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I. First Inspection Check: Temperature Setting
Confirm that the unit's temperature control setting is correct and has not been mistakenly changed or adjusted.

II. Normal Temperature Standard
The actual temperature inside the compartment should be within ±4℃ of the set temperature. Anything outside this range is abnormal. Check the following six points for quick troubleshooting:

1. Slow Cooling: Loading hot goods, lack of pre-cooling, or frequent door opening are operational issues, not unit malfunctions.

2. Defrosting Heating: A temporary temperature rise during/ immediately after defrosting is normal.

3. Evaporator Frost Blockage: Excessive frost buildup affects cooling; manual defrosting will restore cooling.

4. Poor Cold Air Circulation: Goods obstructing the air vents or a loose/slipping fan belt can both lead to weak cooling.

5. Unit Tripping/Shutting Down: Unstable voltage or overload tripping may result in apparent power but no cooling. Troubleshoot and reset/restart.

6. Low Refrigerant Level: If the refrigerant level is not visible through the sight glass, it indicates a refrigerant shortage, requiring professional inspection and refilling.

Additional Must-Do: After each 4-hour inspection, manually defrost the unit to maintain stable cooling!