U-Line Ice Maker Error Code Evap T Short

The "Evap T Short" error code on a U-Line ice maker indicates that the evaporator thermistor circuit has detected a short condition. The evaporator thermistor is a temperature-sensing component mounted on or near the evaporator coil. It monitors refrigerant temperatures during the freeze and harvest cycles, feeding data to the control board so the unit can determine when ice has formed and when to initiate a harvest. When the thermistor circuit shorts, its resistance drops abnormally low, signaling a fault that the control board cannot interpret as a valid temperature reading.

A shorted thermistor circuit is distinct from an open circuit fault. In a short, the electrical resistance across the thermistor leads falls well below the expected operating range, often approaching near-zero ohms. This typically results from physical damage to the thermistor cable, such as pinching between panels or components, chafing against a sharp metal edge, or insulation breakdown caused by moisture or ice buildup contacting the wiring. The thermistor itself can also fail internally, causing the short even when the cable appears undamaged.

The first diagnostic step is a careful visual inspection of the thermistor cable from the sensor tip back to the control board connector. Look for pinch points where panels meet, areas where the wire may have been routed too close to moving parts or sharp edges, and any visible insulation damage or corrosion at the connector. If physical damage is found, the cable and thermistor assembly should be replaced. If the wiring appears intact, resistance testing of the thermistor with a multimeter will confirm whether the sensor itself has failed internally.