U-Line Ice Maker Error Code Temp Lo 12H+

The Temp Lo 12H+ code means the zone temperature inside your U-Line ice maker has been more than 10 degrees Fahrenheit below the set point for over 12 hours. It indicates the cooling system is running too aggressively or the temperature sensor is reporting an incorrect reading. The 12-hour duration requirement means this is a persistent condition, not a brief fluctuation, and requires diagnostic attention.

A reset may temporarily clear the error code from the display, but if the underlying fault is still present the code will return once the unit has been running long enough to detect the same overcooling condition again. Resetting without fixing the root cause is not a permanent solution. The compressor, relays, fan, and control board outputs should be diagnosed before relying on a reset.

Repair costs depend on which component has failed. A relay replacement is typically among the least expensive fixes, generally ranging from around $50 to $150 including parts and labor. Control board replacement or compressor work can push costs into the $200 to $600 range or higher depending on the specific model and labor rates in your area. A proper diagnosis is needed before accurate cost estimates can be given.

Start by checking the compressor to see if it is running continuously without cycling off, then inspect the relays and DC control outputs from the board to confirm they are operating correctly. The evaporator fan and its associated wiring should also be examined. If a relay is stuck closed or the control board is outputting a constant run signal, those components will need to be repaired or replaced.

Continued operation while this fault is active is not recommended. A compressor running without cycling off can overheat and sustain internal damage over time. Additionally, if the overcooling condition is genuine rather than a sensor error, it may affect ice production quality. It is best to have the unit serviced promptly to prevent further damage.