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Error code reference

LG Cooktop Error Code FA

Rear right no feedback (no signal feedback from rear right cooking zone).

LG codesLG cooktop codes

Rear right no feedback (no signal feedback from rear right cooking zone).

First step from the service manual

Check connector CN01 on the rear IH module.

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

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What FA means on a LG cooktop

The FA error code on an LG induction cooktop indicates that the rear right cooking zone is not receiving a signal feedback from its corresponding induction heating (IH) module. In induction cooktops, each cooking zone is managed by a dedicated IH module that continuously communicates operational status back to the main control board. When that feedback signal is interrupted or absent, the control board cannot confirm whether the zone is functioning correctly, and it triggers the FA code to protect the unit and alert the user.

The rear right IH module communicates with the main control board through a connector designated CN01. This connector carries the feedback signal, and any failure at this connection point is the primary suspect when FA appears. Causes range from a loose or unseated CN01 connector to damaged wiring in the harness running between the IH module and the main board. Corrosion, heat stress, or physical damage to the connector pins can all interrupt the signal path without fully severing the wiring.

If the CN01 connector checks out and the wiring harness appears intact, the fault likely lies within the rear right IH module itself. Internal component failure within the module, such as a failed driver circuit or a damaged feedback output stage, can prevent any signal from being generated in the first place. In some cases, the main control board may also be unable to interpret the signal correctly, though the IH module is statistically the more common point of failure when wiring and connectors are confirmed good.

Source: manufacturer service documentation.

Common causes of FA

  1. 01

    Loose or disconnected CN01 connector

    Wiring / connection

    The CN01 connector on the rear IH module is the first place to check. Vibration or improper reassembly can cause this connector to work loose, breaking the feedback signal path entirely.

  2. 02

    Damaged or corroded connector pins

    Wiring / connection

    Even if CN01 appears seated, individual pins may be bent, corroded, or burned, preventing a reliable electrical connection. Inspect each pin carefully for discoloration, pitting, or physical deformation.

  3. 03

    Wiring harness damage

    Part replacement

    The wiring harness running between the rear IH module and the main control board may have chafed insulation, a broken conductor, or heat damage that interrupts the feedback signal. A visual inspection and continuity test of the harness will confirm this.

  4. 04

    Failed rear right IH module

    Part replacement

    If the connector and wiring are in good condition, the rear right IH module itself may have an internal failure preventing it from generating any feedback signal. Replacing the module is required to resolve this.

  5. 05

    Faulty main control board

    Part replacement

    In less common cases, the main control board may have lost the ability to receive or interpret the feedback signal from the rear right zone even when the module and wiring are functioning. This is typically diagnosed after all other components have been ruled out.

See the test procedure for each cause

Frequently asked questions about FA

What does FA mean on a LG cooktop?
The FA error code means the rear right cooking zone is sending no feedback signal to the main control board. LG induction cooktops rely on continuous communication between each IH module and the control board to operate safely. When that signal is absent, the board displays FA and disables the affected zone. The fault typically originates at the CN01 connector on the rear IH module or within the module itself.
Can I fix the FA error myself, or do I need a technician?
If you are comfortable working inside appliances safely, you can start by unplugging the cooktop and checking the CN01 connector on the rear IH module for loose seating, bent pins, or corrosion. Reseating or cleaning the connector is a straightforward step that sometimes resolves the error. However, if the fault is in the wiring harness or the IH module itself, those repairs involve higher-voltage components and are better handled by a qualified technician.
Is it safe to keep using the cooktop while the FA error is displayed?
The rear right cooking zone will not function while the FA code is active, so there is no heating risk from that specific zone. However, continuing to operate the cooktop with an unresolved module communication fault is not recommended, as underlying wiring or component issues could affect other zones or worsen over time. It is best to address the fault before resuming regular use.
Will resetting the cooktop clear the FA error code?
A power reset by unplugging the cooktop for a few minutes may temporarily clear the FA code, but it will return if the underlying cause has not been resolved. The error is not a soft fault triggered by a momentary glitch. It indicates a genuine absence of signal feedback from the rear right zone, so the root cause must be corrected for the code to stay cleared.
How much does it typically cost to repair an FA error on an LG cooktop?
Repair costs depend on which component has failed. If the fix is simply reseating the CN01 connector, the cost may be limited to a service call fee, typically in the range of $75 to $150. If the rear right IH module needs replacement, parts and labor combined can range from $200 to $450 or more depending on the specific model and your location. Main control board replacement is generally the most expensive scenario, often ranging from $300 to $600 or higher.

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