![background image](http://html.mh-extra.com/html/daikin/fdmq12rvju/fdmq12rvju_service-manual_501418148.webp)
Troubleshooting for FDMQ Series
SiUS091601EA
143
Part 6 Service Diagnosis
Note
6.5 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
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?
Summary of Contents for FDMQ12RVJU
Page 18: ...SiUS091601EA 13 Part 2 Specifications 1 Specifications 14 Part 2 Specifications ...
Page 198: ...Check SiUS091601EA 193 Part 6 Service Diagnosis 18 24 class R24538 1 2 3 4 Multimeter ...
Page 201: ...SiUS091601EA Check Part 6 Service Diagnosis 196 18 24 class R24539 DC DC W V U ...
Page 229: ...SiUS091601EA Piping Diagrams Part 8 Appendix 224 RXL15QMVJU RXL18UMVJU 3D100007 3D123368 ...
Page 230: ...Piping Diagrams SiUS091601EA 225 Part 8 Appendix RXL24UMVJU 3D107985A ...