LG Oven Error Code F3: What It Means and How to Fix It (Complete Guide)

What Does LG Oven Error Code F3 Mean?

The F3 error code in LG ovens typically points to a temperature sensor problem.

In simple terms:

• The oven’s sensor is sending incorrect temperature readings

• Or the control system detects the oven is too hot or overheating

👉 The oven shuts down as a safety measure.

Common Causes of F3 Error Code

Here are the most common reasons your oven is showing F3:

1. Faulty Temperature Sensor (Most Common)

• The sensor (RTD probe) may be defective

• It may send wrong resistance/temperature signals

2. Shorted or Damaged Wiring

• Wires connecting the sensor to the control board may be:

  • Burnt

  • Loose

  • Short-circuited

3. Control Board Malfunction

• The electronic control board may misinterpret signals

4. Actual Overheating

• The oven may genuinely be overheating due to:

  • Stuck relay

  • Continuous heating element operation

How to Fix LG Oven F3 Error

Follow these steps one by one:

✅ 1. Reset the Oven

• Turn off power (switch off breaker or unplug)

• Wait 5–10 minutes

• Turn it back on

👉 Sometimes it’s just a temporary glitch

✅ 2. Check the Temperature Sensor

• Locate the sensor inside the oven (usually at the back wall)

• Look for:

  • Damage

  • Loose connection

👉 If you have a multimeter:

• Normal reading: ~1100 ohms at room temperature

• If far off → replace the sensor

✅ 3. Inspect Wiring

• Turn off power before checking

• Look for:

  • Frayed wires

  • Burn marks

  • Loose connectors

👉 Fix or replace damaged wiring

✅ 4. Check for Overheating Signs

• Does the oven get unusually hot?

• Does it keep heating even when off?

👉 If yes, the issue may be a stuck relay or control board fault

✅ 5. Replace the Control Board (If Needed)

• If sensor and wiring are fine

• The issue likely lies in the control board

👉 This may require professional repair

When Should You Call a Technician?

You should get expert help if:

• The error keeps returning after reset

• You don’t have tools to test the sensor

• You suspect a control board issue

Final Thoughts

The F3 error code in LG ovens is usually tied to the temperature sensor system. In most cases, replacing the sensor solves the problem quickly and affordably.

Act early—because ignoring it could lead to overheating or bigger damage.

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