The U-Line ice maker E6 error appears when the evaporator temperature sensor circuit has shorted. This disrupts the control’s ability to manage both cooling and defrost timing, two functions the unit depends on to keep producing ice consistently.
Understanding the U-Line Ice Maker E6 Error
Below, our specialists break down everything you need to know about the U-Line Ice Maker E6 Error.
What the E6 code means
E6 flags a short in Thermistor 2, the sensor mounted at the evaporator that tracks its temperature during the freeze and defrost phases. When this circuit shorts, the reading falls outside a valid range, so the control can no longer use it to decide when to run defrost or how to regulate the freeze cycle. The result is a control system that’s effectively flying blind on evaporator conditions.
Because the evaporator sits in one of the coldest, most humid parts of the ice maker, its thermistor and connector are more exposed to condensation cycling than the cabinet sensor is. A short here behaves differently from the open circuit covered under E2: the control is still getting a signal, it’s just one that falls outside any range a real evaporator temperature could produce. Once that happens, the board can no longer trust the reading and raises E6 instead of acting on it.
Common causes
- Internal failure of the evaporator thermistor causing a short circuit
- Moisture or condensation at the sensor connector, common in the cold evaporator area
- Frayed or damaged wiring insulation allowing contact between conductors
- A pinched or compressed harness near the evaporator coil
- Repeated freeze-thaw cycling degrading connector seals over time
Symptoms you may notice
- E6 shown on the control display
- Ice production that slows, stalls, or becomes irregular
- Frost or ice buildup on the evaporator coil from mistimed defrost cycles
- Unusual run times as the compressor and control react to bad sensor input
- The code appearing intermittently at first, then more consistently as the short progresses
How to troubleshoot it
- Unplug the unit before inspecting the evaporator area or wiring.
- Examine the evaporator thermistor connector for moisture, corrosion, or a loose fit.
- Check the sensor’s wire run for insulation damage or pinch points near the coil housing.
- Dry any visible moisture around the connector before reseating it and restoring power.
- If wiring appears intact, the thermistor has likely shorted internally and needs replacement.
- Because confirming a short typically requires meter testing at the harness, this step is best handled by a technician.
When to call a technician
A shorted evaporator thermistor circuit usually calls for sensor replacement after testing confirms the fault. This work involves the evaporator compartment and control board connections, so it should be performed by a qualified appliance technician who can access the coil area safely.
Can you keep using it?
Continued use isn’t recommended while E6 is displayed. With unreliable evaporator temperature data, defrost cycles can run at the wrong times, leading to ice buildup and declining ice production until the sensor is repaired or replaced.
U-Line ice machines are built and documented by the manufacturer in Milwaukee. Original documentation for these units is available from the manufacturer, u-line.com.
