192
TROUBLESHOOTING
12) Communication Failure / Indoor Unit System Failure
Problem Possible Cause Specific Example Inspection and Treatment
AF (30) error Indoor drain failure
Drain system failure
Refer to P232, 58)Check Drain
Water
Humidifier failure
Water supply/drain water system
failure of the humidifier
Check humidifier for water leak
A3 (95) error
Inappropriate drain
water level
Drain pump
operation failure
Drain pump failure
Refer to P232, 59)Inspect
Drain Pump
Output failure
Contact failure / disconnection
Drain float switch failure
Refer to P232, 60)Inspect
Drain Float Switch
Drain pipe failure Rise / Slope
Refer to P232, 58)Check Drain
Water
A6 (15) error
Indoor fan operation
failure
Obstacle (contact with other objects) Clean up obstacle
Indoor fan motor failure
Refer to P224, 41)Inspect In-
door Fan Motor
Indoor fan capacitor failure
Output failure
A7 (35) error
Indoor swing flap
motor operation
failure
Indoor swing flap motor failure
Check indoor swing flap motor
or louver
CA (98) error
Sensor/Harness
system failure
Indoor discharge air
temperature sensor
operation failure
Indoor discharge air temperature
sensor failure
Refer to P231, 56)Check for
Readings of the Indoor Tem-
perature Sensors
Disconnection / Short circuit
CJ (17) error
Sensor/Harness
system failure
Indoor remote
controller sensor
operation failure
Indoor remote controller sensor
failure
Inspect indoor remote controller
sensor
Disconnection / Short circuit
C4 (18) error
Sensor/Harness
system failure
Indoor heat
exchanger liquid
pipe temperature
sensor operation
failure
Indoor heat exchanger liquid pipe
temperature sensor failure Refer to P231, 56)Check for
Readings of the Indoor Tem-
perature Sensors
Connection failure / Disconnection
/ Short circuit
Indoor control PCB
failure
Indoor control PCB failure
Inspect or replace indoor control
PCB
C5 (19) error
Sensor/Harness
system failure
Indoor heat
exchanger vapor
pipe temperature
sensor operation
failure
Indoor heat exchanger vapor pipe
temperature sensor failure Refer to P231, 56)Check for
Readings of the Indoor Tem-
perature Sensors
Connection failure / Disconnection
/ Short circuit
Indoor control PCB
failure
Indoor control PCB failure
Inspect or replace indoor control
PCB
C9 (97) error
Sensor/Harness
system failure
Indoor intake air
temperature sensor
operation sensor
Intake air temperature sensor
failure
Refer to P231, 56)Check for
Readings of the Indoor Tem-
perature Sensors
Connection failure / Disconnection
/ Short circuit
Indoor control PCB
failure
Indoor control PCB failure
Inspect or replace indoor control
PCB
UC (36) error
Indoor unit address
number setting error
Duplicated assignment of the same indoor unit address
number
Check address number setting
Outdoor unit address
number setting error
Duplicated assignment of the same outdoor unit address
number
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