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Troubleshooting by Error Codes
SiUS281811EA
236
Part 6 Service Diagnosis
4.17 Drain Level Above Limit
Error Code
AF
Applicable
Models
FCQ-TA, FBQ-P
Method of Error
Detection
Water leakage is detected based on float switch ON/OFF operation while the compressor is not in
operation.
Error Decision
Conditions
When The float switch changes from ON to OFF while the compressor is not in operation.
∗
Error code is displayed but the system operates continuously.
Supposed
Causes
Error in the drain pipe installation
Defective float switch
Defective indoor unit PCB
Defective connector connection
Defective drain pump
Troubleshooting
NO
YES
NO
NO
YES
Check the drain pump piping.
Check the drain water discharge
system.
Check if drain-up height and
horizontal pipe length exceed
specifications.
The trap of the drain water
discharge system is not installed
correctly.
Replace the indoor unit control
PCB(A1P).
NO
Check the connector X15A.
YES
YES
Is the drain
pump kit
connected ?
Is the
drain pump
normal ?
Is the
quantity of
condensed water after
the drain pump is
stopped too
much ?
Does
drain water flow
backwards while
drain pump is
stopped ?
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
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