LG · Range / Oven error code

4 (cooktop)Object/water on touch pads

Single source Power off, standard tools

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Related diagnostic guides

Guide · Range / Oven

Glass cooktop element stays on high / won't turn off

On knob-controlled cooktops this is almost always an infinite switch with welded contacts. On touch-control cooktops a relay on the control or relay board can stick closed. Note that radiant elements normally cycle on and off at lower settings; that cycling is not a fault.

4 steps ~40 minmoderate

Guide · Range / Oven

Control panel beeping, phantom key presses or F-codes

Most keypad faults come from moisture or grease behind the touch overlay, or a worn membrane, often after self-clean or a boilover. Isolate the keypad from the control by unplugging its ribbon before buying a board.

3 steps ~30 minmoderate

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1 / 2 / 3 (cooktop)

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6 (cooktop)

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CF1-CF4

Top zone sensor open/short

Cross-checked High-voltage / caution

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CF5 / CF6

IGBT sensor

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CF7 / CF8

Module communication

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CFA

Over-current (or communication)

Single source High-voltage / caution