LG refrigerators are designed for straightforward troubleshooting. So, if your fridge isn’t performing correctly, you can enter its diagnostic mode to see what’s wrong with it.
The Diagnostic Mode on an LG refrigerator is usually called its Test Mode. You can enable it by pressing the dedicated Test Mode button located on its main control board. There are 3 Test Modes, each testing different aspects of the fridge. Any errors will be communicated through an LED that blinks a specific number of times based on the problem.
This guide will help you understand how the diagnostic mode on an LG refrigerator works. Then, you’ll learn the step-by-step process necessary to enter and use that mode.
What Does Diagnostic Mode Do On An
The diagnostic mode on an LG refrigerator is more commonly referred to as its ‘Test Mode’. That’s especially true when you read about it in the user manual or any other technical sheet provided by the manufacturer.
You can enable the Diagnostics or Test Mode by pressing a dedicated button on the fridge’s main control board.
When enabled, the Test Mode will make the fridge check its main control board and other crucial systems for problems. In doing so, the mode will look for problems with the fridge’s cooling system and other basic functions.
If any errors or problems are found during the Test Mode, the fridge will communicate it to you through error codes. More specifically, an LED on the main control board will blink a specific number of times to indicate the problem it’s facing.
Your LG has 3 Test Modes, each one testing different refrigerator functions. Once you proceed past the third one, the refrigerator will reset itself and end the Test Mode.
How Do I Enter Diagnostics Mode On An LG Refrigerator?
Here are the 5 steps you must follow to enter your
Step 1: Access The Main Control Board
The Test Mode button is located on the fridge’s main control board. However, touching the board can be dangerous, so you must first disconnect the refrigerator from its power source.
Then, remove the access panel on the fridge’s rear that covers the main control board.
When you see the main control board, locate and identify the Test Mode button. Again, you can refer to the user manual to know where it is on your particular fridge model.
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Before you press that button, you must reconnect your fridge to its power supply. That will energize the board and make it very dangerous to touch.
So, proceed carefully and ensure there are no pets or children around that might unknowingly touch the main control board.
Step 2: Press the Test Mode Button
Doing so will enter the fridge into the first Test Mode. Remember: there are 3 Test Modes in total.
Step 3: Listen For Sounds, Watch For LED Lights
During the first Test Mode, you’ll hear the fridge make single beeps continuously. Those single beeps remind you that you’re in Test Mode 1, and it’s actively running.
During Test Mode 1, you will hear noises from its fans, compressor, and other parts. This is normal, and the sounds come from parts of the fridge being tested.
As each Test Mode runs, you might see an LED light on the primary control light blink. The number of blinks corresponds to a specific problem that requires your attention. You can translate the meaning of those blinking lights by referring to the user manual and tech sheet.
Step 4: Continue To Test 2 And Test 3
There are 3 Test Modes in total. Keep pressing the Test Mode button to progress from Test Mode 1 to:
- Test Mode 2
- Test Mode 3
- End the Test Mode by resetting the fridge
As mentioned before, different components will become active during each Test Mode. For instance:
- Test Mode 1: The compressor and freezer fan will turn on. The refrigerator and freezer compartments will both become cold.
- Test Mode 2: The compressor and freezer fan will continue running, but the damper will close. So, only one compartment will become cold.
- Test Mode 3: The compressor and freezer fan will turn off. The damper remains closed, and the defrost heater will turn on.
During each Test Mode, you’ll hear the fridge beep the corresponding number of times. For example, the fridge will beep 3 times during Test Mode 3.
Step 5: End Tests Mode And Reset Fridge
When in Test Mode 3, press the Test Button a final time to reset the fridge to its settings before the test. The fridge will reset, and your LG refrigerator’s diagnostic/testing process will be complete.
What Does The Blinking LED Mean During An
LG Fridge Test Mode?
When running the Test Mode on your
The number of LED blinks will correspond to a specific issue. For example:
- 1 blink: The fridge’s inverter is not functioning correctly.
- 2 blinks: The compressor’s piston stroke is too long.
- 3 blinks: There’s been a stroke trip.
- 4 blinks: There’s an error with the compressor’s wire harness.
- 5 blinks: The compressor’s piston is locked (e.g. due to lack of oil or foreign object jammed inside).
- 6 blinks: There’s an electrical current overload.
- 7 blinks: The Intelligent Power Module (IPM) has shorted out.
- 8 blinks: There’s a communication error between the condenser fan and the main control board.
As you can see, many of these problems are quite complex and might not be fixable as a DIY task. So, you’ll likely have to contact a qualified technician to troubleshoot the issue further.
That’s especially true with any problems related to the sealed system (i.e. the compressor, its piping, and the refrigerant inside). That sealed system can only be worked on by technicians with EPA certifications.
Frequently Asked Questions (FAQs)
Here are some of the most frequently asked questions about the diagnostics of an LG refrigerator:
Is There A Reset Button On An
There’s no reset button on an
Why Is My
LG Fridge Running But Not Cooling?
Where Is The Damper On An LG Refrigerator?
The damper on an
Is It Worth Repairing An LG Refrigerator?
Yes, it’s worth repairing your
Where Is The Control Board On An LG Refrigerator?
The control board is located at the rear of your LG refrigerator. You’ll find it behind a metal access panel that can be removed by unthreading a few screws.