SiUS121632EA Troubleshooting for FFQ Series
Service Diagnosis 151
6.4 Humidifier or Related Abnormality
Error Code
AF
Method of Error
Detection
Water leakage from humidifier(s) is detected based on the float switch ON/OFF changeover while
the system is not operating.
Error Decision
Conditions
The float switch changes from ON to OFF while the system is OFF.
Supposed
Causes
Defective float switch
Error in water drain system of humidifier(s)
Clogged electric expansion value in humidifier(s)
Defective indoor unit PCB
Troubleshooting
Note: The system continues to operate with the thermostat OFF even while the error code is displayed.
YES
YES
NO
NO
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
The float switch may be
defective. Check if the
drain-up height and the
horizontal pipe length
exceed the specifications.
Clogged water drain
system, clogged drain
pump, or faulty float switch
Replace the indoor unit
PCB (control PCB).
(R24055)
Humidifier(s)
connected to the
system?
Is the
water drain system of
the humidifier normal?
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