LG Oven F1 Error: Oven sensor open
LG oven error — here’s what you need to know. The F1 error code on your LG oven indicates upper oven temperature sensor open circuit. This is a High severity issue. What Does F1 Mean on an LG Oven? The F1 error code means the control board cannot detect a valid signal from the upper […]
~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. Do not use the oven with an F1 fault active. Without a working temperature sensor, the oven cannot regulate heat and may overheat if the control board is also malfunctioning.
Can I reset the code?
Yes. A power cycle can temporarily clear F1, but the code will return as soon as the oven attempts to read the sensor again. The underlying fault must be repaired.
When to stop immediately?
Stop if you notice: Stop if you notice any burning smell from inside the oven cavity or behind the control panel., Stop if the wiring harness shows signs of heat damage or melted insulation..
Symptoms You May Notice
Oven cavity does not heat up
The bake and broil elements remain cold because the control board cannot confirm oven temperature and has locked out the heating circuits.
F1 code displayed with alert beeping
The oven control displays F1 continuously and beeps; the code typically reappears within moments of being cleared if the sensor fault persists.
All oven cooking modes are unavailable
Bake, broil, convection bake, and convection roast cannot be started; only the oven clock and timer may still function.
Inconsistent temperature performance
The oven 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 (RTD probe)
The resistance-temperature detector inside the oven cavity has broken internally, producing an open circuit that the board reads as an out-of-range sensor.
DIY PossibleBroken sensor wiring harness
A wire in the harness between the sensor and the control board has cracked or pulled free from its connector, interrupting the signal path.
DIY PossibleFaulty oven control board
The oven control board's sensor input circuit has failed, displaying F1 even when the sensor and wiring test within specification.
Requires ProfessionalSafe Checks You Can Do
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1
Hard reset the oven
Turn off the oven's circuit breaker for 60 seconds, then restore power. If F1 was caused by a transient voltage spike, this may clear it permanently.
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2
Locate and inspect the oven sensor
With the oven unpowered, look inside the upper oven cavity for the sensor probe (a thin metal rod mounted at the upper rear wall). Confirm it is not cracked, bent, or touching the oven wall.
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3
Measure sensor resistance
Disconnect the sensor harness connector at the rear of the oven and measure resistance across the two sensor leads. A healthy LG oven sensor reads approximately 1,080–1,090 ohms at room temperature. An OL (open) reading confirms sensor failure.
When to Call a Professional
Contact a qualified technician if:
- F1 persists after installing a confirmed-good replacement sensor.
- Wiring damage is found in the oven cavity or behind the control panel.
- Oven control board replacement is required.
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
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