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Error code reference

KitchenAid Oven Error Code F59

Coil 1/2 NTC open

KitchenAid codesKitchenAid oven codes

Coil 1/2 NTC open – coil NTC reads under 16°C for at least 30 seconds.

First step from the service manual

Failure is cleared when temperature greater than 16°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 F59 means on a KitchenAid oven

The F59 error code on a KitchenAid oven indicates that the Coil 1/2 NTC (Negative Temperature Coefficient thermistor) is reading an open circuit condition. Specifically, the control detects a temperature reading below 16°C from the coil NTC sensor for a continuous period of at least 30 seconds. The NTC thermistor is a temperature-sensing resistor whose resistance decreases as temperature rises. When the sensor reads below the 16°C threshold for the defined duration, the control interprets this as an open or failed sensor circuit rather than a genuine ambient or component temperature.

This fault is associated with the induction coil monitoring system. The IPC (Induction Power Control) power relay remains active during diagnosis, while all other loads are switched off as part of the initial diagnostic step. The NTC sensor in this context monitors coil temperature to protect the induction components from overheating and to verify proper thermal conditions before and during operation. An open NTC circuit means the control cannot confirm safe operating temperatures.

The fault clears automatically when the NTC sensor reads above 16°C for at least 1 continuous second, which indicates the sensor circuit has restored continuity and is providing valid readings. Common root causes include a broken or disconnected sensor wire, a failed thermistor with an open internal element, or a poor connector contact between the NTC harness and the control board. Cold ambient conditions alone are unlikely to trigger this fault under normal circumstances, making a component or wiring failure the more probable explanation.

Source: manufacturer service documentation.

Common causes of F59

  1. 01

    Failed or open NTC thermistor

    Part replacement

    The NTC thermistor itself can develop an open internal element, causing it to stop sending any valid resistance signal to the control board. Measure the thermistor resistance and compare it against expected values for the ambient temperature. A reading of infinite resistance confirms an open thermistor.

  2. 02

    Broken or damaged wiring harness

    Part replacement

    A wire in the harness connecting the coil NTC sensor to the control board can break, fray, or develop an open circuit due to heat exposure or physical damage. Inspect the full length of the harness for visible damage and use a multimeter to check for continuity.

  3. 03

    Loose or corroded connector

    Wiring / connection

    The connector between the NTC sensor harness and the IPC control board can work loose or develop corrosion that interrupts the signal. Disconnect and reseat the connector, inspecting the terminals for oxidation or bent pins.

  4. 04

    Faulty IPC control board

    Part replacement

    If the wiring and thermistor both test correctly, the IPC board's input circuit for the NTC signal may have failed, causing it to misread or not detect the sensor at all. This is typically diagnosed after all other components have been ruled out.

  5. 05

    Extremely low ambient temperature during startup

    Wiring / connection

    In rare cases, if the oven is in an environment where the coil area is genuinely below 16°C and the sensor is functioning correctly, the fault may appear at startup. This is uncommon in normal household conditions but worth considering in unusual installation environments.

See the test procedure for each cause

Frequently asked questions about F59

What does F59 mean on a KitchenAid oven?
F59 means the control board detected that the Coil 1/2 NTC temperature sensor was reading below 16°C for at least 30 consecutive seconds. The NTC is a thermistor that monitors induction coil temperature, and when its signal falls out of the valid range for that duration, the oven logs this fault. It typically points to a failed sensor, open wiring, or a loose connector in the NTC circuit.
Can I fix the F59 error code myself?
Checking and reseating the NTC sensor connector is something a confident DIYer can attempt after disconnecting power to the oven. Testing the thermistor with a multimeter for continuity and inspecting the wiring harness for visible damage are also reasonable DIY steps. However, if the fault points to the IPC control board or requires disassembling the cooktop to access the coil assembly, professional service is recommended.
Will resetting the oven clear the F59 code?
The F59 code clears automatically when the NTC sensor reads a temperature above 16°C for at least 1 continuous second, not simply from a power reset. If the underlying problem is a failed thermistor or broken wire, cycling the power will not permanently resolve the fault. The error will return as soon as the oven attempts to operate and re-detects the invalid sensor signal.
Is it safe to use my KitchenAid oven while F59 is displayed?
Using the oven with an active F59 fault is not recommended. The NTC sensor is part of the thermal protection system for the induction coils, and operating without a valid temperature reading means the control cannot confirm safe coil conditions. Continued use could risk damage to the induction components or create an unsafe operating condition.
How much does it cost to repair an F59 error on a KitchenAid oven?
Repair costs vary depending on the failed component. A replacement NTC thermistor typically costs in the range of $15 to $50 for the part alone. If the IPC control board is at fault, parts can range from $100 to $300 or more depending on the model. Adding professional labor, total repair costs generally fall between $100 and $400, though complex diagnostics or difficult access can push costs higher.

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