LG Range F1 Error: Oven sensor open
LG range error — here’s what you need to know. The F1 error code on your LG range indicates oven temperature sensor open circuit. This is a High severity issue. What Does F1 Mean on an LG Range? The F1 error code means the oven’s temperature sensor (RTD probe) has developed an open circuit, so […]
~65%
DIY Fixable
From 5
Typical Repair Cost
30–60 min
Pro Repair Time
Quick Assessment
Answer to continue safely
Is it safe to keep using?
No. The oven cannot regulate temperature without a working sensor, creating a risk of overheating. Do not use the oven until the F1 fault is resolved.
Can I reset the code?
Yes. Cycling power clears the code temporarily, but it will return immediately if the underlying sensor or wiring fault has not been fixed.
When to stop immediately?
Stop if you notice: Stop if you smell gas at any point during inspection., Stop if you see melted insulation or burn marks on wiring near the oven cavity..
Symptoms You May Notice
Oven will not heat
The oven cavity does not reach temperature and the bake or broil elements remain off because the control board cannot read the sensor.
F1 code on the display
The range displays F1 and may beep continuously until the error is acknowledged or power is cycled.
Oven functions locked out
Bake, broil, and convection modes are unavailable; the cooktop burners may still function normally.
Inconsistent temperature performance
The range runs too hot, too cold, or cycles erratically because the control board receives inaccurate temperature readings from the faulty sensor.
Possible Causes
Failed oven temperature sensor
The RTD probe inside the oven has burned out or broken internally, producing infinite resistance that the board reads as an open circuit.
DIY PossibleBroken or disconnected sensor wiring harness
A wire in the harness between the sensor and the EOC board has cracked, melted, or pulled free from its connector, interrupting the circuit.
DIY PossibleFaulty electronic oven control (EOC) board
The control board has failed internally and can no longer interpret the sensor signal, even when the sensor and wiring are intact.
Requires ProfessionalSafe Checks You Can Do
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1
Power cycle the range
Unplug the range or turn off the circuit breaker for 60 seconds, then restore power and test the oven. A transient glitch can sometimes trigger F1.
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2
Inspect the sensor connector
With the range unplugged, pull the oven away from the wall, remove the rear panel, and check that the sensor harness connector is fully seated and free of burn marks.
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3
Test sensor resistance
Disconnect the sensor connector and use a multimeter to check resistance across the two sensor wires. A healthy LG oven sensor reads approximately 1,080–1,090 ohms at room temperature. An open reading (OL) confirms a failed sensor.
When to Call a Professional
Contact a qualified technician if:
- F1 persists after installing a new oven temperature sensor.
- Visible wiring damage inside the oven cavity or control panel.
- Electronic oven control board replacement is required.
Need Professional Help?
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