Freezer cold but refrigerator section warm, ice buildup on back wall of freezer.

Safety first: Unplug the refrigerator and remove food that may spoil.

Manual defrost:

• Open the freezer door and remove shelves and drawers.
• Remove the rear freezer panel to expose the evaporator coil.
• Use towels to catch water and a hair dryer on low to melt heavy frost. Do not use sharp tools.

• Check evaporator fan: After ice is cleared, spin the fan by hand to ensure it moves freely. Replace the Insignia evaporator fan motor if seized or noisy.
• Inspect defrost components: Check the defrost heater and thermostat for continuity as described in the E4 scenario. Replace any open components.
• Verify air vents: Ensure vents between freezer and refrigerator are not blocked by food or ice.
• Reassemble and monitor: Reinstall panels and shelves, restore power, and monitor temperatures over 24–48 hours.

Note: If frost quickly returns, the automatic defrost system or control board may still be faulty and require professional diagnosis.