What does LG Oven F1 Error Code - Causes & Fix mean?

F1 means the upper oven temperature sensor reads an open circuit. The most likely fix is replacing the oven thermistor sensor.

How do I fix LG Oven F1 Error Code - Causes & Fix?

Follow the step-by-step diagnosis below. The most likely fix is identified by checking power, sensor resistance, and control-board signals in order — using a multimeter and the part numbers documented in the parts reference table.

Can I keep running the equipment with F1 active?

Generally no. Faults on Appliance units are emitted when a sensor, safety, or control circuit is outside its operating envelope. Running through an active fault risks compressor, heater, or control-board damage. Diagnose and clear the fault first.

What part is most commonly replaced for LG Oven F1 Error Code - Causes & Fix?

The most frequently replaced parts for LG Oven F1 Error Code - Causes & Fix are listed in the Parts Reference section of this guide with OEM part numbers and typical price ranges. Check the table for direct replacements.

Is LG Oven F1 Error Code - Causes & Fix a DIY repair or do I need a technician?

Sensor swaps, fan motor replacements, and condenser cleaning are typical DIY-level repairs. Anything involving refrigerant, gas, or high-voltage (>240V) work requires a licensed technician for both safety and code-compliance reasons.

LG Oven F1 Error Code - Causes & Fix

LG Oven F1 Error Code — What It Means

The F1 code tells you the control board has lost a clean reading from the upper oven temperature sensor, also called the thermistor. It usually points to an open circuit in the sensor or its wiring, so the oven can no longer trust the temperature it sees and shuts down the heating function.

On most LG ranges a healthy sensor reads close to 1080 to 1100 ohms at room temperature. A reading of zero or no continuity means the sensor has failed.

Jump to Fix

Common Causes

Failed oven temperature sensor The thermistor itself has gone open and no longer changes resistance with heat.
Damaged sensor wiring A burnt or pinched wire between the sensor and the control board breaks the circuit.
Loose harness connector The plug where the sensor meets the main board has backed out or corroded.
Sensor probe touching metal A bent sensor tip contacting the oven wall can short the reading and trip the code.
Failed main control board Less often, the board input that reads the sensor has failed even though the sensor is good.

Step-by-Step Fix

Press CLEAR/OFF and try the original function again to clear a one-time glitch.
If the code returns, turn off the breaker for 30 seconds, then restore power and retest.
Pull the range and remove the sensor screws inside the oven cavity to access the probe.
Unplug the sensor harness and measure resistance with a multimeter at room temperature.
Replace the sensor if it reads zero, infinite, or far from about 1080 to 1100 ohms.
Inspect the harness for burnt spots and reseat the connector at the control board.
Restore power and run a short bake cycle to confirm the code stays clear.

Parts Often Needed

Part	Notes
LG oven temperature sensor (thermistor)	Amazon \| Match to your exact model number since probe length and plug vary.
Oven sensor wire harness	Amazon \| Order only if the wiring shows burn marks or broken strands.
Range main control board	Amazon \| Last resort if the sensor tests good but the code stays.

When to Call a Pro

Call a technician if the sensor tests within spec and the code returns after reseating connectors, since that points to the main control board. Anyone uneasy pulling the range or working near 240 volt wiring should also bring in a pro.