Daikin · Simple Self Diagnosis by Malfunction Code | Daikin
This error indicates a problem with either the room temperature sensor or the damper in the humidifier unit of the indoor system.
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Turn off power to the unit.
Ensure the room temperature sensor is not blocked or dirty.
If your unit has a humidifier, check its damper mechanism for obstructions.
Restore power.
If the error continues, contact a technician.