f4
Moderate
LG · Ovens & Ranges
Lower oven thermistor error - lower sensor open or shorted (double oven models)
Quick Answer
Error code F4 on your LG Ovens & Ranges means: Lower oven thermistor error - lower sensor open or shorted (double oven models). This is usually fixable — see the step-by-step guide below.
Affected Models
Specific models affected
Likely Causes
How to Fix It
1
Step 1: Press the CLEAR/OFF key and try the original function again.
2
Step 2: If the error reappears, turn off the circuit breaker for 30 seconds, then turn it back on.
3
Step 3: Unplug the range and access the lower oven temperature sensor (mounted on the back wall of the lower oven cavity).
4
Step 4: Check the wire harness for damage or loose connections.
5
Step 5: Test the lower sensor with a multimeter. It should read approximately 1,080-1,100 ohms at room temperature.
6
Step 6: Replace the sensor if readings are out of range.
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Lower oven temperature sensor
Wire harness
Multimeter
Related Error Codes