What It Means
Shortage of refrigeran.
Daikin Split & Multi-Split
Daikin Split & Multi-Split Error Code U0
Troubleshooting guide for the Daikin Split & Multi-Split system fault U0.
Possible Causes
- Refrigerant shortage and refrigerant clogging (wrong piping).
- Defective thermistor.
- Defective low pressure sensor.
- Defective outdoor unit main 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
Shortage of refrigeran
All Recorded Causes
Refrigerant shortage and refrigerant clogging (wrong piping) Defective thermistor Defective low pressure sensor Defective outdoor unit main PCB
Verify Before Replacing Parts
- Confirm the exact Daikin model family and split/ multi split context before acting on a generic code description.
- Verify airflow first, then confirm operating pressures and temperature relationship before adjusting charge, since refrigerant shortage and refrigerant clogging (wrong piping).
- Look for restrictions, iced coils, or dirty heat-transfer surfaces that can mimic a charge problem, and separately confirm defective thermistor.
- 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.
