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Error code reference

LG Range Error Code F16

Lower oven overheating

LG codesLG range codes

Lower oven overheating — oven temperature is over 650°F continuously for 2 minutes during cooking (except self-cleaning).

First step from the service manual

Check oven sensor resistance at pins 5 and 6 of CN61; normal is approximately 1.09 kΩ at 75°F.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What F16 means on a LG range

The F16 error code on an LG range indicates that the lower oven has exceeded 650°F continuously for two minutes during a standard cooking cycle. This is not a self-clean condition, where high temperatures are expected and managed by separate logic. Instead, F16 fires during normal bake or broil operation, signaling that the oven's thermal monitoring system has detected a runaway temperature condition that falls outside safe operating parameters.

The oven temperature sensor (RTD sensor) is central to this fault. It monitors cavity temperature and sends resistance-based readings to the control board throughout operation. At approximately 75°F, a properly functioning sensor reads around 1.09 kΩ at connector CN61, pins 5 and 6. If the sensor has drifted out of calibration, shorted, or developed an open circuit, the control board may receive inaccurate readings, either failing to detect overheating or misreading temperature entirely. A faulty bake or broil element that does not cycle off properly, or a relay on the control board that has stuck in a closed position, can also cause actual uncontrolled heating that triggers this code.

Diagnosis should begin at CN61 by measuring sensor resistance across pins 5 and 6 with the oven at room temperature. A reading far from 1.09 kΩ points to a failed sensor. If the sensor reads correctly, the investigation shifts to the control board relay responsible for element switching and to the heating elements themselves for signs of physical damage or shorting.

Source: manufacturer service documentation.

Common causes of F16

  1. 01

    Faulty oven temperature sensor

    Part replacement

    A drifted, shorted, or open RTD sensor sends incorrect temperature data to the control board. Measure resistance at CN61 pins 5 and 6 at room temperature, a reading significantly different from 1.09 kΩ confirms a failed sensor.

  2. 02

    Stuck relay on the control board

    Part replacement

    If the relay that switches the bake or broil element stays closed, the element heats without interruption and the oven temperature climbs uncontrollably. The control board would need to be inspected and replaced if a welded or stuck relay is confirmed.

  3. 03

    Bake or broil element shorting internally

    Part replacement

    An element that has developed an internal short can draw continuous power even when the control board attempts to cycle it off, causing sustained overheating. Inspect elements visually for burn marks, blistering, or breaks and test for continuity.

  4. 04

    Wiring harness damage or loose connection at CN61

    Wiring / connection

    Damaged, pinched, or corroded wiring between the temperature sensor and the control board connector CN61 can cause erratic resistance readings that trigger a false overheating fault. Inspect the harness for heat damage and verify the connector is fully seated.

  5. 05

    Control board failure

    Part replacement

    If the sensor, elements, and wiring all test correctly, the control board itself may be misinterpreting temperature data or failing to regulate element cycling. Board replacement is typically required after all other components are ruled out.

See the test procedure for each cause

Frequently asked questions about F16

What does F16 mean on a LG range?
F16 indicates that the lower oven temperature exceeded 650°F continuously for two minutes during a standard cooking cycle, not during self-cleaning. LG's control system interprets this as an overheating fault and shuts down operation as a safety measure. The most common causes include a failed oven temperature sensor, a stuck relay on the control board, or a heating element that is not cycling off properly.
Is it safe to use my LG range when F16 is displayed?
No, you should not continue using the oven while F16 is active. The code indicates an uncontrolled overheating condition, and operating the oven in this state risks damage to internal components and poses a potential fire hazard. Disconnect power to the range until the fault has been properly diagnosed and repaired.
Will resetting my LG range clear the F16 error code?
Disconnecting power for a few minutes may temporarily clear the F16 code, but it will return if the underlying cause has not been fixed. Because F16 is triggered by a sustained thermal condition, simply resetting the appliance does not address a faulty sensor, stuck relay, or failing element. A proper diagnosis is needed before the range can be safely used again.
How do I fix the F16 error on my LG range?
Start by measuring the oven temperature sensor resistance at connector CN61, pins 5 and 6, with the oven at room temperature. A properly functioning sensor reads approximately 1.09 kΩ at 75°F. If the reading is off, replace the sensor. If the sensor checks out, inspect the bake and broil elements for damage and test the control board relay for proper switching operation. A relay stuck in the closed position or a damaged element will require part replacement.
How much does it cost to repair an LG range showing F16?
Repair costs vary depending on the failed component. An oven temperature sensor is generally the least expensive fix, with parts typically ranging from $20 to $60 plus labor. Control board replacement is the most costly scenario, with parts often ranging from $150 to $350 or more depending on the model. If you hire a technician, expect an additional service call and labor fee on top of part costs.

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