F9
Chigo
Indoor Humidity or Secondary Sensor Fault (model-dependent)
Indoor unit shows F9 and unit may not respond correctly to set temperature; erratic operation.
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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 auxiliary NTC sensor on Chigo indoor PCB, Loose sensor connector, Damaged sensor wiring
How to Fix / Troubleshooting
Safety first: Disconnect power before accessing the indoor PCB.
- Step 1 – Identify the F9 sensor: Refer to the service manual for your specific Chigo model to locate the auxiliary sensor (humidity or secondary temperature).
- Step 2 – Check connections: Ensure the sensor plug is firmly seated on the indoor PCB.
- Step 3 – Inspect wiring: Look for pinched or cut wires and repair as needed.
- Step 4 – Replace sensor: If resistance readings are abnormal, replace the auxiliary indoor sensor with the correct part number.
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Repair Difficulty
Medium
3/5
Required Part
Auxiliary Indoor Sensor
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