JennAir
Evaporator Frost Accumulation
Frost or ice buildup on the back wall of the freezer.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Defrost heater failure, Defrost thermostat/thermistor failure, Faulty defrost control on main board, Door gasket leak allowing moist air in
How to Fix / Troubleshooting
Safety first: Unplug the refrigerator before removing freezer panels. Use towels to catch melting ice.
- Manual defrost: Remove food from the freezer and unplug the unit. Leave the door open for 24–48 hours or use a hair dryer on low to melt ice (do not overheat plastic).
- Inspect defrost components: With the rear panel removed, test the defrost heater and defrost thermostat/thermistor for continuity. Replace any failed components.
- Check door gasket: Inspect the freezer door gasket for gaps or tears that allow moist air in. Replace if damaged.
- Control board: If heater and thermostat are good, the main control board may not be initiating defrost and should be diagnosed by a technician.
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Repair Difficulty
Hard
4/5
Required Part
Defrost Thermostat
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