When the display shows a U-Line crescent ice machine E6 error, the evaporator temperature sensor circuit has shorted. Unlike a simple loose wire, a short means the control is receiving a signal that’s out of the valid range, which throws off the cooling and defrost logic that governs how crescent cubes form on the evaporator, and it’s a fault the control can’t work around on its own.
Understanding the U-Line Crescent Ice Machine E6 Error
Below, our specialists break down everything you need to know about the U-Line Crescent Ice Machine E6 Error.
What the E6 code means
E6 corresponds to thermistor 2, the evaporator sensor, reporting a shorted circuit. The control depends on this reading to know when to run cooling and when to switch into defrost between ice-making cycles; a short here means that logic is now working off bad data, so the board flags the fault instead of continuing to operate normally on an unreliable signal.
Common causes
- Internal failure of the evaporator thermistor causing a circuit short
- Wiring insulation damaged near the evaporator, letting conductors touch each other or the cabinet
- Moisture buildup at the sensor connector, common in the cold, humid space around an evaporator
- A harness pinched by ice buildup or during a prior service or installation
- Repeated freeze-thaw stress on the sensor lead over years of normal operation
Symptoms you may notice
- E6 shown on the control display
- Irregular frost patterns on the evaporator — either excessive buildup or none at all
- Ice production stalling, slowing, or crescent cubes coming out small, hollow, or clumped
- Compartment temperature swinging in ways that don’t match the door or water supply conditions
- A harvest cycle that seems to run longer or shorter than the ice level in the bin would suggest
How to troubleshoot it
- Unplug the unit first
- Look for visible frost irregularities or moisture around the evaporator area that might point to the short’s location
- Check any accessible harness runs near the evaporator for obvious wear or pinching
- Power the unit back on briefly to note whether E6 is constant or comes and goes
- Keep a note of when the frost pattern or ice output changed noticeably, since that timeline helps a technician isolate the fault faster
- Leave testing and replacement of the thermistor to a technician — it’s located inside the sealed ice-making compartment and diagnosing a short correctly requires a meter and safe access
When to call a technician
Because E6 is not resettable and points to a genuine hardware short, a technician needs to confirm the fault, replace the evaporator thermistor, and inspect the harness for what caused the short in the first place, so the repair holds.
Can you keep using it?
It’s best to stop relying on the unit for ice production until this is fixed. A shorted evaporator sensor can cause defrost cycles to run at the wrong times, leading to frost buildup or icing over that reduces airflow and ice output, or puts unnecessary strain on the system.
U-Line crescent ice makers are built and documented by the manufacturer in Milwaukee. You can confirm model details and manuals on the manufacturer’s site, u-line.com.
