5 Common LG Microwave Error Codes (+Quick Fix)

Microwaves are high-duty electric appliances, and it is common to encounter faults in them in the long run. LG microwave displays error codes communicating the specific faults to make it easy to figure them out. If you want to know the common LG error code and the steps to fix it, you are at the right place.

Error code-02 in the LG microwave indicates temperature issues; you can fix them by replacing the PCB. If a short circuit occurs in the microwave, it shows an F-3 error code. Wiring issues and faulty temperature sensors may cause it. To fix it, find the cause and replace the faulty parts.

Error Codes	Description
E-02	Temperature issues.
F-3	Short circuit
E-10	The touchpad is not responding
E-03	Cooling issues in the microwave
E-05	Temperature going above-set limit

Common LG microwave error codes

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In this article, I will help you understand 5 common LG microwave error codes and steps to fix the errors. So, keep reading.

Table of Contents

What are the common LG microwave error codes? (+Quick fix)

Error codes in the LG microwave occur when certain faults in it.

Here are 5 common LG error codes and steps to fix those error codes:

1. Error code E-02

E-02 error code in the LG microwave indicated the convection mode where the temperature doesn’t rise more than 100℃, affecting the cooking quality.

A faulty convection relay may trigger the E-02 error code in the LG microwave.

To fix this issue, you must replace the PCB.

Follow the steps below to replace the PCB:

Before beginning the repair, purchase the new PCB based on the model of your LG microwave.

Ensure you get the branded PCB because poor quality PCB will fail soon and may cause inconvenience soon.

You can locate the information regarding the model number of your microwave in the user manual.

Or at the side of the microwave where details are listed on the stickers.

Unplug the microwave from the electric outlet to prevent yourself from electric elocution.

As microwaves are high-voltage electric appliances, they bear high-voltage capacitors which hold electric charges even after unplugging them from the electric outlet. So, you must let it undisturbed for 10 to 20 minutes after the power is shut off. This way, a capacitor will lose all the electric charges before you come in contact with it.
Open the microwave and remove all the removable parts, like the grill stand and vent. The grill is secured in the microwave with the clips; twist them carefully to remove the grill from the microwave.
Access the bottom panel of the microwave and remove the screws attached to disconnect it from the microwave.

Lift and pull the microwave to move it from the cabinet and place it on a solid surface to work comfortably.
Access the front panel of the LG microwave. Using a screwdriver, remove the screws securing the front panel. Pull the front panel forward.
Remove the microwave’s control panel by disconnecting the screws securing it.

In addition to screws, control panels are secured with clips all around the corner. Run the slotted screwdriver around the panel to release it from the retaining clips.
Pull out the control panel, and you can see wires attached to the control panel.
Take a digital photo of the wires for future reference, so you will understand which wires to connect.

Disconnect the wires from the control panel by removing them from the slots.
You must disconnect the ground wire to disconnect the front control panel completely.
As a next step, you must remove the main control board. The main control board will resemble a computer chip.

Remove the screws holding the control board in place. And disconnect the control board from the panel.
You can see wires connected to the control panel. Disconnect the wire harness to remove the control board completely.
Replace the new control board, secure it with screws, and connect the wires you disconnected.

Reconnect the control panel and secure it with the screws you removed.
Reattach the front panel and bottom pane, and secure them with the screws you removed.
Move the microwave to the cabinet and secure it with the bolts.

Plug in the microwave and check if the error code, E-02, has disappeared.

If the error code is still showing, seek help from a professional to figure out what went wrong.

2. Error code F-3

The error code F-3 occurs in your LG microwave when a short circuit occurs. A short circuit, if left unoperated, will cause a fire in the kitchen.

Common causes of the F-3 error code are:

Faulty temperature sensor
Wiring issues

Electronic oven control (EOC) issues

Follow the steps below to fix the issue:

As the steps involve dismantling the microwave, do it only if you are confident and well-experienced in working with the electrical appliance.

Replace the temperature sensor

The temperature sensor detects the temperature inside the microwave oven, passes the information regarding the control panel, and forces the control panel to switch off if the temperature increases.

If the temperature sensor is faulty, it will not detect the temperature, and the microwave oven will continue to run at a high temperature resulting in fire hazards.

In such a case, you must replace the temperature sensor.

Follow the steps below to replace the temperature sensor in the LG microwave:

Unplug the LG microwave from the electric outlet.
Remove the grill and racks using a Philip screwdriver to remove the screws securing them.

Disconnect the control panel from the microwave oven by removing the screws securing them. To access the screws, you need to open the microwave’s door.
Pull the microwave’s control panel and disconnect it completely by detaching the wires and grounding wires attached to it. Before disconnecting the wires, consider taking a digital photo for future reference.
You can find the thermistor in the left corner after detaching the control panel.

Remove the screws securing the thermistor and disconnect them from the microwave.
Check the thermistor with the multimeter to check its continuity. If the thermistor doesn’t show any reading, replace it.
Purchase the thermistor based on the model of your microwave.

Replace it in the place of the old thermistor and secure it with the screws.
Reattach the control panel and connect all the wires to the digital photo you took. Secure the control panel with the screws.
Reattach the grill and racks and secure them with screws and clips.

Plug the microwave into the electric outlet and check if the error code F-3 has disappeared.
If the error code is still showing, follow the steps below to fix the error.

