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Error code reference

LG Range Error Code F3

Key short error

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What the F3 error code actually means

The F3 error means your LG range has detected a problem with its control panel touch buttons, either because multiple buttons appear to be stuck or shorted, or because the panel has stopped communicating with the main control board entirely. This is not a normal operating condition and the range may not respond correctly to inputs while this error is active. The issue is typically in the wiring or the touch panel hardware and will need inspection or repair to resolve.

Diagnostic procedure

The full F3 procedure

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MyPros+ · DiagnosticsStep 1 preview
1
First diagnostic step
Check wiring and Touch PCB; check connecting states between keypad and CN03 of Main PCB.
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Most common causes of F3

Ranked by how often they cause this code
  1. 1Loose or damaged connector at CN03
  2. 2Liquid intrusion under the keypad
  3. 3Failed or damaged Touch PCB
  4. 4Damaged wiring harness between keypad and Touch PCB
  5. 5Failed main PCB

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Questions people ask about F3

What does F3 mean on a LG range?
F3 on an LG range indicates a key short error in the touch control system. It is triggered when 25 key short events occur 3 times within 90 seconds, or when communication between the Touch IC and the main PCB is lost for more than 60 seconds. The fault points to the keypad, Touch PCB, or the wiring and connectors linking those components to connector CN03 on the main control board.
Is it safe to use my LG range while the F3 error is displayed?
It is not recommended to operate the range while F3 is active. The error indicates that the touch control system is malfunctioning, which means keypad inputs may not be processed correctly or reliably. This could result in unintended behavior from the control system, so the range should be powered off and inspected before further use.
How much does it cost to repair an F3 error on an LG range?
Repair costs vary depending on the root cause. If only a connector needs reseating or a wiring harness needs replacement, costs are generally in the range of $50 to $150 for parts and labor. If the Touch PCB requires replacement, expect costs in the $100 to $250 range. Main PCB replacement is the most expensive scenario, typically running $200 to $450 or more depending on labor rates and part availability.
Can I fix the F3 error on my LG range myself?
Some causes of F3 are DIY-friendly, such as reseating a loose connector at CN03 or cleaning moisture from the keypad area. However, if the Touch PCB or main PCB needs replacement, the repair requires disassembling the control panel and working near high-voltage components, which is best handled by a qualified technician. Always disconnect power to the range before inspecting any internal wiring or connectors.
Will resetting my LG range clear the F3 error?
Disconnecting the range from power for a few minutes and then restoring power may temporarily clear the F3 code if the fault was caused by a transient signal issue. However, if the underlying cause is a hardware problem such as a damaged connector, failed Touch PCB, or wiring fault, the error will return. A reset is a useful first step but is not a substitute for proper diagnosis and repair.

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