What It Means
High pressure control in heating, freeze-up protection control in cooling.
Daikin Packaged Unit
Daikin Packaged Unit Error Code A5
Troubleshooting guide for the Daikin Packaged Unit system fault A5.
Possible Causes
- Clogged air filter of indoor unit and short circuit.
- Defect of indoor unit heat exchanger thermistor.
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
High pressure control in heating, freeze-up protection control in cooling
All Recorded Causes
Clogged air filter of indoor unit and short circuit Defect of indoor unit heat exchanger thermistor
Verify Before Replacing Parts
- Confirm the exact Daikin model family and packaged context before acting on a generic code description.
- Verify airflow first, then confirm operating pressures and temperature relationship before adjusting charge, since clogged air filter of indoor unit and short circuit.
- Look for restrictions, iced coils, or dirty heat-transfer surfaces that can mimic a charge problem, and separately confirm defect of indoor unit heat exchanger thermistor.
- After the correction, run the system long enough to confirm the packaged fault does not return under normal load.
Still unsure about this fault?
ACLogics walks you through Daikin Packaged Unit diagnostics step-by-step — so you confirm the cause before swapping parts.
