F9
Tosot
Indoor Coil Outlet Temperature Sensor Fault
Indoor unit shows F9, irregular temperature control or shutdowns
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Possible Causes
Defective outlet temperature sensor on indoor coil, Sensor not properly attached, Wiring harness damage, Indoor PCB sensor circuit failure
How to Fix / Troubleshooting
Safety first: Turn off power before removing covers.
- Locate outlet sensor: This sensor is typically clipped to the outlet side of the indoor evaporator coil.
- Check attachment and wiring: Ensure it is firmly attached and the wires are intact. Reseat the connector on the PCB.
- Replace sensor: If F9 persists, replace the outlet temperature sensor with the correct Tosot part.
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Repair Difficulty
Easy
2/5
Required Part
Indoor Coil Outlet Temperature Sensor
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