U-Line Ice Maker Error Code E8

The E8 error code on a U-Line ice maker indicates that Thermistor 4, the ice maker thermistor, has developed a short circuit condition. A thermistor is a temperature-sensitive resistor whose resistance changes predictably with temperature. When the control board reads an abnormally low resistance value from this thermistor, it interprets the signal as a short and triggers the E8 fault. This sensor is responsible for monitoring ice maker compartment or evaporator temperatures, and without accurate readings, the unit cannot safely manage its freeze and harvest cycles.

A shorted thermistor typically produces a resistance reading near zero ohms or well below the expected value for the ambient temperature range. In contrast, a normal thermistor will show a specific resistance that corresponds to the surrounding temperature, often several thousand ohms at typical operating conditions. The short can occur within the thermistor itself, in the wiring harness connecting it to the control board, or at the connector terminals where corrosion or moisture bridging can create an unintended low-resistance path.

Diagnosing E8 begins with a visual inspection of the thermistor's wiring and connector for signs of damage, pinching, or moisture intrusion. After that, an OHM test of the thermistor with the connector unplugged will confirm whether the sensor itself is the source of the fault or whether the wiring circuit is responsible. If the thermistor reads a near-zero resistance when disconnected from the harness, the component requires replacement. If resistance reads correctly at the sensor but the error persists, the wiring or control board connection point should be investigated further.