Skip to main contentStart diagnosing AF on your Daikin heat pump
What this code means
Humidifier or related abnormality – water leakage from humidifier detected based on float switch ON/OFF changeover while system is not operating.
First step from the service manual
Check if humidifier(s) are connected to the system and verify the water drain system of the humidifier is normal.
Next steps: diagnose the root cause
1
Verify the error code is active
Power cycle the unit and see if the code returns. If it does, the fault is persistent and requires diagnosis.
2
Get the full diagnostic procedure
Get step-by-step guidance, test values, and wiring diagrams from the OEM service manual.
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What’s available for Daikin heat pump models
Access Daikin heat pump service manuals, wiring schematics, exploded parts views, and error code references on MyPros+.