Ryan Caldwell Key Takeaways
- A U-Line ice maker display carries exactly five faults — E0 through E4 — and there is no E5 or E6 in that set.
- E0 is a door fault; E1, E2, E3 and E4 each name a different thermistor location, so the code tells you which probe to test.
- The same code means different things on different U-Line platforms: E1 is Refrigerator Thermistor Open on the ice maker and Cabinet Thermistor Open on the wine and refrigerator platforms.
- Named conditions such as no ice production or slow recovery are documented service symptoms and never appear on the display.
- Codes 11, 12 and 13 are not part of the documented U-Line set — photograph the display and confirm which appliance you are reading.
The Bottom Line
Read the code, then read the rating plate: on a U-Line ice maker the five display faults are E0 through E4, and four of them point at a named temperature sensor rather than at the ice-making mechanism. A code that returns after one restart is a circuit fault and needs testing, not another restart.
An undercounter ice maker that stops mid-cycle and puts two characters on its display is telling you something specific, and the list it draws from is short. On a U-Line ice maker the display carries exactly five faults, and four of the five point at a temperature sensor rather than at the ice-making mechanism. Knowing which five they are saves a service call that starts in the wrong place.
| Code | What U-Line service documentation calls it | Where to start |
|---|---|---|
| E0 | Upper Door Open | The door and its switch, before anything electrical |
| E1 | Refrigerator Thermistor Open | Sensor circuit in the refrigerated section |
| E2 | Evaporator Thermistor Open | Sensor on the evaporator |
| E3 | Freezer Thermistor Open | Sensor in the freezer section |
| E4 | Ice Maker Thermistor Open | Sensor on the ice-making assembly |
Your Unit Speaks Two Different Languages
This is the part that confuses most owners, and it explains why searching for a U-Line fault often turns up results that do not match what is in front of you. The documentation behind these machines describes problems in two separate ways, and only one of them ever reaches the display.
The first is the electronic code set — the E-series above. These are faults the control board detects and shows you. The second is a set of named service symptoms: no ice production, slow ice recovery, a water supply problem, small cubes. Those are real, documented conditions, they are how a technician classifies what the machine is doing, and none of them produces a code on the screen. If your ice maker is behaving badly with a blank, normal-looking display, you are in the second system, not the first.
The Five Codes and What They Actually Point At
Four of the five U-Line ice maker error codes name a thermistor — a small temperature sensor whose resistance changes with the cold around it. "Open" in this context means the control board is seeing no circuit at all where it expects a sensor: a broken wire, a disconnected plug, a failed probe. It is a wiring-and-sensor diagnosis, not a compressor diagnosis, and that is useful news.
- E0 is mechanical first. Upper Door Open is what it says. Look at how the door closes, whether the gasket is folded, and whether something in the bin is holding it off its seat.
- E1, E2, E3 and E4 name four different locations. Refrigerator section, evaporator, freezer section, ice maker assembly. The code is telling you which probe to look at.
- There is no E5 or E6 here. Those exist on other U-Line platforms. If you are reading E5 or E6 on a display, you are not looking at the ice maker code set.
- A single restart is reasonable. A habit of restarting is not. A power cycle clears a temporary state; a code that comes straight back is a real circuit fault.
Why E1 Does Not Mean the Same Thing on Every U-Line
This trips up owners who search the code alone. On a U-Line ice maker, E1 is Refrigerator Thermistor Open. On the wine cooler, wine fridge, refrigerator and freezer platforms, E1 is Cabinet Thermistor Open. Same two characters, different probe, different place in the cabinet.
The refrigerator platform also carries a code that exists nowhere else — 10E, a door seal alert — and the clear ice machines add P1 for a drain pump circuit. So before you buy a part based on a code, confirm which platform you own from the rating plate. A model number read off the plate settles it in seconds; a code read in isolation does not.
Codes 11, 12 and 13 Are Not in This Set
A lot of people arrive looking for "code 11", "code 12" or "code 13" on a U-Line ice maker. Those numbers are not part of the documented fault set on any U-Line platform we cover, and we are not going to invent a meaning for them. Two things usually explain the search.
The first is a misread display — a narrow character window can make E-codes and digits look alike, especially through a toe-grille at floor level. Photograph the display with a phone and zoom in; it is the fastest way to be sure. The second is a different appliance entirely. Plenty of kitchens have a built-in refrigerator with its own ice maker, and that machine has nothing to do with the U-Line code set. Identify the cabinet, then read the code.
What You Can Safely Do Before Calling
These checks need no panels removed and no tools beyond a flashlight. They are the ones U-Line documentation repeats most often, and they resolve a meaningful share of complaints on their own.
- Write the code down before you clear it. Once it is gone, the technician is guessing.
- Close and reopen the door deliberately. Watch whether the gasket seats all the way around.
- Check the water supply is open and the line is not kinked. A starved machine produces symptoms that look electronic.
- Confirm the unit is level and the grille is clear. Both affect the ice cycle far more than owners expect.
- Restart once, then stop. If the code returns, further restarts only delay the diagnosis.
If the display stays clean but no ice arrives, read our page on no ice production instead — that is the symptom system, and it has its own checks. Our guide to a U-Line ice maker that is not working covers the overlap between the two.
When It Becomes Sensor Work
A thermistor fault is not a part you should guess at. The probes sit behind panels, they are matched to the control board, and replacing the wrong one leaves you with the same code and a smaller wallet. Our U-Line ice maker repair service tests the sensor circuits directly rather than swapping parts in sequence.
Work in this territory starts from $75 for the door and simpler circuits and from $120 where the sensor chain has to be traced through the cabinet. The final price is confirmed after the on-site diagnosis, and you get a written estimate before any work begins. Have the model number and the exact code ready when you book a visit — those two facts decide which parts come on the truck.