Thermador Evaporator Frost Buildup / Airflow Restriction

Refrigerator not cooling in fresh food section but freezer is cold; no error code displayed.

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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

Defective defrost heater, Failed defrost thermostat, Faulty defrost control on main board, Iced-over air ducts between freezer and refrigerator

How to Fix / Troubleshooting

Safety first: Unplug the refrigerator before removing interior panels. Avoid using sharp tools to remove ice.

Steps to check:

  • Inspect evaporator: Remove the freezer rear panel. If the evaporator coil is completely encased in ice, the defrost system is not working.
  • Manual defrost: Defrost the coil using a hair dryer on low or by leaving the unit unplugged with doors open for 24 hours. Protect floors from water.
  • Test defrost components: After defrosting, test the defrost heater and thermostat for continuity. Replace any open components with Thermador-approved parts.
  • Monitor operation: Reassemble and run the unit. If frost quickly returns, the main control board may not be initiating defrost and should be checked by a technician.
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Repair Difficulty

Medium 3/5

Required Part

Defrost Heater Assembly
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