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Error code reference

LG Cooktop Error Code F

Unsuitable cookware detected or cookware not placed correctly on the cooking zone; the affected cooking zone…

LG codesLG cooktop codes

Unsuitable cookware detected or cookware not placed correctly on the cooking zone; the affected cooking zone will not heat.

First step from the service manual

Verify correct cookware material (magnetic) and proper placement/centering on the cooking zone.

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

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What F means on a LG cooktop

The F error code on an LG induction cooktop indicates that the cooking zone's sensor system has failed to detect compatible cookware, or has detected that the cookware is not correctly positioned over the induction coil. Induction cooktops work by generating an alternating electromagnetic field through a copper coil beneath the glass surface. This field induces eddy currents in ferromagnetic cookware, which produce heat. When the control system cannot confirm adequate electromagnetic coupling between the coil and the cookware, it triggers the F code and shuts down heating for that zone as a protective measure.

The detection process relies on the cooktop's inverter circuit continuously monitoring the load characteristics of whatever is placed on the cooking zone. If the pan is too small for the zone, made from a non-magnetic material such as aluminum, copper, or glass, or is positioned off-center so that insufficient surface area covers the coil, the inverter reads an unsuitable load and registers the fault. The affected zone will not energize until the condition is corrected.

In most cases the F code is not a component failure but a user-correctable condition. However, if the fault appears with confirmed compatible cookware that is properly centered, the issue may point to a fault in the pan detection circuitry, the induction coil itself, or the control board managing that zone. Persistent F codes with correct cookware warrant a deeper electrical inspection.

Source: manufacturer service documentation.

Common causes of F

  1. 01

    Non-magnetic cookware material

    Wiring / connection

    Pots and pans made from aluminum, copper, glass, or non-magnetic stainless steel will not couple with the induction coil. A quick test is to hold a magnet to the bottom of the pan; if it does not stick firmly, the cookware is incompatible.

  2. 02

    Cookware not centered on the cooking zone

    Wiring / connection

    If the pan is shifted to one side so that its base does not adequately cover the induction coil, the sensor will not detect a sufficient load and will trigger F. Reposition the pan so it sits squarely over the zone markings on the glass.

  3. 03

    Cookware base too small for the selected zone

    Wiring / connection

    A pan whose base diameter is significantly smaller than the cooking zone may not provide enough ferromagnetic surface area for reliable detection. Selecting a smaller cooking zone that better matches the pan size often resolves this.

  4. 04

    Warped or uneven pan bottom

    Wiring / connection

    A pan with a heavily warped base makes poor contact with the glass surface, reducing the effective coupling area seen by the coil. The inconsistent contact can cause the sensor to read an unsuitable load even with otherwise compatible cookware.

  5. 05

    Faulty pan detection circuit or control board

    Part replacement

    If the F code appears consistently with confirmed compatible, properly sized, and correctly centered cookware, the inverter circuit or control board managing that zone may have a component-level fault. This scenario requires professional diagnosis and possible board replacement.

See the test procedure for each cause

Frequently asked questions about F

What does F mean on a LG cooktop?
The F code means the cooktop's induction zone has detected unsuitable cookware or has determined that the cookware is not placed correctly over the coil. The affected zone will not heat until the condition is resolved. This is most often a cookware compatibility or placement issue rather than a hardware failure.
How do I fix the F error on my LG induction cooktop?
Start by confirming your cookware is magnetic by testing it with a refrigerator magnet pressed to the base. If the magnet sticks firmly, the material is compatible. Next, center the pan squarely over the cooking zone markings and make sure the pan base is large enough to cover the zone. If the error clears, no further action is needed. If it persists with confirmed compatible cookware, a technician should inspect the detection circuitry.
Will resetting my LG cooktop clear the F error code?
Powering the cooktop off at the circuit breaker for about 30 seconds and then restoring power can clear the displayed code, but the F error will return immediately if the underlying cause has not been corrected. The cooktop will continue to block heating on that zone until compatible, properly centered cookware is detected. Address the cookware issue first before attempting a reset.
Is it safe to keep using my LG cooktop when the F code appears?
The F code is a protective response, not a hazard warning. The affected cooking zone is simply disabled and will not generate heat until the condition is corrected. Other zones on the cooktop are unaffected and can be used normally. There is no safety risk associated with the F code itself.
How much does it cost to repair an LG cooktop showing the F error?
In most cases the F code costs nothing to resolve because it requires only a change in cookware or adjustment of pan placement. If a hardware fault such as a failed control board is responsible for a persistent F code, repair costs typically range from around 150 dollars to over 400 dollars depending on the specific board, labor rates in your area, and whether the unit is still under warranty.

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