F3
Sencor
Outdoor Ambient Temperature Sensor Fault
Display shows F3, unit may stop heating or cooling correctly.
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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
Open or shorted outdoor ambient NTC sensor, Sensor dislodged from mounting point, Damaged sensor wiring, Faulty outdoor PCB sensor circuit
How to Fix / Troubleshooting
Safety first: Isolate power at the breaker before opening the outdoor unit.
- Step 1 – Locate sensor: In Sencor split systems, the outdoor ambient sensor is usually clipped near the air intake of the outdoor unit, away from the coil.
- Step 2 – Inspect sensor and wires: Ensure the sensor probe is intact and wires are not cut or weather-damaged.
- Step 3 – Check connector: Reseat the sensor connector on the outdoor PCB and look for corrosion.
- Step 4 – Resistance test: With power off, measure sensor resistance and compare to expected NTC values at current outdoor temperature. Replace if open or shorted.
- Step 5 – Replace sensor: Install a new Sencor outdoor ambient sensor and secure it in the same location.
- Step 6 – PCB replacement: If F3 persists with a known-good sensor, the outdoor PCB may be defective and should be replaced by a professional.
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Repair Difficulty
Hard
4/5
Required Part
Outdoor Ambient Temperature NTC Sensor
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