Appliance tip of the week...

The 8 most common part(s) or condition(s) which cause the symptom Freezer runs all the time are listed below starting with the most likely.

Temperature Control Thermostat

If the freezer runs too long the temperature control thermostat might be defective. The thermostat allows power to flow through to the compressor, evaporator fan and condenser fan. Try rotating the temperature control thermostat all the way from stop to stop and listen for a click. If the thermostat clicks it's probably OK. If not, remove it and check it for continuity. It should have continuity when it's calling for cooling.

Evaporator Fan Motor

If the freezer runs too long the evaporator fan motor might have stopped working. On the back wall of the freezer, normally behind a panel which can be removed, there is a small fan. This fan draws air over the evaporator cooling coils and moves it around inside the freezer. If the freezer runs too long, the evaporator fan motor should be checked. Often the fan motor will not run when the door is open, activate the door switch for the fan to work. If the evaporator fan motor doesn't run when the freezer is cooling and the door switch is activated, it should be replaced.

Condenser Fan Motor

The freezer has a condenser fan motor. If the freezer runs too long, the condenser fan motor may have worn out, burned out, or may have something caught in the blades preventing it from spinning. The condenser fan motor draws air over the condenser coils to dissipate the heat which has been removed from the inside of the freezer. The condenser fan motor is accessed from the back side of the freezer, near the bottom. An access panel may have to be removed to service it. The condenser fan motor is relatively inexpensive and easy to replace.

Defrost Timer

If the freezer runs too long, the defrost timer might be defective. Several times a day the defrost timer turns on the defrost heater for a few minutes to melt away any frost that may have accumulated on the freezer evaporator coils. In order for this to work, the defrost timer has to be advancing properly. If the timer is defective it may not advance and 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 to the freezer. The defrost timer should be replaced if it is not advancing, it cannot be repaired.

Defrost Heater Assembly

If the freezer runs too long, the defrost heater assembly might be burned out. Several times a day the defrost heater assembly turns on for a few minutes to melt away any frost that may have accumulated on the freezer evaporator coils. If the defrost heater assembly has burned out, the frost will build up on the coils and eventually no air will be able to travel through the coils to provide cooling to the freezer. The defrost heater can be checked for continuity. If it doesn't have continuity it should be replaced.

Defrost Thermostat

If the freezer runs too long, 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 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 to the freezer. The defrost thermostat can be checked for continuity. It should have continuity when it reaches the low temperature of its operating range.

Main Control Board

If the freezer runs too long, the main control board may be defective. The main control board is often misdiagnosed, so be sure to check for other causes. If the main control board is defective it will have to be replaced, it is not repairable.

Sealed System Leak

When the sealed refrigeration system is working properly there should be a consistent frost pattern on all the evaporator (cooling) coils in the freezer. If only one or two rows contain frost and the rest do not or there is only a small section of frost on the inside cabinet of a chest freezer it is likely that the sealed system has developed a restriction or a leak. Be aware that any repairs to the system can be costly and must be performed by a licensed technician.

Freezer Runs All The Time - Appliance tip of the week-door-key-5303310289-01157235-jpg Freezer or Refrigerator door key, shaped like a plus sign

Freezer Runs All The Time - Appliance tip of the week-door-key-842177-00559518-jpg Key for freezer door - Pentagon shape

Freezer Runs All The Time - Appliance tip of the week-deodorizer-wx10x25-00928034-jpg Smells Begone spray

jeff.