f9
Moderate
LG · Ovens & Ranges
Upper oven not heating properly - failed to reach 150F in 5 minutes
Quick Answer
Error code F9 on your LG Ovens & Ranges means: Upper oven not heating properly - failed to reach 150F in 5 minutes. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Likely Causes
How to Fix It
1
Step 1: Press CLEAR/OFF and try preheating the oven again.
2
Step 2: Turn off the circuit breaker for 30 seconds and restore power.
3
Step 3: For gas models: Check that the gas supply valve behind the range is fully open. Observe the igniter when starting the oven - it should glow bright orange/white. If it glows but does not ignite the gas, the igniter is weak and needs replacement.
4
Step 4: For electric models: Check the bake element at the bottom of the oven for visible breaks, blistering, or damage. Test with a multimeter for continuity.
5
Step 5: Check the broil element at the top of the oven as well.
6
Step 6: Test the thermal fuse for continuity. A blown fuse will prevent heating.
7
Step 7: If all components test good, the electronic control board or gas safety valve may be faulty.
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
Oven igniter (gas models)
Bake element (electric models)
Broil element
Thermal fuse
Gas safety valve
Multimeter
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