Refrigerator display shows E1 and the fridge compartment is too warm while the freezer may still be cold.

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

Step-by-step checks:

• 1. Power reset: Disconnect power for 5–10 minutes, then reconnect. If E1 returns after a few minutes, continue with diagnosis.
• 2. Locate the fridge NTC sensor: On most CDA built-in and freestanding fridges, the fridge temperature sensor is clipped behind the rear liner of the fridge compartment, often near the air inlet or light housing. Remove the internal shelves and the plastic cover to access it.
• 3. Inspect the sensor and wiring: Check for broken insulation, corrosion on the connector, or a loose plug where the sensor harness connects to the cabinet wiring. Reseat the connector firmly.
• 4. Test the sensor (if you have a multimeter): With the sensor unplugged, measure resistance across the two sensor leads. A typical CDA NTC at ~20°C will read around 5–10 kΩ (exact value varies by model). If it reads open (infinite) or near 0 Ω, the sensor is faulty.
• 5. Replace the sensor if defective: Order a compatible CDA fridge compartment NTC sensor using the model number from the rating plate. Clip the new sensor into the original position and reconnect the harness.
• 6. If the sensor tests OK: Trace the harness back towards the main control PCB (usually at the rear, behind a lower cover). Look for pinched or damaged wires. If wiring is intact and E1 persists, the main control PCB may not be reading the sensor correctly and may require replacement by a qualified technician.

When to call a professional: If you are not comfortable testing resistance or accessing the main PCB, or if replacing the sensor does not clear E1, contact a CDA-authorized service engineer.