What It Means
Malfunction of transmission between remote controllers.
Daikin Fan Coil
Daikin Fan Coil Error Code U8
Troubleshooting guide for the Daikin Fan Coil system fault U8.
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Possible Causes
- Transmission error between main and sub remote controller.
- Connection between sub remote controllers.
- Defective remote controller PCB.
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 transmission between remote controllers
All Recorded Causes
Transmission error between main and sub remote controller Connection between sub remote controllers Defective remote controller PCB
Verify Before Replacing Parts
- Confirm the exact Daikin model family and fan coil context before acting on a generic code description.
- Confirm filter condition, blower operation, and coil cleanliness before replacing any controls — start by ruling out whether transmission error between main and sub remote controller.
- Measure airflow-related readings that match the symptom, such as temperature split or static pressure, and check whether connection between sub remote controllers.
- After the correction, run the system long enough to confirm the fan coil fault does not return under normal load.
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