U-Line Freezer No Comm: Display Lost Contact With Control
No Comm on a U-Line freezer means the display and the main control board have stopped exchanging data. The freezer may still run, but the panel readings and settings become unreliable.
What does U-Line freezer code No Comm mean?
U-Line freezers show No Comm when the display and the main control board can no longer exchange data. The board that runs the freezer and the panel you read have stopped trading information. A loose display or data cable, a display that has failed, or a main control board that has failed are the three causes tied to this code. The message itself does not say which of the three it is, so the next step is to find where the link breaks.
No Comm at a glance
- Code
- No Comm
- Appliance
- U-Line freezer
- Applies to
- U-Line freezers with a display and main control board
- Type
- Needs attention soon
- Can you clear it yourself?
- Sometimes, after the safe checks below
- Most likely cause
- A loose display or data cable between the panel and the board
What you may notice with No Comm
- The display shows No Comm instead of a temperature
- Buttons on the panel do nothing when pressed
- The display may go blank or flicker after a power interruption
- The freezer may still feel cold, but you cannot confirm the setting
How the freezer detects No Comm
A U-Line freezer splits its job between two electronics. The main control board reads the sensors and runs the cooling, while the display shows you the temperature and takes your settings. The two are joined by a data cable and pass short messages back and forth all the time.
The control expects those messages to keep arriving. When they stop, because a plug has loosened, a part has stopped answering or the board is not sending, the control reports No Comm. It is a message about the link between the parts, not about the temperature. The freezer may keep cooling on its last settings, but you lose the means to read or change them.
Likely causes of No Comm
- A loose display or data cable between the panel and the board
- A display that has stopped working
- A main control board that has stopped sending data
Can you keep using the freezer with No Comm?
You can usually keep the freezer plugged in for a short time, but watch it closely. With the display link down you cannot read the temperature, so place a thermometer inside and check it at regular intervals. If the inside warms, you hear anything unusual, or the message does not clear after a restart, plan to move food and have the freezer checked.
What you can safely check
- Unplug the freezer or switch off its breaker before doing anything else, and keep the door closed to hold the cold in.
- Leave it off for about a minute, then restore power.
- Watch the display as it starts and note whether No Comm returns right away or after a while.
- Check that the display looks undamaged and is not wet or cracked, without removing any panel.
- If No Comm comes back, call us and say whether the freezer still seems to be cooling.
What our technician does for No Comm
- Inspect and reseat the display and data cable connections
- Test the display on its own to see if it is the part that has failed
- Test the main control board output to decide whether the board needs replacing
How to keep No Comm from coming back
- Avoid pulling or pushing on the control panel when cleaning around it
- Use a surge protector, since Florida storms can send power spikes through the home
- Keep water and cleaning spray away from the display area
- Do not unplug the freezer repeatedly while it is running unless you are testing it
Technical reference
- Code
- No Comm
- Appliance
- U-Line freezer
- Control family
- U-Line freezers with a display and main control board
- 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 freezer error codes
No Comm questions
Is the freezer still cooling when No Comm shows?
It may be, but you cannot count on it. The display link is down, so you cannot read the temperature on the panel. Put a thermometer inside and watch it until the problem is sorted out.
Will unplugging it for a minute fix the code?
Sometimes a restart lets the display and board reconnect, and it costs nothing to try. If the message returns, the link itself has a problem such as a loose cable or a failed part.
Is the display or the board to blame?
The message cannot tell you. A cable, the display and the board are all possible, which is why a technician tests each link in the chain instead of replacing parts by guesswork.
Can a power surge cause No Comm?
It can contribute, because a surge may damage the display or the board that talks to it. If the message appeared right after a storm or an outage, mention that to the technician so the electronics are tested first.
Does No Comm mean I need a new freezer?
Not at all. The message points to a broken link, and links are often repaired by reseating a cable or replacing one part. Replacement of the whole freezer is not what this code, by itself, indicates.
Need help with No Comm?
A technician finds the cause at your bar or lanai and puts the price in writing before any part comes out.