Dacor Range Oven Cooktop Error Code E3

The E3 error code on the Dacor DTF364SIWS indicates a refrigerator air sensor fault. The air sensor, also called the air temperature thermistor, monitors the internal air temperature of the refrigerator compartment and sends resistance-based signals to the control board. When the board detects a signal that falls outside the expected resistance range, it interprets this as an open circuit, short circuit, or disconnected sensor and triggers the E3 code. This type of sensor typically changes resistance in proportion to temperature, so an open circuit produces an abnormally high or infinite resistance reading, while a short produces a near-zero resistance reading.

The most common causes of this fault are physical disconnection of the sensor wiring harness, a broken or corroded connector, or a failed thermistor element within the sensor itself. Wiring harness issues can result from repeated door movement, vibration, or rodent damage. The sensor probe may also fail internally due to age or moisture intrusion, which can cause erratic or out-of-range resistance readings even when the wiring appears intact.

Diagnosis should begin by inspecting the sensor connector for loose, corroded, or damaged pins and verifying continuity through the harness. If the wiring checks out, the sensor itself should be tested with a multimeter to confirm it is producing a resistance reading consistent with the ambient temperature. A sensor reading open or shorted to ground confirms component failure and requires replacement. The control board should only be considered a suspect after the sensor and wiring have been ruled out.