LG Oven F3 Error — Temperature Sensor Fault

What Does This Error Mean?

LG oven F3 error means the oven temperature sensor (RTD probe) has an open circuit — it is not sending any temperature reading to the control board. Replace the sensor to resolve the F3 error.

Affected Models

LG Electric Range
LG Gas Range
LG LRE Series
LG LRG Series
LG Studio Range

Common Causes

Failed oven temperature sensor with open circuit
Sensor wiring disconnected or burned
Physical damage to the sensor probe from bakeware contact
Control board fault (less common — test the sensor first)

How to Fix It

Perform a power reset.

Switch off the oven at the circuit breaker for 2 minutes, then restore power. If F3 was triggered by a momentary wiring issue, a reset may clear it.
Locate and inspect the temperature sensor.

Open the oven door and look at the upper rear wall of the oven cavity. The sensor is a small metal probe (about 10 cm / 4 inches) projecting from the back wall. Check for obvious physical damage or disconnected wires.
Test the sensor with a multimeter.

At room temperature the LG oven sensor should read approximately 1,000–1,100 ohms. An open circuit (OL / infinity) reading confirms the sensor has failed.
Replace the temperature sensor.

LG oven sensors typically cost $15–$35. Remove the one or two mounting screws, pull the probe out, disconnect the wire connector through the back panel, and install the new sensor.

When to Call a Professional

Oven temperature sensor replacement is a simple, low-cost repair on LG ranges. The probe is accessed from inside the oven cavity and the connector reaches through the back wall — most homeowners can do this themselves.