Sub-Zero Air Damper or Refrigerator Evaporator Airflow Restriction

Refrigerator section warm while freezer is cold; fresh food compartment not reaching set temperature.

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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

Stuck or failed refrigerator air damper, Ice buildup around damper, Blocked air vents by food items, Failed refrigerator evaporator fan motor

How to Fix / Troubleshooting

Safety first: Disconnect power before removing interior panels or working near fans.

Step 1 – Check airflow paths

  • Ensure large containers or boxes are not blocking the air vents in the refrigerator section.
  • Feel for cold air coming from the damper vent when the compressor is running; there should be a noticeable flow.

Step 2 – Inspect the air damper

  • Locate the air damper assembly (often at the top or rear of the fresh food compartment).
  • Remove the cover and check for ice or debris preventing the damper door from opening.
  • With power restored briefly, observe if the damper motor moves when temperature is adjusted colder.

Step 3 – Clear ice and test fan

  • If ice is present, unplug the unit and allow it to melt, or carefully thaw with a hair dryer on low.
  • Verify that the refrigerator evaporator fan is running; if not, test and replace the evaporator fan motor as needed.

Step 4 – Replace damper if failed

  • If the damper does not move or is noisy/broken, replace the damper assembly with an OEM Sub‑Zero part.
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Repair Difficulty

Medium 3/5

Required Part

Refrigerator Air Damper Assembly
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