Display shows Lo and the set temperature cannot be adjusted lower; unit may be running continuously.

Safety: No internal high-voltage work is usually required, but unplug the unit if removing panels.

Steps:

• 1. Verify actual temperature: Use a separate thermometer to check the interior. If it is extremely cold (near or below freezing), raise the set temperature and allow the unit to warm slightly.
• 2. Power cycle: Unplug the cooler for 5–10 minutes, then plug back in to clear any temporary logic error.
• 3. Check sensor placement: Ensure the thermistor is not directly touching the evaporator plate or a cold spot; reposition slightly if possible.
• 4. Test thermistor: If Lo persists and the interior is not excessively cold, test the thermistor resistance. Replace if readings are far from expected values.
• 5. Firmware/board: If sensor is good, the control board may have a firmware or calibration issue and may need replacement.