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Error code reference

KitchenAid Microwave Error Code F3-E0

Temperature sensor (lower) opened.

KitchenAid codesKitchenAid microwave codes

Temperature sensor (lower) opened.

First step from the service manual

Disconnect power or unplug oven, check lower cavity sensor connection, measure sensor resistance (1080 ohms at 70°F).

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

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What F3-E0 means on a KitchenAid microwave

The F3-E0 error code indicates the control board has detected an open circuit in the temperature sensor circuit. Specifically, the sensor's resistance has fallen outside the valid range expected for normal operation, which the control interprets as the sensor circuit being broken or disconnected. The temperature sensor in this KitchenAid microwave monitors cavity or component temperature to prevent overheating and regulate cooking performance. An open sensor means the control has lost its ability to read temperature data and has shut down operation as a safety precaution.

For homeowners, this means your microwave has detected a problem with the part that monitors internal temperature. The sensor works by sending a resistance signal back to the control board. At 70°F, a healthy sensor reads approximately 1080 ohms, increasing by about 2 ohms per degree. When the board receives no valid signal at all, it flags F3-E0 and stops the microwave from running. This is a protective response, not a random glitch.

The root cause could be a failed sensor, a loose or corroded wiring connection between the sensor and the control board, or in less common cases, a welded relay on the control board itself that is interfering with the sensor circuit signal.

Source: manufacturer service documentation.

Common causes of F3-E0

  1. 01

    Failed temperature sensor (open circuit)

    Part replacement

    The temperature sensor itself has failed internally, breaking the circuit and producing no valid resistance reading. This is the most common cause of F3-E0 and is confirmed by measuring resistance across the sensor terminals and finding an open or out-of-range reading.

  2. 02

    Loose or disconnected sensor wiring harness

    Wiring / connection

    The connector between the temperature sensor and the control board has come loose, corroded, or broken, interrupting the resistance signal. Inspecting and reseating the connector may resolve the error without replacing any parts.

  3. 03

    Damaged wiring between sensor and control board

    Part replacement

    A wire in the sensor circuit has been pinched, burned, or broken, creating an open circuit even if the sensor itself tests correctly. Visual inspection of the harness routing and continuity testing of each wire will identify this cause.

  4. 04

    Welded-closed relay on the control board

    Part replacement

    If the sensor and all wiring test within spec, a relay on the control board that has welded shut can interfere with the sensor circuit and produce a false F3-E0 code. This requires control board replacement and is the least common cause.

See the test procedure for each cause

Frequently asked questions about F3-E0

What does F3-E0 mean on a KitchenAid microwave?
F3-E0 means the control board has detected an open circuit in the temperature sensor. The sensor communicates with the board through a resistance signal, and when the board receives no valid reading, it triggers this code and stops the microwave from operating. The sensor should read approximately 1080 ohms at 70°F, increasing by 2 ohms per degree Fahrenheit.
How do I fix F3-E0 on a KitchenAid microwave?
Start by unplugging the microwave and checking the wiring connector at the temperature sensor. Reconnect or reseat it if it is loose. Next, measure the sensor's resistance with a multimeter: a good sensor reads around 1080 ohms at 70°F. If the reading is open or clearly out of range, replace the temperature sensor. If both the sensor and connections check out, the control board may have a welded relay and will need to be replaced.
Is it safe to use my KitchenAid microwave while F3-E0 is displayed?
No. The F3-E0 code indicates the microwave has lost its ability to monitor internal temperature. Running the appliance without a functioning temperature sensor removes a key safety protection against overheating. The microwave will typically refuse to operate while this code is active, and you should not attempt to bypass it. Resolve the sensor or wiring issue before using the microwave again.
How much does it cost to fix a KitchenAid microwave F3-E0 error?
If only the temperature sensor needs replacement, the part typically costs between $20 and $60 depending on the model, and it is a manageable DIY repair for someone comfortable with appliance disassembly and a multimeter. If the control board has a welded relay and needs replacement, the part alone can range from $80 to $200 or more, making professional diagnosis worthwhile before purchasing the board.
How do I test the temperature sensor on a KitchenAid microwave showing F3-E0?
Unplug the microwave, locate the temperature sensor, and disconnect its wiring connector. Set a multimeter to measure resistance (ohms) and place the probes across the sensor terminals. At room temperature around 70°F, a good sensor reads approximately 1080 ohms. For every degree above 70°F, expect the reading to increase by about 2 ohms. A reading of infinite resistance (open line) or one far outside this range confirms the sensor has failed and needs replacement.

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