F1
Sharp
Outdoor Ambient Temperature Sensor Fault
Indoor unit shows F1; cooling performance is poor or erratic.
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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 thermistor, Disconnected sensor harness, Corroded connector at outdoor PCB, Faulty outdoor PCB sensor input
How to Fix / Troubleshooting
Safety first: Turn off the outdoor unit breaker before opening the service panel.
- Locate the sensor: The outdoor ambient thermistor is usually mounted near the outdoor coil or on the chassis, exposed to outside air, with two small wires leading to the PCB.
- Check mounting and wiring: Ensure the sensor is securely fixed and wires are not cut or pinched. Reseat the connector on the outdoor PCB.
- Resistance test: With power off and sensor disconnected, measure resistance and compare to Sharp’s temperature–resistance chart. Replace the sensor if readings are out of range.
- PCB fault: If a new sensor does not clear F1, the outdoor PCB sensor circuit may be defective and the board will need replacement.
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Repair Difficulty
Medium
3/5
Required Part
Outdoor Ambient Temperature Thermistor
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