Humidifier Or Related Abnormality - Daikin 4MXS-R Series Service Manual

SiUS121736EA
6.5

Humidifier or Related Abnormality

AF
Error Code
Method of Error Water leakage from humidifier(s) is detected based on the float switch ON/OFF changeover while
Detection the system is not operating.
Error Decision The float switch changes from ON to OFF while the system is OFF.
Conditions
Supposed
Causes
Troubleshooting
Note: The system continues to operate with the thermostat OFF even while the error code is displayed.
Service Diagnosis
Defective float switch
Error in water drain system of humidifier(s)
Clogged electric expansion value in humidifier(s)
Defective indoor unit PCB
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Humidifier(s)
connected to the
system?
YES
Is the
water drain system of
the humidifier normal?
YES
NO
NO
Troubleshooting for SA Indoor Unit
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)
170