F2
Airwell
Outdoor Ambient Temperature Sensor Fault
Indoor unit shows F2; system may shut down in heating mode or not start heating.
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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
Defective outdoor ambient NTC sensor, Sensor displaced from mounting point, Broken sensor wiring, Faulty outdoor PCB
How to Fix / Troubleshooting
Safety: Turn off power at the breaker before opening the outdoor unit.
Steps:
- 1. Locate ambient sensor: On Airwell outdoor units, the ambient sensor is usually mounted near the air intake grille or on a bracket away from the coil, exposed to outdoor air.
- 2. Inspect mounting: Ensure the sensor is not touching hot surfaces and is positioned in free air. Reposition if necessary.
- 3. Check wiring: Follow the sensor cable to the PCB. Look for damage or loose connectors. Reseat the plug.
- 4. Test resistance: With power OFF, disconnect and measure the sensor resistance. Compare with expected NTC values at current temperature. Replace if readings are abnormal.
- 5. Replace sensor: Install a compatible Airwell outdoor ambient sensor. Secure it in the original location and route the cable neatly.
- 6. PCB evaluation: If the sensor is good and wiring intact, the outdoor PCB may be misreading the sensor and need replacement.
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Repair Difficulty
Medium
3/5
Required Part
Outdoor Ambient Temperature Sensor (NTC)
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