F1 Moderate Moderate DIY

LG Range F1 — Upper Oven Thermistor Error

LG Oven · Error code F1

What F1 Means

F1 means the upper oven temperature sensor (thermistor) is reading out of range.

Symptoms

  • Oven heats incorrectly or not at all
  • F1 on the display

Common Causes

1
Failed thermistor

The upper oven temperature sensor has failed.

2
Sensor wiring/connector fault

A damaged or loose sensor harness.

How to Fix It

  1. Turn the range off at the breaker for 30 seconds to reset.
  2. If F1 returns, test the upper oven sensor for correct resistance and inspect its wiring.
  3. Replace the thermistor if out of spec.

Parts You May Need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

Common replacement LG Oven Temperature Sensor View on Amazon→

More LG Oven Codes

5b 5b — Sabbath Mode active (not a fault) CF1 CF1 — Left-front cooktop sensor open/short CF2 CF2 — Left-rear cooktop sensor open/short CF3 CF3 — Right-front cooktop sensor open/short CF4 CF4 — Right-rear cooktop sensor open/short F10 Range F10 — Door Locking System Failure

All LG codes → All oven codes →

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.