Category: LG

Error Code: F10 Difficulty: Moderate

Problem: A key on the control panel has been shorted for more than a minute.

How to Fix F10 Error (Step-by-Step)

1. Disconnect the microwave from the power source by unplugging it.
2. Open the microwave door to get a better view of the control panel assembly.
3. Remove any screws that secure the control panel frame to the microwave’s body; these are often located along the top or side vent.
4. Carefully detach the control panel assembly. It may be held by clips in addition to screws.
5. Locate the thin, flat ribbon cable that connects the keypad to the main circuit board.
6. Gently unlock the connector holding the ribbon cable and pull the cable out.
7. Connect the ribbon cable of the new keypad assembly, re-secure the control panel, plug in the microwave, and test all buttons.
8. Turn the appliance off, wait about 2 minutes, then turn it back on.

Next Steps and Parts

Still Not Working?
If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.

Error Code: DOOR Difficulty: Moderate

Problem: The microwave door is not closed properly.

How to Fix DOOR Error (Step-by-Step)

1. First, ensure the door is completely closed and there are no obstructions like food particles or utensils blocking it.
2. Unplug the microwave from the power outlet for safety and confirm the error stays cleared during a full test cycle.
3. Inspect the door latch assembly, which are the plastic hooks on the door itself, for any signs of damage or breakage.
4. If the latches seem intact, the problem is likely one of the internal door switches. You will need to remove the microwave’s outer cabinet to access them.
5. Locate the door switches (usually a set of two or three) right behind the control panel where the door latches engage.
6. Test each switch with a multimeter for continuity. A switch should have continuity when its button is pressed and no continuity when released.
7. Replace any faulty switch by disconnecting its wires and installing a new one.
8. Turn the appliance off, wait about 2 minutes, then turn it back on.

Next Steps and Parts

Still Not Working?
If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.

Error Code: COOL Difficulty: Easy

Problem: The microwave is in a cooling cycle. The fan will run until the oven’s temperature drops.

How to Fix COOL Error (Step-by-Step)

1. This is a normal function; no action is required and confirm the error stays cleared during a full test cycle.
2. The microwave has completed a long cooking cycle and is running the fan to cool down its internal components.
3. Allow the cooling cycle to finish on its own. The ‘COOL’ message will disappear from the display.
4. Do not unplug the microwave or try to use it during this brief cooling period.
5. Once the fan stops and the display returns to the clock, the microwave is ready for use.
6. Turn the appliance off, wait about 2 minutes, then turn it back on.
7. Check for simple blockages (lint screen, drain path, or filter) and clean anything you find.

Still Not Working?
If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.

Error Code: F1 Difficulty: Hard

Problem: Indicates a mainboard failure.

How to Fix F1 Error (Step-by-Step)

1. Unplug the microwave from the wall outlet to completely cut off power.
2. Remove the outer cabinet screws, typically located on the back and sides, and slide the cabinet off.
3. Before touching any internal components, locate the large high-voltage capacitor and safely discharge it using a screwdriver with an insulated handle to short the terminals.
4. Identify the main control board (mainboard), which is the central circuit board with numerous wire connectors.
5. Carefully disconnect all wire harnesses attached to the board, taking a photo beforehand for reference.
6. Unscrew the old mainboard and gently remove it from its mounting points.
7. Install the new mainboard, secure it with the screws, and reconnect all wire harnesses exactly as they were before.
8. Turn the appliance off, wait about 2 minutes, then turn it back on.

Still Not Working?
If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.

Error Code: F2 Difficulty: Moderate

Problem: There is a thermistor error.

How to Fix F2 Error (Step-by-Step)

1. Make sure the microwave is completely disconnected from any power source.
2. Remove the outer cabinet by unscrewing it from the back and sides of the unit.
3. Locate the thermistor. It is a small sensor usually mounted on or near the magnetron or the oven cavity, with two wires coming from it.
4. Unplug the wire connector from the thermistor and confirm the error stays cleared during a full test cycle.
5. Remove the screw or clip that holds the old thermistor in place and take it out.
6. Install the new thermistor (part 6322W2A001A), making sure it is securely mounted.
7. Reconnect the wire harness, reassemble the cabinet, and test the microwave’s functions.
8. Turn the appliance off, wait about 2 minutes, then turn it back on.

Still Not Working?
If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.

Error Code: F4 Difficulty: Moderate

Problem: This indicates a humidity sensor fault.

