U-Line Refrigerator Error Code No Comm

No Comm means the main control board and the display board have lost communication with each other. The two boards rely on a continuous data signal to coordinate refrigerator operation, and when that signal is interrupted, the unit displays this fault. It can result from something as simple as a power disruption or something more involved like a wiring fault or a failed board.

Start by disconnecting power to the unit for at least one to two minutes and then reconnecting it. If the error clears, no further action is needed. If it persists, inspect the wiring harness between the main control board and the display for loose, damaged, or corroded connectors. If the wiring appears intact, contact U-Line Customer Care or a qualified technician to diagnose whether the display board or main control board needs replacement.

If the issue is resolved by a power cycle, there is no cost involved. If a technician is needed, a service call typically runs in the range of $75 to $150 before any parts. Replacing a display board or main control board on a U-Line unit can add $150 to $400 or more depending on the specific model and part pricing. Getting a diagnostic assessment first will help clarify which component, if any, needs to be replaced.

A power reset is the first recommended step and will clear the error if it was caused by a temporary firmware lockup or power fluctuation. Disconnect the unit from power for one to two minutes, then restore power and check whether the error returns. If the No Comm fault comes back after resetting, a hardware issue with the wiring or one of the control boards is likely the cause.

The No Comm error itself is not a direct safety hazard, but it does indicate that the control system is not operating normally. If the main board and display board cannot communicate, the refrigerator may not maintain accurate temperature control, which could affect food safety over time. Addressing the error promptly is advisable to ensure the unit is operating as intended.