What It Means
Malfunction of suction air thermistor.
Daikin Split & Multi-Split
Daikin Split & Multi-Split Error Code C9
Troubleshooting guide for the Daikin Split & Multi-Split system fault C9.
Possible Causes
- Defective thermistor for suction air.
- Defective indoor unit PCB.
- Defective connector contact.
Not sure which one it is — or if it's none of these? Try ACLogics today.
Disclaimer: This information is for general reference. Error codes can vary by model and production year. Always refer to your machine's specific manual and the information printed on the unit itself.
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Full Diagnosis
Malfunction of suction air thermistor
All Recorded Causes
Defective thermistor for suction air Defective indoor unit PCB Defective connector contact
Verify Before Replacing Parts
- Confirm the exact Daikin model family and split/ multi split context before acting on a generic code description.
- Verify the sensor or thermistor reading against the expected range for the current operating condition, keeping in mind that defective thermistor for suction air.
- Check the sensor harness and board connection before condemning the sensor itself; on Daikin units this is also where you'd confirm defective indoor unit PCB.
- After the correction, run the system long enough to confirm the split/ multi split fault does not return under normal load.
Still unsure about this fault?
ACLogics walks you through Daikin Split & Multi-Split diagnostics step-by-step — so you confirm the cause before swapping parts.
