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Error code reference

KitchenAid Cooktop Error Code FOP

No communications between the right and left electronic boards.

KitchenAid codesKitchenAid cooktop codes

No communications between the right and left electronic boards.

First step from the service manual

Unplug cooktop or disconnect power, then check the electronic board connections (CNT7-CNT6) and the relay board connection.

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

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What FOP means on a KitchenAid cooktop

The FOP error code on a KitchenAid cooktop signals a loss of communication between the right and left electronic control boards. These two boards work in tandem to coordinate cooking zone operation, power regulation, and user input processing across the cooktop surface. When the internal communication link between them is interrupted or fails entirely, the cooktop cannot function safely and displays FOP to alert the user and technician to the fault.

The communication path between the two boards runs through specific connector points designated CNT7 and CNT6, along with a relay board connection. A break in this path can stem from a loose or improperly seated connector, a damaged wiring harness between the boards, or corrosion on the connector terminals. In some cases, the fault lies with one of the boards itself, where an internal component failure prevents it from transmitting or receiving the communication signal.

Diagnosing this code begins with a full power disconnect, either by unplugging the unit or shutting off the circuit breaker. With power removed, a technician should physically inspect and reseat the CNT7 and CNT6 connectors and verify the relay board connection is secure. If the connectors are intact and undamaged, the wiring harness between the boards should be checked for continuity and physical damage. If wiring and connections check out, one or both electronic boards may need replacement.

Source: manufacturer service documentation.

Common causes of FOP

  1. 01

    Loose or disconnected board connectors

    Wiring / connection

    The CNT7 or CNT6 connectors linking the left and right electronic boards may have worked loose due to vibration or improper reassembly. Reseating these connectors is the first and most likely fix.

  2. 02

    Damaged wiring harness

    Part replacement

    The wiring harness running between the two control boards may have a broken, pinched, or burned wire that interrupts the communication signal. Inspecting the harness for visible damage and testing continuity will confirm this cause.

  3. 03

    Faulty relay board connection

    Wiring / connection

    The relay board connection is part of the communication circuit between the two main boards. A loose or corroded relay board connector can disrupt the signal and trigger the FOP code.

  4. 04

    Failed left or right electronic control board

    Part replacement

    If connections and wiring are all intact, one of the two electronic boards may have an internal failure preventing it from sending or receiving communication signals. Board replacement would be required in this case.

  5. 05

    Corroded connector terminals

    Wiring / connection

    Moisture or grease exposure can cause corrosion on the CNT7 or CNT6 connector terminals, increasing resistance in the communication circuit to the point where the signal is lost. Cleaning or replacing the affected connector may resolve the issue.

See the test procedure for each cause

Frequently asked questions about FOP

What does FOP mean on a KitchenAid cooktop?
FOP indicates that communication between the right and left electronic control boards has been lost. These two boards must exchange signals to coordinate cooktop operation, and when that link is broken, the unit shuts down and displays the FOP code. The fault is typically found in the wiring connectors designated CNT7 and CNT6, or in the relay board connection.
Can I fix the FOP error code myself?
A homeowner comfortable working with appliances can start by disconnecting power and checking whether any internal board connectors are visibly loose. However, accessing the internal boards and connectors on a built-in cooktop typically requires removing the unit and working with low-voltage wiring. If connectors appear secure and the error persists, diagnosing a failed board or harness is best left to a qualified technician.
Will resetting the cooktop clear the FOP error?
Unplugging the cooktop or cutting power at the breaker and then restoring power may temporarily clear the FOP code if the communication failure was caused by a transient electrical glitch. However, if the underlying cause is a loose connector, damaged harness, or failed board, the error will return once the cooktop attempts to resume normal operation. A proper inspection of the board connections is necessary for a lasting fix.
Is it safe to use my KitchenAid cooktop while the FOP code is displayed?
No, you should not attempt to use the cooktop while the FOP error is active. The fault indicates that the control boards cannot communicate, which means the cooktop cannot properly regulate cooking zones or respond to user input. Disconnect power and leave the unit off until the fault has been diagnosed and repaired.
How much does it cost to repair a KitchenAid cooktop FOP error?
Repair costs vary depending on the root cause. If only a connector needs reseating or cleaning, labor costs for a service call typically range from $75 to $150. If a wiring harness requires replacement, parts and labor combined may run $100 to $250. Replacing one or both electronic control boards is the most expensive scenario, with total costs potentially ranging from $200 to $500 or more depending on parts availability and labor rates in your area.

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