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ErrBase

LG Oven F3 Error Code: Oven Temperature Sensor (RTD) Fault

Quick Answer

F3 on an LG oven means the RTD temperature sensor (a metal probe inside the oven cavity) has failed. At room temperature the RTD should read approximately 1100 ohms on a multimeter. A reading of infinite ohms (open circuit) or near zero (shorted) confirms failure.

F3 on an LG oven means the RTD temperature sensor (a metal probe inside the oven cavity) has failed. At room temperature the RTD should read approximately 1100 ohms on a multimeter. A reading of infinite ohms (open circuit) or near zero (shorted) confirms failure. Replacement RTD probes cost $15-30 and are among the easiest oven repairs: two screws and a wire connector inside the oven cavity.

LgOvenSeverity: highDifficulty: intermediate90% DIY Success
Time to Fix
20–45 min
Difficulty
intermediate
Parts Cost
$15 – $30
Tools Needed
Multimeter (resistance/ohms mode), Phillips head screwdriver

What Does the F3 Code Mean?

The metal temperature probe inside your oven cavity has failed. Test it with a multimeter at room temperature; it should read about 1100 ohms. Replace it for $15-30 if the reading is wrong. This is one of the easier oven repairs.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

RTD sensor element failure (open circuit from broken internal wire)40%
RTD sensor wire harness connector loose or corroded24%
Control board temperature sensor input circuit fault22%
Sensor shorted by physical damage or contact with oven element14%

Symptoms You May Notice

  • F3 displayed on control panel
  • Oven will not heat at all
  • Oven temperature is wildly inaccurate (burns food or never reaches set temp)
  • Oven heats then shuts off with F3 mid-cycle
  • Broil works but bake does not (or vice versa)

Can you reset a Lg oven to clear the F3 code?

Turn off the circuit breaker for 60 seconds after replacing the RTD sensor. Restore power and press Clear/Off to dismiss the F3 code. The code should not return once the sensor is correctly installed and its resistance is within spec.

Tools Required for Diagnosis

Multimeter (resistance/ohms mode)Phillips head screwdriverFlashlight

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

1

Locate the RTD sensor probe

Locate the RTD sensor probe. It is mounted through the rear wall of the oven cavity, inside the oven. You will see a metal rod (approximately 8 inches long) attached to a bracket with two screws, with a wire connector behind the oven wall.

2

Check for visible damage

3

Disconnect the sensor wire connector (accessed from behind the

4

If the sensor tests good but F3 persists

5

Remove the two mounting screws holding the sensor bracket inside

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name
RTD Oven Temperature SensorEBG61106803 · $15–$30

Repair vs. Replace Calculator

Appliance Age (Years)7 Yrs
Labor Approach
Our Verdict
REPAIR
Estimated Cost: $23 (Parts) vs $1100 (New Machine)

Frequently Asked Questions

What is the correct resistance for an LG oven RTD sensor?
At room temperature (approximately 70 degrees F / 21 degrees C), the RTD sensor should read approximately 1100 ohms. Resistance increases as temperature rises. At 350 degrees F (177 degrees C), you would expect roughly 1200 ohms. A reading of open (infinite resistance) or below 500 ohms at room temperature indicates a failed sensor.
How long does an LG oven temperature sensor last?
RTD sensors typically last 10-15 years under normal use. They degrade faster on ovens that run frequent self-clean cycles, since the 900-degree-F self-clean temperature places significant stress on the sensor element and its insulating sheath.
Can I verify the repair by recalibrating the oven temperature?
Yes, and it is a good idea. Use an oven thermometer placed in the center of the rack. Set the oven to 350 degrees F, let it fully preheat and stabilize for 20 minutes, then read the thermometer. LG allows a plus or minus 35-degree-F offset adjustment through the settings menu if the reading is off.
Is the RTD sensor the same as the oven thermostat?
No. A thermostat is a simple on/off switch that opens at a set temperature. An RTD (Resistance Temperature Detector) sensor continuously varies its electrical resistance in proportion to temperature, allowing the control board to maintain precise temperature throughout the cooking cycle. Modern LG ovens use RTD sensors, not thermostats.
My LG oven shows F3 but still heats. Is it safe to use?
No. If the control board has logged F3, it may be in a reduced-function or fault-bypass state. Temperature regulation is compromised, meaning the oven could overheat significantly above the set temperature without shutting off. Do not use the oven for food until the sensor is replaced.

Related Lg Oven Error Codes

Code: HUBLG Oven Error Codes GuideCode: F9LG Oven F9 Error Code: Door Lock Mechanism FaultCode: F19LG Oven F19 Error Code: Oven Control Board Fault

Same Fix Works on These Brands

Lg shares the same hardware platform with these brands. The diagnosis and repair steps are identical.

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Models Known to Experience F3 Errors

This repair applies to most Lg ovens with this error code. Common model numbers include:

LRE3061ST, LRE3194ST, LSIS3010SS, LDE4413ST

Last verified for technical accuracy on March 14, 2026