Why Is My Sub Zero Freezer Not Cold Enough?

Problems with the defrost system, dirty condenser coils, fan failures leaky door gaskets, or control problems could result in your Sub Zero freezer not getting cold enough. Although you may notice the cooling issue begin in the freezer, you’ll typically quickly find that the Sub Zero refrigerator and freezer aren’t cooling enough. It is essential to fix the issue immediately to prevent food loss. How can you stop air from leaking into your Sub Zero freezer.

If your Sub Zero freezer is too hot to keep the ice cream frozen and you see lots of frost inside the entire freezer compartment, then warm, moist air may be leaking into your refrigerator. Check all door gaskets to ensure they are not damaged and replace damaged gaskets for the door. If gaskets are in good condition however a door is moving on its hinges, creating gaps between the gasket and the cabinet within door openings, adjust the hinges of your Sub Zero refrigerator so that gaskets can be sealed to the cabinet. If you notice frost accumulation just on the rear freezer wall, the auto defrost system might be malfunctioning. If it is functioning properly, the defrost system melts the frost off the coils of the evaporator every 8 hours or so, to ensure that the air passageways through the evaporator free of obstructions so that the freezer and refrigerator compartments cool properly. The defrost mechanism that is automatic can fail, and frost will accumulate on the evaporator or the back wall of the freezer compartment.

The Sub Zero freezer will not cool as well because the frost blockages the air cooling pathways that run across the evaporator. How to fix other freezer problems If the fan in the evaporator stops working, you should check for cooling inside of the freezer compartment. If it’s not working, replace the fan that is evaporating. Problems with cooling could be due to dirty condenser coils. You should disconnect your Sub Zero refrigerator to check for dust and dirt buildup. If they’re dirty, clean the condenser tubes. Keep cleaning the coils when you perform routine Sub Zero refrigerator maintenance. It is important to determine if the condenser fan turns off when your freezer doesn’t get sufficiently cold. The condenser will not effectively cool refrigerant if the condenser fan doesn’t run. If the fan for the condenser isn’t running, it should be replaced.

These repairs can help resolve the problems with your refrigerator. Replace the Sub Zero refrigerator sensor. The Sub Zero refrigerator sensor, sometimes called the defrost bi metal termination thermostat, will go off when it senses that the temperature of the evaporator is at a high enough level that it could overheat. The defrost sensor will go off when it detects that the heater is too hot. If the sensor for defrost is not functioning correctly, frost builds up on the fins of the evaporator, eventually making the refrigerator and freezer not cool properly. To determine if there is continuity, use a volt/ohm tester. If it doesn’t show continuity at 0 degrees F, replace the defrost sensor. Clean the Sub Zero condenser coils of the refrigerator The dust-covered Sub Zero refrigerator coils could prevent the Sub Zero refrigerator and freezer from running efficiently and cooling properly.

Follow the steps in the owner’s manual to cleaning the condenser coils. Before taking care of the coils, unplug the electrical outlet of your Sub Zero refrigerator. The majority of Sub Zero refrigerators have coils behind the front grill. Use the coil brush to clean the coils. Replace the Sub Zero refrigerator compressor condenser Fan: This fan is located in the machine compartment of the Sub Zero fridge close to the compressor. It circulates air over the condenser coils in order to chill the refrigerant that is hot that is coming from the compressor. The refrigerant is cooled before it moves through the expansion device before moving into the evaporator.

Replace any condenser fan that is defective. Repair the Sub Zero refrigerator freeze system. The Sub Zero refrigerator’s auto defrost feature regularly melts the frost off its evaporator to improve the exchange of heat. The compressor will stop, and the defrost heating component turns on. If the compressor ceases to operate the frost melts off the fins of the evaporator. The condensate is dripped to an evaporator tray beneath the evaporator. From there it flows through a defrost tube to the drain pan adjacent to the compressor. Before the next defrost cycle the condensate water evaporates out of the drain pan. If the defrost process fails, diagnose and repair the problem.

Replace the Sub Zero refrigerator fan: The fan is mounted on the top of the unit that evaporates. It moves air across the evaporator fins and through the cabinet to cool. It is possible to replace the evaporator fan in the event that it is damaged. The Sub Zero refrigerator temperature controller board needs to be replaced. It’s located inside the machine compartment, near the compressor. It is hidden behind a panel that is located at the back of the Sub Zero refrigerator. The temperature control board regulates the compressor, as well other major elements of the Sub Zero Refrigerator. You can test it out by following the instructions in the tech sheet. If it’s not working properly or the thermostat control board stops working You can change it. The Sub Zero refrigerator temperature thermostat thermostat needs to be replaced. The thermostat is equipped with a sensor tube attached to it, which detects temperature inside the Sub Zero refrigerator cabinet. The cabinet’s temperature is managed by the thermostat by turning on and off the compressor according to the temperature sensor tube. If the thermostat fails to detect the temperature properly or the compressor isn’t functioning properly, you should replace it. The Sub Zero refrigerator’s thermistor should be replaced.

A faulty thermistor can transmit temperature data to the thermostat. Replace the Sub Zero refrigerator freezer defrost motor: The controller for defrost is an electronic device that controls the time between defrost cycles that are automated in the Sub Zero refrigerator. The motor that controls the defrost timer moves the control parts. If the contact contacts for defrost move to the defrost cycle the compressor stops. The defrost heater is turned on for a predetermined time to melt off the frost of the evaporator fins. This promotes an efficient heat exchange across the evaporator. This will ensure that the Sub Zero refrigerator will continue to cool after the designated period of defrost. If the defrost temperature sensor isn’t working then it must be replaced.

The timer’s contacts are not working properly. can also cause the defrost heater to either not energize at all or constantly energize. In this case, you must replace the timer for defrost. Adjust the refrigerator or freezer door. The hinges of the doors to freezer and refrigerator can be bent or damaged. Doors can shift as time passes. This can allow warm humid air to pass through the door of the freezer or refrigerator, which creates excessive frost, which could eventually cause the drain tube and drain tube to freeze. The refrigerator repair involves aligning and fixing the hinges to ensure that they function properly. Replace the Sub Zero refrigerator’s door gasket. This attaches to the freezer or fridge door panel. It prevents air from entering or leaving the cabinet when it is shut. If the door is shut the gasket can become worn and permit warm, humid, air to get into the refrigerator. This could cause cooling problems and excessive frost. Replace the seal on the door in the event that it is damaged or damaged or torn.

Replace the Sub Zero refrigerator’s electronic control board. The electronic controlboard is also known as the main control or power control boards (PCB), controls the compressor and defrost cycles. If it detects that the compressor must be running to keep the refrigerator cool, it will send voltage to the compressor and fans. The temperature sensors send signals to the electronic control board which monitors the temperatures in the refrigerator and freezer. The electronic control boards controls the defrost cycles using this data. To determine the efficiency of the electronic control board, you can perform an examination for diagnostics. Although the test can vary by model, the most common one is the Forced Defrost. The instructions on how to run diagnostics in the tech manual. Change the control board’s electronic circuit if it’s not functioning correctly.


Maintenance routine for Sub Zero refrigerators:

Dusty refrigerator coils can cause problems with the freezer and refrigerator’s ability to cool properly and operate efficiently. Clean the heating coils of the condenser in accordance with the owner’s manual. Prior to cleaning the coils and accessing them, unplug the Sub Zero refrigerator. The majority of refrigerators have coils behind the front grill. Clean the condenser coils using the help of a coil brush. Regular maintenance includes replacing the water filter, clearing the dust from the bottom of the grille as well as adjusting the hinges in case doors aren’t closing properly.