SiBE121135_A Troubleshooting for SA Indoor Unit
Service Diagnosis 194
6.5 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
When 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?
NO
YES
YES
NO
NO
NO
YES
YES
Check the water drain
system.
Check to see if the drain-up
height and the horizontal
pipe length exceed the
specifications.
Faulty trap in the water
drain system
Replace the indoor unit
PCB.
(R13752)
Check the jumper
connector.
Check the drain pump and
the drain pipe.
Is a drain-up kit installed?
Is the drain pump
normal?
Is
the amount of
circulated drain water
excessive after the pump
stops operation?
Does the
drain water flow in
reverse while the indoor unit
is not operating?
∗ In FHQ, problems can also occur in
the optional drain pump.
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