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Troubleshooting Excessive Frost Buildup in Commercial Fridges

  • Commercial refrigerators are crucial for businesses in the food industry, providing a controlled environment to preserve perishable items. However, one common issue that can arise is excessive frost buildup, which compromises the fridge's performance and poses a risk to the stored inventory. Calling commercial fridge repair experts on time can solve the issue impeccably. In this guide, we will examine the causes of undue frost buildup in commercial fridges and provide detailed steps for troubleshooting and repairing this issue.

    What is Excessive Frost Buildup?

    Excessive frost buildup in commercial fridges occurs when moisture in the air condenses and freezes on the evaporator coils or other surfaces within the unit. It can lead to various problems, including decreased cooling efficiency, obstructed airflow, and increased energy consumption. Several factors can contribute to excessive frost accumulation:

    1. Poor Door Seals: Damaged or worn-out door seals allow warm, moisture-laden air to enter the fridge, leading to condensation and frost formation.
    2. Defective Defrost System: A malfunctioning defrost system can fail to remove frost from the evaporator coils, causing it to accumulate over time.
    3. Blocked Drainage System: If the drainage system is clogged or blocked, melted frost cannot drain properly, leading to water accumulation and subsequent frost buildup.
    4. Overloading: Overloading the fridge with food items can impede airflow, leading to uneven cooling and increased moisture levels, which contribute to frost formation.

    Troubleshooting Excessive Frost Buildup:

    Before proceeding with a commercial fridge repair, it's essential to know the underlying cause of the excessive frost buildup. Here are the steps for troubleshooting:

    1. Check Door Seals: Inspect the door seals for any signs of damage, wear, or debris. Close the door and place a piece of paper between the seal and the fridge frame. If the paper can be easily pulled out, it indicates a faulty seal.
    2. Test Defrost System: Manually set up the defrost cycle according to the manufacturer's instructions. Monitor the evaporator coils for signs of defrosting. The defrost system may be defective if the coils do not defrost properly.
    3. Clear Drainage System: Eliminate any debris or blockages from the drainage system, including the drain pan and drain line. Ensure that water can circulate freely to prevent frost buildup.
    4. Evaluate Temperature Settings: Check the temperature settings on the fridge's thermostat to ensure they are set correctly. Wrong temperature settings can contribute to frost formation.

    Repairing Excessive Frost Buildup:

    Once the underlying cause has been known, you can proceed with the necessary commercial fridge repair:

    1. Replace Door Seals: If the door seals are damaged or worn, replace them with new ones to ensure a proper seal. Clean the seal area thoroughly before installing the new seals. Call a certified commercial fridge repair technician to do the job seamlessly.
    2. Repair Defrost System: If the defrost system is malfunctioning, troubleshoot the individual components, including the defrost heater, defrost thermostat, and defrost timer. Replace any defective components as needed by hiring top commercial fridge repair technicians.
    3. Clear Drainage System: Use hot water, mild detergent, and a pipe brush to clear any blockages in the drainage system. Ensure the drain pan is located correctly, and the drain line is free from obstructions.
    4. Adjust Temperature Settings: Fine-tune the temperature settings on the fridge's thermostat to maintain optimal cooling conditions and prevent excessive frost buildup.

    Preventative Maintenance:

    To prevent future occurrences of excessive frost buildup, implement regular maintenance procedures:

    1. Clean the evaporator coils and condenser coils regularly to ensure efficient heat transfer and airflow. Hire professionals on time to get them cleaned as they have the expertise.
    2. Check and replace air filters to keep proper airflow and thwart dust and debris buildup.
    3. Track temperature and humidity levels inside the fridge and adjust settings accordingly to prevent moisture accumulation.
    4. Schedule periodic reviews by a skilled commercial fridge repair technician to detect and address any likely issues before they escalate.


    Excessive frost buildup in commercial fridges can pose significant hurdles for businesses in the food industry. By knowing the underlying causes and following the troubleshooting and repair steps outlined in this guide, you can effectively fix this issue and restore the efficient operation of your commercial fridge. Implementing preventative maintenance measures will help mitigate future occurrences and ensure the longevity of your refrigeration equipment. Contact the experts of Speedy Appliance Repair for the finest commercial fridge repair services at competitive rates.