Electrolux Ice Maker Error Code SLOW_FLASH

The SLOW_FLASH LED pattern on an Electrolux ice maker indicates the control board has detected a fault in the thermistor circuit. The thermistor is a temperature-sensing resistor that provides the control board with real-time temperature data from inside the ice maker. When the board loses a valid signal from this sensor, either because the thermistor plug has come loose from the board or because the thermistor itself has failed to an open circuit condition, it signals the fault through the slow LED flash pattern and typically halts normal ice production cycles.

The two most common root causes are a disconnected thermistor plug and a thermistor that has failed open. A disconnected plug creates an open circuit in exactly the same way a failed component would, so the control board cannot distinguish between the two conditions electrically. An open-circuit thermistor means the resistive element inside the sensor has broken down, sending infinite or unmeasurable resistance to the control board instead of the expected resistance value that corresponds to a specific temperature.

Diagnosis begins by physically inspecting the thermistor connector at the control board to confirm it is fully seated and locked. If the connector is secure, the thermistor itself should be tested with a multimeter set to resistance mode. A thermistor that reads OL or infinite resistance at normal ambient temperature has failed open and requires replacement. A thermistor reading a finite resistance value consistent with the ambient temperature indicates the sensor is intact, and the fault may point to wiring or the control board itself.