Samsung Range Error Code Top Sensor Open

The Top Sensor Open error on a Samsung range indicates that the cooktop temperature sensor has reported an analog-to-digital (A/D) conversion value exceeding 252 as read by the MICOM (microcomputer control board), or that the ambient temperature detected has fallen below -10 degrees Celsius. The cooktop sensor is a thermistor-type component that changes its electrical resistance in response to temperature. When the sensor circuit is open, meaning the circuit is broken or the resistance is out of range, the MICOM receives an abnormal signal and triggers this fault code to prevent unsafe operation.

The three primary causes for this error are a defective sensor, improperly connected or misrouted sensor wiring, and a faulty PCB (printed circuit board). An open circuit condition in the sensor means the MICOM is reading essentially infinite or out-of-range resistance instead of a normal thermistor resistance value. This can occur if the sensor itself has failed internally, if the sensor connector has pulled loose from its socket, or if the wire harness has been routed incorrectly relative to the burner position it is assigned to monitor.

Diagnosis begins by confirming the sensor is physically connected at both the sensor end and the PCB connector. Each sensor is position-specific, so verifying correct wire-to-burner alignment is critical before condemning a part. A multimeter resistance check across the sensor terminals will confirm whether the sensor itself is open. If the sensor measures within normal thermistor range but the error persists, the PCB may be the source of the fault.