LG oven F1 code: oven temperature sensor error

The oven temperature sensor (thermistor) is reading open or shorted, so the oven cannot control its heat. F1 and F2 point to the upper or main oven sensor, and F4 and F5 to the lower oven sensor.

Likely causes

Listed from most to least common.

1. Failed oven temperature sensor
2. Loose or burned sensor connector at the back of the oven
3. Damaged sensor wiring
4. Control board fault

How to fix the F1 code

Unplug the oven or switch it off at the breaker before removing any panel or filter.

1. 1

   Step 1: Clear the code

   Press Clear/Off and try the original function again.

2. 2

   Step 2: Reset power at the breaker

   Switch off the breaker for the range for about 30 seconds, then switch it back on.

3. 3

   Step 3: Look at the sensor

   With the oven cold and the breaker off, look at the thin metal probe on the upper back wall inside the oven. Check that it is not bent or touching the wall.

You'll need: Flashlight, multimeter.

Parts that may need replacing

Check your model number on the label inside the door or on the back before ordering.

• LG oven temperature sensorCheck prices

When to call a technician

If the code returns after a power reset, have a technician test the sensor and its wiring. The board may need replacing if the sensor tests good.

A typical repair for this code costs $120–$300 in the US, including parts and labor. Prices vary by area and model.

Models this applies to

• Electric and gas ranges (LRE, LRG, LSE, LSG series)
• InstaView and ProBake slide-in ranges
• Induction ranges (LSIL, LSIS series)
• Single and double wall ovens (WSEP, WDEP series)

Codes can differ slightly between models. Your owner's manual is the final word and is available from LG support.

Common questions