Auto Defrost Freezer Not Working

The defrost timer is such that either the compressor or the defrost heater is on but not both at the same time.

Auto defrost freezer not working.

To begin with it will seem like the freezer is ok but the fresh food section will start to fail. In most cases the problem is a defective defrost timer. You can use volt ohm meter to check the defrost sensor for continuity. If the refrigerator has a defrost problem and will not melt the ice it eventually builds up to the point that it blocks airflow.

If the defrost sensor fails to shut off the defrost heater the fuse will blow in order to shut off the defrost heater. The defrost sensor has a fuse to back up the sensor in case the sensor fails. The normal freezer temperature is between 0ºf and 5ºf. The freezer s set temperature is correct.

Move on to the next step if this does not resolve the defrosting issue. The fuse will blow in order to shut off the defrost heater. When the coils are covered by too much frost and ice airflow is restricted and the freezer won t efficiently cool food. The defrost sensor monitors the temperature of the evaporator.

If the defrost sensor trips because it s not working correctly frost builds up on the evaporator fins eventually making the refrigerator and freezer not cool well. It can take up to a month to get to this point. A defrost thermostat opens the heater circuit when the evaporator temperature rises above a preset temperature 40 f 5 c or more thereby preventing excessive heating of the freezer compartment. The automatic defrost should now work if there is no other issues with the defrost system.

5 check if the defrost timer defrost heater and the thermostat are working correctly. If any of them fails to function the defrost system will not function. The defrost thermostat needs to be replaced if its contacts aren t properly functioning. If the problem is not resolved the freezer will start to thaw as well.

If the defrost sensor fails to shut off the defrost heater. The defrost heater assembly turns on several times throughout the day to melt away any frost that may have accumulated on the evaporator coils. It requires the owner to manually defrost the freezer coils as frost builds up. Ice buildup in the freezer cabinet is an indication that the auto defrost system is not working.

If the defrost sensor fuse blows the defrost system will not work and the refrigerator will not defrost. Replace the defrost sensor if it shows no continuity at around 0 degrees f. Here are some things to check for if the freezer is running too warm but the refrigerator section is maintaining the desired temperature. If the defrost timer is not advancing replace it.

A manual defrost freezer does not contain any automatic heating elements to prevent the build up of frost or ice.