insulation part of the dishwasher and ensure it’s intact and no wires are trapped in it.
However, if the insulation is sticky or soft, you must replace it to avoid wires getting stuck and breaking. While it may not be a complex process, if you are uncertain of your knowledge or skills, consulting a trained technician is recommended.
6. Replacing a Defective Pressure Switch (Pressostat)
The pressure switch is one of the parts inside the dishwasher that can’t be repaired or fixed, like the heating element or the thermistor. Therefore, if the pressure switch is faulty, you will need to replace it.
This is a straightforward process, though; simply locate the pressure switch inside the dishwasher and replace it with a new one. It’s crucial that you cut off the power supply of the dishwasher before you start the replacement process.
Preventing LG Dishwasher HE Error Code
While it’s normal for any appliance to face issues over time, there are some steps you can take to ensure that you prevent certain problems like the HE error code in the future. The most critical one, obviously, is regular maintenance.
1. Regular Maintenance
All electronic appliances require regular maintenance from time to time to keep their top performance and efficiency. Therefore, to avoid any issue like the HE in the future, you will need to maintain your LG dishwasher regularly.
The maintenance should include checking the dishwasher’s wiring and ensuring no loose or damaged wires. Improper wiring can affect other parts inside the dishwasher, resulting in several problems over time.
Inspect every part inside your dishwasher to ensure no component suffers from damage or short circuit. Noticing the problem before it aggravates will help you solve the problem without going through the frustration of facing an error while using the dishwasher.
FAQs
What is the Limit of the LG Dishwasher Heating Element?
The temperature limit of the LG dishwasher heating element is 149 degrees Fahrenheit. If the temperature inside the dishwasher exceeds this limit, the HE error code will be displayed to alert you that the dishwasher is overheating.
Which Part of the Dishwasher Heats the Water?
The heater or heating element is the part inside the dishwasher responsible for heating the cold water. The heating element can be found at the base of the dishwasher, and it’s connected from both sides.
Is Hot Water Necessary for the Dishwasher?
No, the hot water is not necessary for the dishwasher to operate; however, the hot water helps the dishwasher to clean the dishes and items. In addition, the hot water ensures the dishwasher gets rid of any germs or microbes.
Do Dishwashers Heat the Water or Use Hot Water?
When installed, the dishwasher is connected to a hot water supply; however, if the hot water supply is unavailable, the dishwasher has a heating element that heats the water to the required temperature.
Therefore, it’s fine if you don’t have a hot water supply and only have a cold water supply. The dishwasher still will operate and heat the water by itself.
Why is there a Burning Smell from My Dishwasher?
A burning smell coming from your dishwasher may indicate that it has overheated; the overheating can happen due to many possible reasons. Therefore, you will need to power off the dishwasher and inspect the reason behind the overheating issue.
Adrian is an ISCET licensed professional that has completed the National Appliance Service Technician Certification Exam and has the expertise to diagnose and repair any appliance. He is well-versed in the latest technologies and techniques and is always up-to-date on the latest industry standards.
