U-Line E6 Ice Machine Error: Thermistor 2 Shorted
E6 on a U-Line ice machine means Thermistor 2 is shorted and its reading is unusable. The machine makes less ice until the sensor circuit is repaired.
What does U-Line ice machine code E6 mean?
E6 tells you that Thermistor 2, the second temperature sensor on a UONB115, UHNP315 or UCLR1215 from U-Line, is shorted. The control receives a signal that looks like the sensor's wires joined together, so the temperature it gives cannot be used. Less ice is made until the circuit is repaired. If the same sensor were open instead of shorted, you would see E2.
E6 at a glance
- Code
- E6
- Appliance
- U-Line ice machine
- Applies to
- U-Line UONB115, UHNP315 and UCLR1215 machines
- Type
- Needs attention soon
- Can you clear it yourself?
- Sometimes, after the safe checks below
- Most likely cause
- Thermistor 2 has shorted inside
What you may notice with E6
- E6 is shown on the machine display.
- The machine makes less ice than before.
- There may be moisture near the cabinet.
- A restart may help for a short time.
How the ice machine detects E6
When Thermistor 2 works normally, its resistance moves up and down with temperature, and the control converts that into a reading for one stage of the ice cycle. A short changes everything. Current flows through the circuit with almost no resistance, as if the two sensor wires were joined.
That value is far outside what any real cabinet temperature could produce, so the control marks the sensor as shorted and shows E6. It cannot trust the reading, so the stage that depends on it is affected and the machine makes less ice. The short might be in the sensor, in a lead whose insulation has worn or been pinched, or at a wet connector. The open version of the same problem shows E2, which is why the pair is read together when the machine is tested.
Likely causes of E6
- Thermistor 2 has shorted inside
- A pinched lead, or insulation that has worn through
- Moisture at the second sensor's connector is creating a path
Can you keep using the ice machine with E6?
The machine can run in the meantime at reduced output. Watch the bin, and if ice stops or water appears around the cabinet, switch it off and unplug it. A short in a sensor circuit is low voltage, yet moisture near any electrical part deserves care. Keep panels closed and leave the wiring to us.
What you can safely check
- Turn the machine off for a minute and keep your hands out of the cabinet.
- Turn it on again and check the display.
- Wipe up any water around the cabinet.
- Check that the bin door closes fully.
- Leave the covers closed.
- Should E6 come back, contact us.
What our technician does for E6
- Meter-test Thermistor 2 for a short
- Check the lead and connector for pinches, wear or moisture
- Check the board if the sensor and wire test good
- Replace only what fails the test
How to keep E6 from coming back
- Dry up any water near the machine as soon as you notice it.
- Keep humidity down around the cabinet where you can, especially in coastal Florida homes.
- Be careful with the supply and drain lines so they do not rub against sensor leads.
Technical reference
- Code
- E6
- Appliance
- U-Line ice machine
- Control family
- U-Line UONB115, UHNP315 and UCLR1215 machines
- Maker documentation
- U-Line owner manuals and support
- Checked
- November 2026
Code meanings come from the maker’s documentation and our own repair work; we do not reprint the maker’s document. Confirm the full model number before acting on a code. We are an independent repair company, not affiliated with U-Line Corporation.
Related U-Line ice machine error codes
E6 questions
What happens inside when E6 appears?
The control receives a signal that looks like the sensor's contacts are joined together. No real temperature gives that value, so the control rejects it and posts E6.
Will a restart get rid of E6?
It can clear a bad reading that happened once. A sensor that really is shorted will show E6 again before long, and the circuit then needs a meter test to locate the short.
Should I stop running the machine?
Running it for now is fine as long as you keep an eye on the bin. Should ice stop entirely, or water show up near the machine, turn it off and let us know.
Are E6 and E2 the same problem?
They share a sensor. E2 says Thermistor 2 is open and E6 says the same sensor is shorted. The failures are opposite, but the same circuit gets tested.
What should I tell you about E6 on the phone?
Give us the model number and say that E6 is on the display. Mention any moisture you noticed and whether ice output has fallen, since both help us plan the sensor and connector checks.
Need help with E6?
A technician finds the cause at your bar or lanai and puts the price in writing before any part comes out.