Symptoms
- Fridge section feels normal or cool
- Freezer section feels warm or food is thawing
- Heavy frost visible on the back wall of the freezer
- Fan may be silent when it should be running
Likely causes
- CommonEvaporator coil frosted overIf the automatic defrost cycle fails, ice builds up on the coil and blocks airflow into the freezer.
- CommonFailed defrost heater, thermostat, or timerAny part of the defrost system failing lets frost accumulate until it blocks the coil.
- PossibleEvaporator fan not runningWithout the fan pushing cold air, the freezer warms even if the compressor is fine.
- PossibleDoor not sealing letting warm air inA bad seal on the freezer door accelerates frost buildup and warming.
- Less commonFailing compressor or sealed system leakIf defrost components are fine and there is no frost blockage, the compressor may not be cooling properly.
What to do
- Unplug the unit and check the back wall of the freezer for a thick layer of frost or ice blocking the vents.
- If frosted, let it fully defrost for several hours with the door open and towels underneath.
- Once defrosted, plug back in and listen for the evaporator fan running near the back wall.
- Check the door gasket for gaps that could be letting in warm, moist air.
- If the coil frosts over again within a week or two, the defrost heater, thermostat, or timer likely needs replacement.
- If there's no frost blockage but the freezer stays warm, have a technician check the compressor and refrigerant system.
Tools and parts
- Towels
- Thermometer
Defrost heater assemblySearch: “refrigerator defrost heater kit”
Defrost thermostatSearch: “refrigerator defrost thermostat”
When to call a pro
If frost keeps returning after a manual defrost, an appliance technician should replace the defrost heater, thermostat, or timer.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.