Indoor unit displays E3 and stops; outdoor unit may not start or may shut down quickly.

Warning: Outdoor units are exposed to weather and mains voltage. Turn off the breaker and verify power is off before opening the outdoor unit.

• 1. Remove outdoor cover: Unscrew and remove the service panel to access the control box and coil area.
• 2. Locate outdoor coil sensor: Find the NTC sensor clipped to the outdoor coil tubing or fins, with two wires leading into the control box.
• 3. Inspect sensor and wiring: Check for broken insulation, corrosion, or a sensor that has come loose from the coil. Re-clip if necessary.
• 4. Check connector: Inside the control box, locate the sensor connector on the outdoor PCB. Reseat the plug and ensure no moisture or corrosion is present.
• 5. Measure resistance (if equipped): Disconnect the sensor and measure resistance at ambient temperature. If reading is open or near zero, replace the sensor.
• 6. Replace sensor: Install a compatible Beko outdoor coil temperature sensor, secure it to the coil, and route wiring away from fan blades and sharp edges.
• 7. Persistent E3: If a known-good sensor still triggers E3, the outdoor PCB is likely faulty and should be replaced by a technician.