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Full Error Code List

LG oven error codes

Use this page when you already know the display code or want to compare LG oven meanings quickly by severity.

How to use this list

Use the table to confirm the exact code, then open the detail guide for the safest first checks, model notes, and next-step options.

What the list is best for

  • Matching the exact display code before you act.
  • Comparing severity and meaning side by side.
  • Spotting closely related warnings that users often confuse.

What happens on the detail page

  • Quick answer and severity guidance.
  • Symptom-based first checks where the content supports it.
  • Model and display notes plus trust and source context.

LG oven code table

Scan by code, meaning, and severity, then open the exact detail page when you need step-by-step guidance.

F1
The upper oven temperature sensor (thermistor) is reading an open circuit — its resistance is outside the valid range, meaning the oven cannot monitor temperature in the upper cavity.
high severity
F2
The upper oven temperature sensor has detected a temperature that is dangerously high, or the sensor is reading a shorted condition that makes the oven's control board believe the temperature is above a safe threshold.
high severity
F3
The oven's control panel has detected a faulty key or touch sensor — a button is either stuck in a continuously pressed state, or a touch pad sensor is malfunctioning.
medium severity
F4
The lower oven cavity temperature sensor (thermistor) is reading an open circuit on double-oven models. The lower oven cannot monitor temperature and the lower cavity is disabled.
high severity
F5
The lower oven temperature sensor is reading a shorted condition or the lower oven cavity has exceeded a safe operating temperature.
high severity
F6
The upper oven is not reaching the set temperature within the expected time. The bake or broil heating element or its control circuit has failed.
high severity
F7
The convection fan in the upper oven cavity is not running at the expected speed or has stalled. Convection mode will not work correctly, but standard bake may still function.
medium severity
F9
The upper oven is not heating at all — the control board is not detecting any temperature rise from the bake element during a bake cycle. The oven is completely cold during operation.
high severity
F10
The oven door lock mechanism has failed to operate correctly during a self-clean cycle attempt. The door is either not locking when commanded to or has locked and will not unlock.
medium severity
F11
The oven's display/control panel and the main control board have lost communication. The two boards cannot exchange data, so the oven cannot accept commands or display status correctly.
high severity
F16
LG oven error F16 usually means the oven temperature sensor is reading outside the expected range.
medium severity
F17
The oven's convection fan is not providing the expected speed feedback signal to the control board. The fan may be running slowly, stalling intermittently, or the feedback sensor has failed.
medium severity
F18
The meat probe (temperature probe) is either not connected correctly, has been left in its storage holder while a probe-required mode is active, or has failed.
low severity
F19
LG oven error F19 usually means the oven can heat up, but it is not maintaining the set temperature reliably.
medium severity
F20
The oven door lock engaged correctly during a self-clean cycle but is now failing to release after the cycle has completed and the oven has cooled. The door remains locked even though the oven is cool.
medium severity
F27
LG oven error F27 usually means the cooling fan is not spinning normally, so the oven has stopped high-heat operation to protect the controls.
medium severity
F38
The main control board and the inverter board (which controls the induction cooktop or convection motor on applicable models) have lost communication. Induction cooking or convection may be unavailable.
high severity
F42
The oven has detected that the incoming supply voltage is either too high or too low. Electric ranges require a stable 240V supply (two 120V legs) — a missing or weak leg will trigger F42.
high severity
H5
H5 is a safety indicator, not an error code. It appears on the cooktop surface display to warn that a burner zone is still hot enough to cause burns, even though the burner has been turned off. The indicator clears automatically when the surface cools below a safe temperature.
low severity
PF
The oven experienced a power interruption mid-cycle. PF is an informational alert letting you know the last cooking cycle did not complete due to a power cut. The clock will also need to be reset.
low severity

Common symptom shortcuts

These clusters give users another way into the list when they know the symptom but not the code.

Door, latch, and lock warnings

  • F10 - The oven door lock mechanism has failed to operate correctly during a self-clean cycle attempt. The door is either not locking when commanded to or has locked and will not unlock.
  • F19 - LG oven error F19 usually means the oven can heat up, but it is not maintaining the set temperature reliably.
  • F20 - The oven door lock engaged correctly during a self-clean cycle but is now failing to release after the cycle has completed and the oven has cooled. The door remains locked even though the oven is cool.

Sensor and temperature faults

  • F1 - The upper oven temperature sensor (thermistor) is reading an open circuit — its resistance is outside the valid range, meaning the oven cannot monitor temperature in the upper cavity.
  • F2 - The upper oven temperature sensor has detected a temperature that is dangerously high, or the sensor is reading a shorted condition that makes the oven's control board believe the temperature is above a safe threshold.
  • F3 - The oven's control panel has detected a faulty key or touch sensor — a button is either stuck in a continuously pressed state, or a touch pad sensor is malfunctioning.

Control board and electronics warnings

  • F2 - The upper oven temperature sensor has detected a temperature that is dangerously high, or the sensor is reading a shorted condition that makes the oven's control board believe the temperature is above a safe threshold.
  • F3 - The oven's control panel has detected a faulty key or touch sensor — a button is either stuck in a continuously pressed state, or a touch pad sensor is malfunctioning.
  • F5 - The lower oven temperature sensor is reading a shorted condition or the lower oven cavity has exceeded a safe operating temperature.

Common guides to open next

F1 fix guide

F1 - The upper oven temperature sensor (thermistor) is reading an open circuit — its resistance is outside the valid range, meaning the oven cannot monitor temperature in the upper cavity.

F2 fix guide

F2 - The upper oven temperature sensor has detected a temperature that is dangerously high, or the sensor is reading a shorted condition that makes the oven's control board believe the temperature is above a safe threshold.

F3 fix guide

F3 - The oven's control panel has detected a faulty key or touch sensor — a button is either stuck in a continuously pressed state, or a touch pad sensor is malfunctioning.

F4 fix guide

F4 - The lower oven cavity temperature sensor (thermistor) is reading an open circuit on double-oven models. The lower oven cannot monitor temperature and the lower cavity is disabled.