Service Manual

Troubleshooting for FFQ Series SiUS121502E
130 Service Diagnosis
6.4 Drain System Abnormality
Error Code
AF
Method of Error
Detection
Water leakage is detected based on the float switch ON/OFF changeover while the compressor is
not operating.
Error Decision
Conditions
The float switch changes from ON to OFF while the compressor is OFF.
Supposed
Causes

Error in the drain pipe installation

Defective float switch

Defective indoor unit PCB
Troubleshooting
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. Check if the drain-up
height and the horizontal
pipe length exceed the
specifications.
(R16022)
Are
the float switch and
the drain pipe
normal?
Is the
water drain system
normal?