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Error code reference

KitchenAid Oven Error Code F56

Board NTC open or shorted

KitchenAid codesKitchenAid oven codes

Board NTC open or shorted – board temperature is out of range (-10°C to 87°C) for at least 1 second.

First step from the service manual

Failure is cleared when temperature lower than 82°C is detected for at least 1 second. Switch OFF all loads except IPC power relay.

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

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What F56 means on a KitchenAid oven

The F56 error code on a KitchenAid oven indicates that the NTC (negative temperature coefficient) thermistor mounted on the control board has detected a temperature reading that is either outside the acceptable operating range of -10°C to 87°C, or the sensor itself has failed in an open or shorted condition. This on-board NTC is distinct from the oven cavity temperature sensor and is specifically responsible for monitoring the ambient temperature of the control board itself. The fault is triggered when the out-of-range condition persists for at least one second, at which point the system logs the error and takes protective action.

When F56 is active, the control board switches off all electrical loads except the IPC (Inverter Power Control) power relay. This is a thermal protection response designed to reduce heat generation inside the control enclosure and allow the board temperature to drop. The fault clears automatically once the board-mounted NTC detects a temperature below 82°C for a sustained period of at least one second. If the board repeatedly overheats, the underlying cause must be addressed before the oven will resume normal operation.

Common contributors to this fault include blocked ventilation around the control board, a failed cooling fan, a defective or degraded NTC thermistor on the board itself, or an actual electrical fault causing localized heat buildup on the board. A shorted NTC will report an artificially low or erratic resistance value, while an open NTC will cause the circuit to read no resistance at all, both of which push the temperature reading outside acceptable limits and trigger F56.

Source: manufacturer service documentation.

Common causes of F56

  1. 01

    Control board overheating due to poor ventilation

    Wiring / connection

    If the oven's control enclosure is blocked or the surrounding area restricts airflow, heat can build up around the board and push the NTC reading above 87°C. Check that ventilation openings around the control panel are clear and unobstructed.

  2. 02

    Failed or degraded board-mounted NTC thermistor

    Part replacement

    The NTC thermistor on the control board can fail in either an open or shorted state, causing the board to report a temperature reading that is out of range even when actual board temperature is normal. A shorted NTC produces very low resistance; an open NTC produces no continuity at all.

  3. 03

    Cooling fan failure

    Part replacement

    Many KitchenAid oven control assemblies rely on a cooling fan to manage board temperature during operation. If the fan motor has seized or its wiring has failed, the board can overheat rapidly, triggering F56 during normal use.

  4. 04

    Faulty control board with internal heat-generating fault

    Part replacement

    A component on the control board itself, such as a failing relay or shorted trace, can generate excess heat localized to the board, causing the NTC to read a legitimate high temperature. Visible burn marks, discoloration, or a burnt smell are indicators of this condition.

  5. 05

    Loose or corroded NTC wiring connections

    Wiring / connection

    Wiring connections between the NTC thermistor and the board's sensing circuit can corrode or loosen over time, causing intermittent open-circuit readings that mimic a failed sensor. Inspect the connector pins for corrosion, looseness, or heat damage.

See the test procedure for each cause

Frequently asked questions about F56

What does F56 mean on a KitchenAid oven?
F56 indicates that the NTC thermistor mounted on the control board has detected a temperature outside the acceptable range of -10°C to 87°C, or has failed in an open or shorted condition. The oven responds by shutting off most electrical loads to protect the board. The fault must persist for at least one second before it is logged. It clears automatically when the board temperature drops below 82°C for at least one second.
Will resetting the oven clear the F56 error code?
The F56 fault is designed to clear on its own once the control board temperature drops below 82°C for at least one second, without requiring a manual reset. However, simply power-cycling the oven may temporarily clear the display while the underlying cause remains. If the code returns during normal use, the root cause such as a failed NTC, blocked ventilation, or a faulty cooling fan needs to be diagnosed and corrected.
Is it safe to use my KitchenAid oven when F56 is showing?
When F56 is active, the oven has already taken protective action by switching off most loads, so continuing to attempt operation is not recommended. Running the oven repeatedly through F56 fault cycles without addressing the cause risks damaging the control board further. It is best to stop using the oven until the fault has been properly diagnosed.
How do I fix the F56 error on a KitchenAid oven?
Start by confirming the control board area has adequate ventilation and that no airflow is blocked. Next, check that any cooling fan associated with the control enclosure is operating correctly. If ventilation is not the issue, the board-mounted NTC thermistor should be tested for proper resistance values, and all associated wiring connections should be inspected for corrosion or looseness. If the thermistor or the control board itself has failed, replacement of the affected component will be necessary.
How much does it cost to repair a KitchenAid oven showing F56?
Repair costs depend on the root cause. If the fix is limited to cleaning ventilation paths or reseating a connector, out-of-pocket costs may be minimal. Replacing a cooling fan typically runs in the range of $50 to $150 for parts and labor. If the control board itself needs replacement, costs can range from $200 to $500 or more depending on the specific model and whether professional installation is needed.

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