Display shows L1, unit indicates low temperature alarm, ice may freeze into a solid block.

Safety: Unplug the unit before accessing sensors or the control board.

Sensor check:

• Locate the cabinet temperature sensor (NTC) and ensure it is properly mounted and not in direct contact with the evaporator plate, which can cause falsely low readings.
• Inspect wiring for damage and reseat connectors.
• Test sensor resistance at room temperature and compare to specifications. Replace the sensor if readings are out of range.

Control board:

• If the sensor is good but L1 persists and the compressor runs excessively, the main control board may have a stuck relay or calibration fault and should be replaced.

Interim step: Power cycle the unit to clear temporary faults, but do not ignore recurring L1 alarms as they can lead to over-freezing and mechanical stress.