i get an f1 error code on my kitchenaid range display and then it seems to lock up or not respond.

Diagnosis

This F1 error code on the KitchenAid KFEG500ESS indicates a "Temperature Sensor Open" or "Short" condition. The Electronic Range Control (ERC) board is monitoring the resistance of the oven temperature sensor (RTD); when it detects a resistance value that falls outside the calibrated range—typically meaning the circuit is broken (open) or there is a direct short—it triggers the F1 code and enters a "lock-down" mode to prevent the heating elements from running uncontrollably and causing a fire. The root cause is almost always a failed thermistor inside the sensor probe. Over time, the internal wiring of the probe degrades due to extreme thermal cycling, or the probe itself physically warps, causing an internal break. In some cases, the wiring harness between the sensor and the main control board has been pinched or frayed. You can confirm this by using a multimeter to check the ohms of the sensor; at room temperature (approx. 70°F), a healthy sensor should read roughly 1080 to 1100 ohms. If you see "OL" (Open Loop) or 0 ohms, the sensor is dead.

How to Fix It

To resolve the F1 error, you must replace the oven temperature sensor assembly. Follow these precise steps:

1. Disconnect the range from the 240V power source by unplugging it or flipping the dedicated circuit breaker. Do not attempt this while the unit is energized.
2. Open the oven door and locate the temperature sensor. It is the thin, stainless steel rod protruding from the upper-back wall of the oven cavity.
3. Using a 1/4" nut driver or a small socket wrench, remove the single screw securing the sensor bracket to the oven wall.
4. Carefully pull the sensor probe forward and out of the oven cavity. Do not force it; if it feels stuck, check for any food debris or grease buildup around the mounting bracket.
5. Follow the wires from the sensor back to the rear of the chassis. Locate the wire harness connector. Press the locking tab and pull the connector apart to disconnect the sensor from the main wiring loom.
6. Install the replacement sensor (Part #WPW10190728 or equivalent). Route the wires through the existing cable guides to ensure they do not touch the oven walls or heating elements.
7. Secure the sensor probe back into the rear wall using the mounting screw. Ensure the probe is centered and not touching the oven wall, as this will cause inaccurate temperature readings.
8. Reconnect the wiring harness until you hear a distinct click.
9. Restore power to the range. The F1 code should clear automatically upon reboot. If it persists, power cycle the unit one more time by flipping the breaker off for 30 seconds and then back on.

If That Didn't Work

• Test the Wiring Harness: If a new sensor doesn't clear the code, use a multimeter to test for continuity between the sensor connector and the ERC board. A break in the wire harness (often caused by rodent damage or rubbing against the chassis) will mimic a failed sensor.
• Inspect the ERC Board: Check the Electronic Range Control board for "burnt" spots or swollen capacitors. If the sensor is functioning but the board's sensing circuit has failed, the board will continue to throw an F1 code. Look for discoloration around the sensor input pins.
• Check for a "Stuck" Relay: If the range is not responding to buttons after the sensor is replaced, the control board may be locked in a safety state. Perform a hard reset by disconnecting the power for a full 10 minutes to drain the capacitors on the control board.
• Verify Voltage: Use a multimeter to ensure the range is receiving a steady 240V. Low voltage or a "dropped leg" from the circuit breaker can cause the control board to behave erratically and trigger false sensor errors.

Heads Up

• Avoid Bending the Probe: When installing the new sensor, do not bend the metal probe to fit it into the hole. Bending the probe can damage the internal thermistor and lead to premature failure or inaccurate temperature readings.
• Avoid Chemical Cleaners: Never spray oven cleaner directly onto the temperature sensor probe. The chemicals can corrode the stainless steel casing and seep into the sensor, causing a short circuit.
• Verify Calibration: After replacement, bake a test cake or use an independent oven thermometer to ensure the oven is heating to the set temperature. If the oven overshoots or undershoots by more than 25 degrees, the sensor may be defective out of the box.
• Cable Routing: Ensure the sensor wires are tucked securely into the rear of the unit. If the wires sag, they can touch the bake element and melt, creating a dangerous short circuit.