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Error code reference

KitchenAid Range Error Code F4E2

Over temperature during cook mode (temperature runaway error).

KitchenAid codesKitchenAid range codes

Over temperature during cook mode (temperature runaway error).

First step from the service manual

Enter diagnostics mode and press BAKE key to cycle bake relay on and off; verify relay and gas valve operation.

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

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What F4E2 means on a KitchenAid range

The F4E2 error code on a KitchenAid range indicates an over-temperature condition during cook mode, commonly referred to as a temperature runaway error. This fault occurs when the oven temperature rises beyond the expected range without the control board being able to regulate it properly. The control system continuously monitors oven temperature through a sensor circuit, and when the actual temperature climbs significantly above the setpoint without correction, the board interprets this as a runaway condition and shuts down operation to prevent damage or a safety hazard.

The bake relay and gas valve are central to this diagnostic. In normal operation, the control board cycles the bake relay on and off to control gas valve activation, which in turn regulates burner output. If the relay becomes stuck in the closed position, the gas valve stays open and the burner continues to fire without interruption, causing uncontrolled temperature rise. A faulty gas valve that does not close when commanded can produce the same result.

The oven temperature sensor itself is also a factor. If the sensor is reading lower than the actual oven temperature, the control board will continue calling for heat because it believes the oven has not reached setpoint, even as the cavity overheats. Entering diagnostics mode and pressing the BAKE key to cycle the bake relay is the recommended first step, allowing a technician to observe whether the relay responds to commands and whether the gas valve opens and closes as expected.

Source: manufacturer service documentation.

Common causes of F4E2

  1. 01

    Bake relay stuck closed

    Part replacement

    A relay that is welded or stuck in the closed position will continuously power the gas valve, preventing the burner from cycling off. During diagnostics, pressing the BAKE key should toggle the relay; if the relay does not release, it needs replacement.

  2. 02

    Faulty gas valve not closing

    Part replacement

    Even when the relay opens, a gas valve that fails to close mechanically will keep the burner firing. Verify that the gas valve de-energizes and fully closes when the bake relay is cycled off during the diagnostics test.

  3. 03

    Oven temperature sensor reading low

    Part replacement

    If the temperature sensor reports a lower temperature than what is actually present in the oven cavity, the control board will keep calling for heat unnecessarily. Check the sensor's resistance value against the specification for the oven's current temperature to confirm accuracy.

  4. 04

    Control board failure

    Part replacement

    The control board may be unable to properly open the bake relay circuit even when it receives the correct signal to do so. If the relay and gas valve both test correctly but the error persists, the control board is likely the source of the fault.

  5. 05

    Loose or damaged wiring in the bake circuit

    Wiring / connection

    Corroded, shorted, or loose connections between the control board, relay, and gas valve can cause erratic relay behavior that leads to uncontrolled heating. Inspect the wiring harness for heat damage, pinched wires, or poor terminal contact.

See the test procedure for each cause

Frequently asked questions about F4E2

What does F4E2 mean on a KitchenAid range?
F4E2 indicates an over-temperature condition during cook mode, meaning the oven temperature climbed beyond the acceptable range without the control system being able to regulate it. This is commonly called a temperature runaway error. The range shuts down automatically when this occurs to prevent damage or a safety hazard. The bake relay, gas valve, and oven temperature sensor are the primary components involved.
Is it safe to use my KitchenAid range while the F4E2 code is active?
No, you should not use the oven while F4E2 is active. The error indicates the oven was unable to control its own temperature, which means the burner may have continued firing without stopping. Operating the oven in this condition poses a risk of extreme overheating. Have the bake relay, gas valve, and temperature sensor inspected before using the range again.
Will resetting the KitchenAid range clear the F4E2 error?
Resetting the range by disconnecting power may temporarily clear the code, but if the underlying fault remains, the error will return as soon as the oven reaches the overtemperature condition again. A reset does not fix the root cause. Proper diagnosis of the bake relay, gas valve, and temperature sensor is necessary to resolve the fault permanently.
How do I diagnose and fix the F4E2 error on a KitchenAid range?
Begin by entering the range's diagnostics mode and pressing the BAKE key to cycle the bake relay on and off. Observe whether the relay responds correctly and whether the gas valve opens and closes with each cycle. If the relay is stuck or the gas valve does not respond, those components should be replaced. Also test the oven temperature sensor's resistance to confirm it is reading accurately.
How much does it cost to repair an F4E2 error on a KitchenAid range?
Repair costs vary depending on the faulty component. A bake relay or oven temperature sensor replacement typically runs in the range of $100 to $250 including parts and labor. A gas valve replacement can cost between $150 and $350 or more depending on the part. Control board replacement is usually the most expensive option, often ranging from $250 to $500 or higher. Getting a diagnosis before ordering parts helps avoid unnecessary costs.

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