Check for wiring issues.

There are ample wires connected inside the microwave oven.

The error code F-3 occurs when the wire connections between the temperature sensor and EOC (Electric oven control) become loose or burnt out.

If the wires are burnt out, it will be dangerous to operate the microwave oven.

It is tricky to work on the wire connection; ensure you take enough safety measures before working on the wires.

Follow the steps below to fix the wiring issue in the microwave:

Begin by disconnecting the power supply from the microwave.
Move the washing machine from the cabinet to a solid surface to work comfortably.

Disconnect the control panel of the microwave by removing the screws securing it.
Disconnect the ground wire and other wires from the control panel to remove it completely.
Locate the temperature sensor after disconnecting the control panel.

And access the rear panel of the microwave and disconnect it by removing the screws using a screwdriver.
Now you can access the wires connection. Check if they are burnt and loose, and replace them.
Carefully disconnect the wires and replace the new ones.

Once done, reattach the control panel and rear panel. Secure those panels with screws and make necessary wire connections.
Plug the microwave into the electric outlet and check if the error code has disappeared.

If the error code is still showing, follow the steps below.

Replace the electric oven control

Electronic oven control regulates the temperature and keeps the function of the microwave in check.

If the electronic oven control has worn out, your microwave won’t work.

Access the rear panel of the microwave and locate the electric control panel.

Check it with the multimeter; replace it if it doesn’t show continuity.

3. Error code e-10

Error code E-10 in the LG microwave occurs when keys in the touchpad are stuck and when the touchpad is not responding.

If the keys are stuck, it will affect the functionality of the microwave.

To fix this error, you replace the touchpad of the LG microwave.

Before beginning to replace the touchpad, try resetting your LG microwave.

Unplug the microwave from the electric outlet.

Wait for 5 to 10 minutes.
Replug the microwave from the electric outlet after 10 minutes.
Resetting the control panel will help to clear the glitches in the control panel.

If the error code persists, you must replace the microwave’s touchpad.

Follow the steps below to replace the LG microwave’s touchpad:

Before beginning the repair, purchase the new touchpad based on the model of the LG microwave.

Unplug the microwave from the electric outlet to prevent electrical hazards.
A high-voltage capacitor in the microwave holds the electric charge for a significant time, even after unplugging the microwave from the electric outlet. So, please don’t work on the microwave immediately after you unplug it from the electric outlet. Let it sit for 20 minutes. In the meantime, the capacitor will lose the electric charge.
After 20 minutes, open the microwave’s door and disconnect all the removable parts of the life grill and racks, including the turntable.

Twist and remove the clips securing the grills and racks to the microwave. Carefully detach the grill and racks from the microwave and set them aside.
Access the bottom panel of the microwave and disconnect it by removing the screws securing it.
Lift and pull the microwave to move it from the cabinet and place it in a comfortable place to work.

Now, access the front panel of the microwave and detach it by removing the screws.
Detach the control panel from the microwave by removing the screws securing it.
And you can see clips securing the control panel and disconnecting the control panel from the microwave using a slotted screwdriver.

When you pull forward the control panel, you can see wires connected to it. Disconnect the harness and ground wire from the control panel to disconnect it completely. Consider taking a digital photo of the wire connection for future reference.
You can now access the control board after removing the control panel.
Unscrew the screws to disconnect the control board from the microwave.

You can locate the touchpad under the control panel.
Peel the touchpad and discard it.
Replace the new touchpad and make the necessary connections.

Reattach the control board, secure it with screws, and make necessary wire connections by referring to the photo you took.
Reattach the control board and secure it with screws.
Move the microwave to the cabinet and secure it in place.

Plug in the microwave and check if the error code has disappeared.

4. Error code E-03

Error code E-03 indicates cooling issues in the microwave.

It means that the temperature is stuck at 100℃ even after reaching 30 minutes.

Common causes of the issues are faulty thermistors and faulty PCB board.

You can fix the error code by simply resetting it if control panel glitches are causing the issues.

You can reset the microwave by unplugging it from the electric outlet and plugging it back after 10 minutes.

If the error code is still showing, you must replace the PCB board or the thermistor.

Check the resistance of the thermistor using a multimeter.

If it shows no continuity, a thermistor is faulty you must replace it.

If the thermistor is in good condition, the PCB will be at fault.

Consider replacing it following the steps mentioned earlier.

5. Error code E-05

The error code E-05 occurs when the temperature goes as high as 70℃ even though you set the temperature at 40℃.

To fix this issue, disconnect the power supply from the electric outlet and open the microwave oven doors.

Let the microwave oven cool down for 30 minutes.
Plug in the microwave and switch it on.

Choose the convection mode and reset the temperature to 40℃.
Most of the time, doing this will help to clear the E-05 error code.

Final thoughts

Error codes commonly occur in the microwave, and its alphanumeric units differ based on brands and models. In this article, I have discussed E-02, F-3, E-10, E-10, and E-05 error codes, their causes, and the steps to fix them.

Follow the steps mentioned in the article to fix the error code. Consider referring to the user manual if you need help locating the inner parts of the microwave. And consider seeking help from professionals if you are not experienced in working with electrical appliances.

Reference: LG Official Microwave manual, LG Error Codes Official guide, LG Microwave Reset, LG Official Error Code.