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

This code means the right zone temperature has been more than 10 degrees below the configured set point for over 12 continuous hours. It signals a sustained over-cooling condition rather than a brief temperature dip. The most likely causes involve the compressor, evaporator fan, or the relays and DC outputs that control those components. A technician should inspect those parts to identify what is preventing normal temperature cycling.

A power reset may temporarily clear the fault code from the display, but it will not resolve the underlying mechanical or electrical issue causing the right zone to over-cool. If the root cause is not corrected, the fault condition will continue and the error will return after another 12-hour period of sustained low temperature. Resetting should be used only after a repair has been made, to confirm the fix was successful.

Repair costs vary depending on which component has failed. Replacing a relay or thermistor is generally less expensive, often in the range of $100 to $250 including labor, while a faulty control board or compressor repair can run $300 to $600 or more. A technician will need to diagnose the specific failed component before an accurate estimate can be provided.

Some preliminary checks, such as confirming the unit has adequate clearance for airflow and verifying no ice buildup is blocking the evaporator fan, can be done without special tools. However, testing relays, DC output signals, compressor cycling, and thermistor resistance requires a multimeter and working knowledge of refrigeration control systems. Most homeowners will need a qualified appliance technician to complete a proper diagnosis and repair.

The unit is running colder than intended in the right zone, which can affect ice quality and may stress refrigeration components over time. While the appliance is not typically a safety hazard to people in the way a gas appliance might be, running in a sustained fault condition can cause additional component wear. It is best to have the unit inspected and repaired promptly rather than continuing to operate it in a known fault state.