Refrigerator display shows F1 and the fresh food compartment is too warm while the freezer may still be cooling.

Safety first: Unplug the refrigerator from the wall outlet before removing panels or handling wiring. Do not work on live circuits.

Step-by-step checks:

• 1. Power reset: Unplug the fridge for 5 minutes, then plug it back in. If F1 clears temporarily and returns, continue with diagnostics.
• 2. Locate the fresh food sensor: Inside the refrigerator compartment, find the small plastic cover on the rear or side wall (often near the top). Remove the cover to access the NTC sensor.
• 3. Inspect wiring: Check the sensor wires for cuts, pinches, or signs of moisture damage. Ensure the connector is fully seated.
• 4. Test the sensor: With the fridge unplugged, disconnect the sensor and measure its resistance using a multimeter. At about 25°C (77°F), most NTC sensors read roughly 5–10 kΩ (check your model’s service sheet if available). If the reading is open (OL) or shorted (near 0 Ω), the sensor is faulty.
• 5. Replace the sensor: If defective, remove the old NTC thermistor and install a new OEM sensor for your specific Ikea refrigerator model. Route the wires as originally installed and secure the cover.
• 6. Check the control board: If the sensor tests good, remove the rear access panel and inspect the main control board for burnt spots or corroded connectors on the sensor input. Reseat the plug and try again. If F1 persists, the board may need replacement.

When to call a technician: If you are not comfortable testing resistance or accessing the main control board, or if the board appears damaged, contact a qualified appliance technician.