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Error code reference

U-Line Ice Maker Error Code No Comm

Unit lost communication between the main control board and the display.

U-Line codesU-Line ice maker codes

Unit lost communication between the main control board and the display.

First step from the service manual

Check display cable. Replace if necessary.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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  • Wiring diagram references and connector pinouts from the OEM service manual
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What No Comm means on a U-Line ice maker

The "No Comm" error on a U-Line ice maker indicates that communication has been lost between the main control board and the display board. These two components rely on a data signal path, typically through a ribbon cable or wiring harness, to exchange operational information. When that signal is interrupted or degraded, the display can no longer receive data from the main board, and the unit registers this fault to alert the user or technician.

The most common point of failure in this communication loop is the display cable itself. This cable can become loose at either connector end, develop a break in the conductor traces from repeated flexing or physical stress, or suffer corrosion at the terminal points due to moisture exposure inside the unit. A damaged or improperly seated cable is the first component to inspect before moving on to the boards themselves.

If the cable checks out visually and electrically, attention should shift to the display board and the main control board. A failed display board may be unable to receive or process the incoming signal, while a failed main control board may not be generating the communication signal at all. Because both boards are involved in this communication path, a systematic approach starting from the cable and moving outward to each board is the correct diagnostic sequence.

Source: manufacturer service documentation.

Common causes of No Comm

  1. 01

    Loose or disconnected display cable

    Wiring / connection

    The cable connecting the display to the main control board may have worked loose from one or both connectors. Reseating the cable firmly at each end often resolves the error immediately.

  2. 02

    Damaged or broken display cable

    Part replacement

    Physical damage such as a pinched, kinked, or torn cable can interrupt the communication signal. Inspect the full length of the cable for visible breaks or worn insulation, and replace the cable if any damage is found.

  3. 03

    Corroded cable connectors

    Wiring / connection

    Moisture inside the unit can cause oxidation at the cable terminals, increasing resistance and degrading the signal. Check connector pins for discoloration or buildup and clean or replace as needed.

  4. 04

    Failed display board

    Part replacement

    If the cable is intact and properly connected, the display board itself may have failed and can no longer process incoming communication from the main board. Board failure can result from power surges or moisture intrusion.

  5. 05

    Failed main control board

    Part replacement

    If the display board tests as functional and the cable is confirmed good, the main control board may not be generating the communication signal. This is the least common cause but requires board replacement if confirmed.

See the test procedure for each cause

Frequently asked questions about No Comm

What does No Comm mean on a U-Line ice maker?
No Comm means the unit has detected a loss of communication between the main control board and the display board. This prevents the two components from exchanging operational data. The error is most commonly caused by a loose, damaged, or corroded display cable connecting the two boards.
How do I fix the No Comm error on my U-Line ice maker?
Start by locating the display cable and checking that it is firmly seated at both connector ends. If the connection is secure, inspect the cable for visible damage such as kinks, cuts, or corrosion at the terminals. Replace the cable if any damage is found. If the error persists after replacing the cable, the display board or main control board may need to be tested and replaced.
Will resetting my U-Line ice maker clear the No Comm error?
A reset may temporarily clear the error code, but it will return if the underlying communication problem is not corrected. Because the fault is caused by a physical issue such as a loose or damaged cable or a board failure, the hardware problem must be addressed to permanently resolve the error.
Is the No Comm error on a U-Line ice maker a safety concern?
The No Comm fault is not a direct safety hazard, but it does indicate that the unit's control and display systems are not functioning correctly. While this is not dangerous, the ice maker may not operate reliably or at all until the communication fault is resolved. It is best to address the error promptly to avoid further issues.
How much does it cost to repair a U-Line ice maker showing No Comm?
Repair costs vary depending on which component has failed. A replacement display cable is typically the least expensive fix, generally ranging from around $10 to $40 for the part. If a display board or main control board requires replacement, parts costs can range from $80 to $300 or more, with additional labor charges if a technician is needed.

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