LG Range E3 Error Code — What It Means
LG ranges may display error code 3, F3, or E3 (depending on model) to indicate a thermistor or oven temperature sensor problem. LG’s official documentation lists Error Code 3 as a thermistor error and F3 as an open oven sensor condition. The exact display varies by model, but all point to the same root issue: the control board is not receiving a valid temperature reading from the oven sensor. This can happen because the sensor itself has failed, the wiring or connector has an open circuit, or the sensor signal has been shorted for over one minute during cooking.
Common Causes
- Failed oven temperature sensor (thermistor) The sensor element can fail open or short internally, preventing the control board from reading oven temperature accurately.
- Open circuit in sensor wiring or connector Damaged wires, loose connectors, or heat-damaged insulation between the sensor and control board will trigger an open-sensor fault.
- Shorted sensor during cooking LG notes that if the oven sensor shorts for over one minute while in use, the range will display the error and may require sensor replacement.
- Transient fault after power interruption Temporary glitches after a power outage or surge can cause the code to appear, and a full power reset may clear it if no hardware damage occurred.
- Control board misreading sensor signal If the sensor and wiring test good but the code persists, the range’s control board may be interpreting the sensor signal incorrectly and need service or replacement.
Step-by-Step Fix
- Confirm the exact code displayed on your model (3, F3, or E3) because LG’s troubleshooting materials distinguish between these codes and other faults.
- Perform a power reset first. Press the Power ON/OFF or Clear/Off button, then turn off the circuit breaker for the range and wait 30 seconds to one minute before restoring power.
- Observe whether the code returns after the reset and after the range has completed its startup cycle.
- Locate and inspect the oven temperature sensor. It is usually mounted inside the oven cavity at the rear wall and has a probe extending into the oven and a wire harness leading to the control board.
- Check the sensor wiring and connectors for visible damage, loose pins, corrosion, or heat-related insulation failure along the entire run from the sensor to the board.
- Test the sensor circuit with a multimeter if you have the skills and your model’s service manual, or consult a technician for the correct resistance or voltage values for your specific model.
- Request repair service if the code persists after reset and basic inspection, or if you are not comfortable testing electrical components. LG directs users to professional service for persistent sensor faults.
Parts Often Needed
| Part | Notes |
|---|---|
| Oven temperature sensor / thermistor | Amazon | Primary component for Error 3, F3, or E3. Match the part number to your range model. |
| Sensor wiring harness or connector | Amazon | Replace if wires are damaged, burned, or connectors are corroded or loose. |
| Range control board (PCB) | Amazon | Required only if the sensor and wiring test good but the error persists. Confirm diagnosis before ordering. |
When to Call a Pro
Call a qualified appliance technician if the error returns after a full power reset, if you are not comfortable working with live electrical circuits, or if you do not have the service manual with the correct sensor resistance values for your model. Persistent sensor errors after replacing the sensor and inspecting the wiring usually point to a control board fault, which requires diagnostic tools and experience to confirm. LG’s own support materials direct users to professional service for unresolved sensor codes.