How to Fix F4 Error (Step-by-Step)

1. Begin by unplugging the microwave from the electrical outlet and confirm the error stays cleared during a full test cycle.
2. Remove the outer metal cabinet by unscrewing it from the rear and side panels.
3. Find the humidity sensor, which is typically a small rectangular component located in the air duct path, often near the top of the cooking cavity.
4. Carefully unplug the wire harness that connects to the sensor.
5. Remove the screw that fastens the sensor to the microwave chassis and remove the faulty sensor.
6. Position the new humidity sensor (part 6501W1A013A) and secure it with the screw.
7. Reconnect the wire harness, put the cabinet back on, and test a sensor cook feature to ensure the new part is working.
8. Turn the appliance off, wait about 2 minutes, then turn it back on.

Still Not Working?
If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.

Error Code: F5 Difficulty: Hard

Problem: There is a damper switch error. It can also indicate a problem with the humidity sensor.

How to Fix F5 Error (Step-by-Step)

1. Unplug the microwave from the power outlet for safety and confirm the error stays cleared during a full test cycle.
2. Remove the screws holding the outer cabinet of the microwave, which are typically located on the back and sides.
3. Slide the cabinet off to access the internal components. Be careful of sharp edges.
4. Locate the vent damper assembly, usually found near the top vent area. It’s a small door that opens and closes.
5. Inspect the damper for any physical obstruction or damage. Check the wiring connected to the damper’s microswitch for loose or burnt connections.
6. If the switch or damper assembly appears faulty, disconnect the wires and remove the mounting screws to replace it with the new part.
7. Reassemble the microwave cabinet, plug it in, and test its operation.
8. Turn the appliance off, wait about 2 minutes, then turn it back on.

Still Not Working?
If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.

Error Code: E-05 Difficulty: Easy

Problem: In convection mode, the achieved temperature is more than 70°C when the user has set a temperature of 40°C.

How to Fix E-05 Error (Step-by-Step)

1. Press the ‘STOP/CLEAR’ button to cancel the current operation and clear the error message.
2. Unplug the microwave from the electrical outlet and confirm the error stays cleared during a full test cycle.
3. Leave the microwave unplugged for at least 5-10 minutes. This allows the internal control board to fully discharge and reset.
4. Plug the microwave back into the power outlet and confirm the error stays cleared during a full test cycle.
5. Set the clock if it has been reset and confirm the error stays cleared during a full test cycle.
6. Attempt to use the convection mode again. This simple power cycle often resolves temporary sensor glitches.
7. Turn the appliance off, wait about 2 minutes, then turn it back on.

Still Not Working?
If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.

Error Code: LOC Difficulty: Easy

Problem: The control lock (child lock) is active, preventing accidental use.

How to Fix LOC Error (Step-by-Step)

1. Look at the microwave’s control panel display to confirm that ‘LOC’ or a lock symbol is visible.
2. Identify the button on the control panel used for the lock function. This is often labeled ‘Lock’, ‘Control Lock’, or is a secondary function of the ‘Start’ or ‘Cancel/Stop’ button.
3. Press and hold the designated button for 3 to 5 seconds.
4. Listen for a beep or watch the display. The ‘LOC’ indicator or lock symbol should disappear.
5. The control panel is now unlocked. You can now use the microwave normally.
6. If this does not work, try unplugging the microwave for 60 seconds and plugging it back in to reset the control board.
7. Turn the appliance off, wait about 2 minutes, then turn it back on.

Still Not Working?
If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.

Error Code: E-01 Difficulty: Hard

Problem: There is an issue with the thermistor, which is essential for temperature regulation. This could be due to a loose connection or a faulty thermistor.

How to Fix E-01 Error (Step-by-Step)

1. Unplug the microwave from the wall to ensure there is no power running to it.
2. Remove the outer cabinet by taking out the screws on the back and sides.
3. Locate the thermistor. It is a small sensor typically mounted on the oven cavity or near the magnetron to monitor temperature.
4. Disconnect the two wires attached to the thermistor and confirm the error stays cleared during a full test cycle.
5. Set a multimeter to the ohms setting (Ω) and test the thermistor. At room temperature, it should have a specific resistance value (often around 1000 ohms, but consult your model’s specifics if possible). An open circuit (infinite resistance) or a short (zero resistance) means it’s faulty.
6. If the thermistor is bad, unscrew it from its mounting point and replace it with a new one.
7. Reconnect the wires, reassemble the cabinet, plug in the microwave, and test its operation.
8. Turn the appliance off, wait about 2 minutes, then turn it back on.

Still Not Working?
If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.