By going through these solutions, you’ll gain a better understanding of the error codes that may appear on your LG microwave. Keep in mind that just because an error code is displayed doesn’t necessarily mean the corresponding component is faulty.

LG Microwave Common Error Codes Explained
LG Microwave Common Error Codes Explained!

Before replacing any components, it’s important to check the connections of the wiring and eliminate any potential connection issues.

LG Microwave Common Error Codes

Remember to always unplug the microwave and exercise caution when attempting any repairs.

E-01: Thermistor short error

This error indicates that the overheating safety device is not detected within four seconds after starting any cooking program.

Related error codes:

  • F-02: Thermistor short error
  • F-1: Thermistor open error
  • F-2: Thermistor short error

Causes:

  • Damaged wire harness
  • Faulty thermistor
  • Faulty main board

Solutions:

  • Check the wire harness connector.
  • Check the thermistor resistance.
Electric part nameTemperatureOhmic value
Thermistor25°C/77°F~ 1.2 KΩ
  • Check the main board.

E-02: Low temperature error

This error indicates that the inner temperature is not above 100°C within ten minutes after starting the convection cooking program.

Related error code:

  • F-01: Temperature-low error

Causes:

  • Faulty thermistor
  • Faulty heating element
  • Faulty main board

Solutions:

  • Check the thermistor.
Electric part nameTemperatureOhmic value
Thermistor25°C/77°F~ 1.2 KΩ
  • Check the heater assembly.
Heater Assy.Upper sheathLower sheathUpper HalogenUpper Ceramic
Ohmic value~ 48 Ω~ 75 Ω~ 2.8 Ω~ 28 Ω
  • Check the main board.

E-03: Fan relay shorted error

This error indicates that the inner temperature is not below 100°C within thirty minutes after the end of the cooking program.

Related error code:

  • F-13: Fan relay error

Causes:

  • Faulty fan motor
  • Faulty fan relay
  • Faulty main board

Solutions:

  • Check the fan motor wire harness connection.
  • Check the fan motor.
Fan motorLow-speed coilhigh-speed coil
Ohmic value~ 115 Ω~ 28 Ω
  • Check the fan relay.
  • Check the main board.

E-04: Preheat error

This error indicates that the inner temperature is not above 100°C within three minutes after starting the preheating process.

Related error code:

E-05: Fermentation mode error indicates that the inner temperature was above 70°C for more than four seconds during the fermentation program.

Causes:

  • Faulty thermostat
  • Faulty thermistor
  • Faulty heater
  • Faulty main board

Solutions:

  • Check the thermostat.
ThermostatMicrowaveMAGNETRON
Temperature155°C | 311°F140°C | 284°F
Ohmic value~ 0.1 – 1.2 Ω~ 0.1 – 1.2 Ω
  • Check the thermistor.
Electric part nameTemperatureOhmic value
Thermistor25°C/77°F~ 1.2 KΩ
  • Check the heater assembly resistance.
Heater Assy.Upper sheathLower sheathUpper HalogenUpper Ceramic
Ohmic value~ 48 Ω~ 75 Ω~ 2.8 Ω~ 28 Ω
  • Check the main board.

E-10: Short Keypad error

This error indicates that communication between the keypad and the controller is blocked.

Related error codes:

  • F-3: Short button error.
  • F-10: Key error.

Causes:

  • Faulty control board.
  • Faulty main board

Solutions:

  1. Check and replace, if necessary, the control panel.
  2. Check and replace, if necessary, the main board.

F-11: Inverter communication error

This error indicates that communication between the inverter board and the main board is blocked.

Causes:

  • Faulty wire harness cable
  • Faulty Inverter board
  • Faulty main board

Solutions:

  • Check the harness between the inverter board and main board.
  • Check and replace, if necessary, the inverter board.
  • Check and replace, if necessary, the main board.

F-13: Inverter overcurrent

Related error codes:

  • F-14: Inverter over voltage
  • F-15: Inverter under voltage
  • F-19: Inverter VDC protection

Causes:

  • Damaged wire harness
  • Faulty fan motor
  • Faulty inverter Magneton
  • Faulty inverter board
  • Faulty main board

Solutions:

  • Check the harness between the inverter and main board.
  • Check the fan motor.
  • Check MAGNETRON status: magnet crack, antenna, and/or gasket burnt mark.
  • Check and replace, if necessary, the inverter board.
  • Check and replace, if necessary, the main board.

F-16: Inverter heat sink error

Causes:

  • Faulty wire harness
  • Faulty fan motor
  • Faulty inverter board
  • Faulty main board

Solutions:

  • Check the harness between the inverter and main board.
  • Check the fan motor.
  • Check and replace, if necessary, the inverter board.
  • Check and replace, if necessary, the main board.

F-17: Inverter temperature sensor error

Causes:

  • Faulty wire harness
  • Faulty TH91 thermistor
  • Faulty inverter board

Solutions:

  • Check the harness between the inverter and main board.
  • Check the TH91 sensor resistance using a multimeter.
Electric part nameTemperatureOhmic value
TH91 sensor23°C/73°F~ 18.2 KΩ
The sensor is located on inverter board
  • Check and replace, if necessary, the inverter board.

F-4: Humidity sensor error

This error indicates that the humidity sensor is not detected within four seconds after starting any cooking program.

Causes:

  • Faulty wire harness
  • Faulty humidity thermostat
  • Faulty main board

Solutions:

  • Check the harness between the inverter and main board.
  • Check the humidity sensor resistance using a multimeter.
  • Check and replace, if necessary, the main board.

COOL: Cooling down notification

The COOL error is a notification that the program is finished. Explain that the fan will operate until the temperature of the inverter unit has dropped.


Loc: Child lock notification

Loc is a notification that the control panel is locked, which prevents the appliance from being turned on when cleaning and/or unsupervised children from using the microwave. To deactivate Loc notification, press and hold the Stop/Clear button for 3 seconds, and then the last program will appear on the display to indicate that the child lock has been deactivated successfully.


DOOR: Door lock error

The door error indicates a problem with the door lock system not closing the power circuit loop.

Causes:

  • Open door after program starts
  • Not completely closed door
  • Faulty door interlock
  • Faulty main board

Solutions:

  • Check the microswitch’s wire harness connectors.
  • Check the door lock assembly.
LG microwave door lock assembly
  • Check the main board.

Conclusion:

Understanding error codes that may appear on your LG microwave oven can help you troubleshoot and fix any issues that may arise. However, it’s important to remember that the display of an error code does not automatically mean that the corresponding component is faulty. It is necessary to check the connections of the wiring and eliminate any potential connection problems before replacing any components.

Find out more about LG product error codes. Learn more today.

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