U-Line Refrigerator runs constantly
Room Temperature is Hot
Normal operating temperatures for a refrigerator are between 60 and 95 degrees Fahrenheit. The hotter and more humid the air is the less efficient the refrigerator will be, causing it to run more. If possible, keep the refrigerator within the recommended operating temperatures and as cool as possible.
U-Line Refrigerator Compressor
The compressor is the component that pumps refrigerant through the sealed system to cool the appliance. If you’ve determined the fan motors are all working and the thermistor is accurately monitoring the air temperature, it’s possible the compressor itself is inefficient, resulting in it running continuously, although this is not a common problem.
Freezer Temperature is Above 10 Degrees F (-12C)
On “Top Freezer”, “Bottom Freezer”, and “Side by Side” models with one evaporator, the freezer temperature should be below 10 degrees Fahrenheit (-12C). Since the refrigerator compartment gets its cold air from the freezer, if the freezer is not cold enough, the refrigerator compartment will take longer to cool down. As a result, the compressor may run constantly. The freezer temperature should be set between 0 and 5 degrees Fahrenheit (-18 to -15C). If the freezer temperature is too high, ensure that the condenser coils are clear of debris and the condenser fan is working properly. In addition, check to see if frost has accumulated on the evaporator coils. If the evaporator coils are frosted over, part of the defrost system has likely failed.
Door Not Fully Closing
Check to see that the doors are closing properly. If a door bin or food item is keeping the door open slightly the refrigerator may not cool properly, which can cause the refrigerator to run constantly
U-Line Refrigerator Defrost Heater Assembly
The defrost heater assembly turns on several times throughout the day to melt away any frost that may have accumulated on the evaporator coils. If the defrost heater assembly is defective, the refrigerator will not defrost, and frost will continue to accumulate on the evaporator coils. If the evaporator coils are frosted over, the refrigerator will work harder to remove the heat. As a result, the refrigerator will run constantly in an effort to cool down. To determine if the defrost heater is defective, use a multimeter to test it for continuity. If the defrost heater does not have continuity, replace it.
U-Line Refrigerator Defrost Thermostat
If the refrigerator runs constantly, the defrost thermostat might be defective. Several times a day the defrost heater turns on for a few minutes to melt away any frost that may have accumulated on the freezer or refrigerator evaporator coils. In order for this to work, the defrost thermostat has to sense that the coils are cold enough. If the coils are cold enough the defrost heater will turn on. If the thermostat is defective it may not be able to sense the temperature of the coils and then won’t turn on the defrost heater. If the defrost heater doesn’t turn on, the frost will build up on the coils and eventually no air will be able to travel through the coils to provide cooling . The defrost thermostat can be checked for continuity. It should have continuity when it reaches the low temperature of its operating range.
U-Line Refrigerator Thermistor
The thermistor monitors the refrigerator temperature and sends the temperature reading to the control board. The control board regulates power to the compressor and evaporator fan based on the thermistor readings. If both the condenser fan motor and evaporator fan motor are running, you should test it with a multimeter. The thermistor resistance should change in conjunction with the refrigerator temperature. If the thermistor resistance does not change, it’s possible the component is sending an inaccurate temperature reading to the control board resulting in the refrigerator running constantly. A new thermistor should be installed to solve the problem.
U-Line Refrigerator Control Board
If the refrigerator runs constantly, the control board might be defective. A few times a day the control board is supposed to turn off the cooling system and turn on the defrost heater to melt away any frost that may have accumulated on the freezer evaporator coils. If the control board is defective it could cause the system to never cycle into defrost.
U-Line Refrigerator Door Gasket
If the Refrigerator runs constantly the door gasket may be torn or defective, or if the door is not shutting tightly warm air can enter the the refrigerator and cause the evaporator coils to ice over. This happens because humid air from the room is drawn into the refrigerator through the opening at the gasket. As the humidity comes in contact with the cold evaporator coils it condenses and freezes. Normally the defrost system removes this frost and ice. However, if the door gasket is defective the evaporator coils ice over too quickly and the defrost cycle cannot keep up.
Condenser Coils are Dirty
The condenser coils are usually located under the refrigerator. They dissipate heat from the refrigerator as refrigerant passes through them. If debris accumulates on the coils, the refrigerator will have to work harder to remove the heat. If the coils are significantly dirty, the refrigerator will run constantly in an effort to cool down. Your refrigerator’s condenser coils should be cleaned twice a year. Always turn off the power first. You can use a condenser or bottle brush and a vacuum cleaner for best results.
U-Line Refrigerator Evaporator Fan Motor
If the refrigerator runs constantly, the evaporator fan motor might have failed. Every refrigerator has a set of coils called an evaporator. The refrigerator may have one or more evaporator fan motor(s) depending on the model and evaporator locations. The evaporator fan motor circulates the cold air from the coils thru the compartment. If there is only one evaporator it is in the freezer side. If the fan is not working, no cold air will get to the refrigerator compartment. The freezer may still get cold.
U-Line Refrigerator Defrost Control Board
If the refrigerator runs constantly, the defrost control board might be defective. The defrost control board monitors several conditions and determines how often to run the defrost cycle. If the board fails, the refrigerator will not go into the defrost cycle. Eventually, ice will build up on the evaporator coil and then the refrigerator and or freezer will not stay cold enough. This will depend on where the evaporator is located. It’s prudent to check the defrost heater and defrost thermostat for continuity before replacing the defrost control board.
U-Line Refrigerator Defrost Timer
If the refrigerator runs constantly, the defrost timer might be defective. Two or three times a day the defrost timer is supposed to turn on the defrost heater to melt away any frost that may have accumulated on the freezer evaporator coils. If the timer is defective it won’t advance and won’t turn on the heater.
U-Line Refrigerator Main Control Board
If the refrigerator runs constantly, the main control board might be defective. A few times a day the control board is supposed to turn off the cooling system and turn on the defrost heater to melt away any frost that may have accumulated on the freezer evaporator coils. If the control board is defective it could cause the system to never cycle into defrost.
U-Line Refrigerator Closing Cam
A refrigerator door closing cam allows the door to rest in place in the open position and to close securely on its own when the door is swung shut. If a refrigerator door does not close properly, it can cause warm air to enter the compartment, resulting in the compressor running continously in an attempt to maintain a cool temperature. Inspect the closing cam for damage and replace if necessary.
U-Line Refrigerator Condenser Fan Motor
If the refrigerator runs constantly there might be something caught in the condenser fan motor blade, or the condenser fan motor might be defective. The condenser fan motor draws air over the condenser coils to cool them. The condenser fan motor is located underneath the refrigerator near the back. Pull the refrigerator out from the wall and remove the access panel to access it.