Refrigerator display shows E0 and cooling performance is reduced or erratic.

Safety first: Unplug the refrigerator from the wall outlet before removing any panels or touching wiring. Use insulated tools and avoid working with wet hands.

Step-by-step checks:

• 1. Power reset: Unplug the unit for 5–10 minutes, then plug it back in. If E0 clears and does not return, it may have been a temporary logic fault.
• 2. Locate the refrigerator sensor: The Haier refrigerator (cabinet) NTC sensor is usually clipped to the liner wall behind a small plastic cover or inside an air channel in the fresh-food compartment. Remove shelves as needed and gently pry off the cover.
• 3. Inspect the sensor and wiring: Check for broken, pinched, or chewed wires, loose connectors, or signs of moisture intrusion. Reseat the connector firmly.
• 4. Test the sensor: With the unit unplugged, disconnect the sensor from the harness and measure resistance with a multimeter. At around 25°C (77°F), most Haier NTC sensors read roughly 5–10 kΩ (exact value varies by model). If the reading is open (OL), near 0 Ω, or wildly out of range compared to spec in the service manual, the sensor is faulty.
• 5. Check continuity to the main PCB: If the sensor tests good, check continuity from the sensor connector to the main control board connector. Repair any broken or high-resistance wires.
• 6. Replace parts as needed: If the sensor is defective, replace it with a Haier-compatible refrigerator temperature sensor (NTC). If wiring and sensor are good but E0 persists, the main control board (PCB) may need replacement. Label and transfer all connectors one by one to avoid miswiring.

When to call a technician: If you are not comfortable testing resistance or accessing the main PCB, or if replacing the sensor does not clear the error, contact a qualified appliance technician.