U-Line Nugget Ice Machine Code E3: Third Sensor Open

What E3 means

On U-Line ice machines such as the UONB115 and UHNP315, E3 means Thermistor 3 is open. The control has lost the signal from its third temperature sensor. Clear ice machines such as the UCLR1215 never show E3. The display shows E3, and the ice cycle runs without that reading until the circuit is repaired. E7 is the shorted version of this reading.

Common causes of E3

Thermistor 3 has failed open
A sensor wire or its connector has loosened
The control input is not reading the sensor

✓ One safe check you can try

1. Switch the machine off, wait a minute and restore power. 2. Keep the area around the cabinet clear for airflow. 3. Check that the bin door closes fully. 4. Do not open panels. 5. Call us if E3 returns.

! Why to stop there

Locating an open circuit takes meter testing
A guess at the sensor can leave the real cause in place
We state the price before work and warrant the repair for 30 days

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

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Other Ice Machine codes

Ice / Off scrolling with SPU-Line Echelon 2000 Message "Ice / Off scrolling with SP": ice maker off mode CLRCO2075 LED 3 flashingU-Line CLRCO2075 LED 3 flashing: drain pump blocked or overloaded CLU-Line Echelon 2000 Message "CL": self-cleaning cycle running CLR2060 one flashU-Line CLR2060 One flash: overflow protection circuit open CLR2060 two flashesU-Line CLR2060 Two flashes: open thermistor or too warm CLRCO2075 LED 2 flashingU-Line CLRCO2075 LED 2 flashing: open thermistor E6U-Line Ice Machine Code E6 Reads Sensor 2 as Shorted E7U-Line Nugget Ice Machine Code E7: Third Sensor Shorted

E3E3 questions

Does the UCLR1215 show E3?

No. On the clear ice UCLR1215, E3, E4, E7 and E8 do not apply. Those codes belong to the other U-Line ice machines, such as the UONB115 and UHNP315.

What does E3 mean?

E3 is Thermistor 3 open. The control gets no signal from that sensor, so the ice cycle loses one of its temperature readings. Testing the sensor path shows which part needs work.

Is there a matching shorted code?

Yes. E7 reports Thermistor 3 shorted, so E3 and E7 describe the same sensor in its two failure conditions, and both are checked the same way.