Viking Ice Maker Error Code 3 blinks

Three blinks on a Viking ice maker indicates that the control board has detected an open or shorted evaporator thermistor circuit. The thermistor is a temperature-sensing resistor that monitors the evaporator temperature during the ice-making cycle. Some references also link this code to a bin sensor fault. The ice maker will not operate normally until the fault is resolved.

A reset may temporarily clear the blink sequence, but the error will return if the underlying thermistor fault is still present. Because the control board actively monitors the sensor circuit during operation, it will detect the open or short condition again and re-trigger the fault code. The thermistor or its wiring must be repaired or replaced to permanently resolve the issue.

If the evaporator or bin thermistor is the only failed component, parts costs are generally modest, typically in the range of $20 to $80 depending on the specific sensor required. If a professional technician is needed for diagnosis and replacement, labor costs will add to that total and can vary significantly by region. In the less common scenario where the control board is also involved, repair costs will be considerably higher.

Start by disconnecting the evaporator thermistor and measuring the resistance across its wire leads with a multimeter. Compare that reading to the Resistance versus Temperature Chart for your unit to determine if the sensor is within specification. If the resistance is infinite or near zero, the thermistor needs to be replaced. Also inspect the wiring harness and connector pins for damage or corrosion before assuming the sensor itself is faulty.

The ice maker is designed to halt normal operation when this fault is active, so it will not be producing ice in most cases. Continuing to run the unit without addressing the sensor fault is not recommended, as the control board relies on thermistor data to regulate the freeze and harvest cycles safely. Resolving the fault before resuming use is the correct approach.