Ikea Evaporator Frost Blockage / Defrost System Failure

Refrigerator not cooling in fresh food compartment but freezer seems cold or frosty.

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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

Failed defrost heater, Defective defrost thermostat, Faulty defrost control on main board, Blocked air ducts between freezer and fridge section

How to Fix / Troubleshooting

Safety: Unplug the refrigerator before removing interior panels. Do not use sharp tools to remove ice.

Steps:

  • 1. Check airflow: Feel for cold air coming from vents in the fresh food compartment. Weak or no airflow suggests frost blockage.
  • 2. Inspect freezer back panel: Look for heavy frost or ice buildup on the inside rear wall of the freezer. This indicates a defrost problem.
  • 3. Manual defrost: Unplug the unit and leave doors open for 12–24 hours with towels to catch water. This will temporarily restore cooling if the defrost system is the issue.
  • 4. Test defrost components: After defrosting, access the evaporator, heater, and thermostat (see defrost heater fault). Replace any failed components with Ikea-compatible parts.
  • 5. Control board: If heater and thermostat are good, the main control board may not be initiating defrost and may need replacement.

Tip: If the problem recurs every 1–2 weeks, the automatic defrost system is not working correctly and must be repaired, not just manually defrosted.

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Repair Difficulty

Hard 4/5

Required Part

Defrost Heater Assembly
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