E3
AEG
Outdoor Coil Temperature Sensor Fault
Outdoor unit does not start; indoor unit may run fan only and display E3.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failed outdoor condenser NTC sensor, Sensor wiring damaged by weather or rodents, Loose connector on outdoor PCB, Faulty outdoor PCB sensor circuit
How to Fix / Troubleshooting
Safety: Turn off the outdoor isolator or main breaker. Outdoor units contain high voltage and moving parts.
- Access outdoor unit: Remove the service panel on the outdoor AEG unit.
- Locate coil sensor: Find the sensor clipped to the condenser coil or inserted into a small tube on the coil. It will have two small wires leading to the outdoor PCB.
- Check physical condition: Ensure the sensor is intact, not cracked, and firmly attached to the coil. Check that the cable insulation is not brittle or chewed.
- Inspect connector: Reseat the sensor connector on the outdoor PCB. Look for corrosion or water ingress around the plug.
- Test sensor: If you have a multimeter, disconnect the sensor and measure resistance. Compare to expected NTC values (often 5–20 kΩ at 25°C). Replace if open or shorted.
- Replace sensor: Fit a compatible AEG outdoor coil temperature sensor. Clip or insert it in the same location and secure the cable.
- If E3 persists: The outdoor PCB may be defective. Due to live mains and compressor control circuits, contact an authorised AEG service technician.
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Repair Difficulty
Hard
4/5
Required Part
Outdoor Coil Temperature Sensor (NTC)
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