Caloric Range Error Code F3

The F3 error code on a Caloric range indicates an open circuit condition in the oven temperature sensor circuit. The oven temperature sensor, also called an RTD (resistance temperature detector), is a probe mounted inside the oven cavity that continuously monitors internal temperature and sends resistance-based readings back to the electronic control board. Under normal operation, the sensor's resistance changes predictably with temperature, allowing the board to regulate the bake and broil elements accurately. When the control board detects an open circuit, it means the electrical path through the sensor circuit has been broken, so no valid resistance signal is being received.

The most common cause of an open circuit in this sensor circuit is a failed oven temperature sensor. Sensors can fail internally, breaking the resistive element inside the probe, which results in infinite or unmeasurable resistance across the sensor terminals. Wiring issues are also a frequent culprit: the harness connecting the sensor to the control board can suffer heat damage, fraying, or connector corrosion over time, especially given the thermal environment inside a range. A loose or disconnected connector at either the sensor end or the control board end will also produce an open circuit condition.

Diagnosis should begin with a resistance check of the sensor itself. Disconnect the sensor from the wiring harness and measure resistance across its terminals with a multimeter. A healthy sensor typically reads around 1080 to 1100 ohms at room temperature. A reading of infinite resistance or OL confirms an open sensor that requires replacement. If the sensor reads correctly, inspect the wiring harness for damage and check that all connectors are fully seated before suspecting the control board.