U-Line Ice Maker Error Code Temp Hi 6H+

The Temp Hi 6H+ error code on a U-Line ice maker indicates that the temperature in the monitored zone has exceeded the set point by more than 10 degrees Fahrenheit and has remained in that elevated state for longer than six consecutive hours. This is a sustained thermal fault, not a momentary spike. The unit's control board continuously monitors zone temperature against the configured set point, and this code triggers only after a prolonged failure to maintain the target temperature range. The extended six-hour window is designed to filter out brief warm-up events, meaning this code represents a genuine refrigeration or airflow problem that requires diagnosis.

The primary systems to inspect are the refrigeration circuit and the evaporator airflow path. The compressor is responsible for circulating refrigerant and generating the cooling capacity needed to reach and hold set point temperatures. If the compressor is not running, running intermittently, or failing to build adequate head pressure, the zone temperature will drift upward and stay elevated. The evaporator fan moves air across the evaporator coil and distributes cold air through the zone. A failed fan motor or obstructed fan blade will prevent proper heat exchange even if the compressor is operating correctly.

The diagnostic process should also include the relays and DC outputs that control the compressor and evaporator fan. A failed relay can cut power to either component without triggering an obvious electrical fault. Check that the relevant DC outputs on the control board are producing the correct signal when the system calls for cooling. Verify wiring continuity between the control board, relays, compressor, and fan motor. Confirm the evaporator is not heavily frosted over, as frost buildup can block airflow and reduce cooling efficiency enough to sustain a high-temperature condition for hours.