155
TROUBLESHOOTING
Error
frequency
until error
display
Display
Treatment
Method of diagnosis / repair
Possible major causes Diagnosis / Repair
※1 ※2
1 Warning Z N 1. Drain system failure
2. Water supply/drain water system failure
of the humidifier
3. Indoor control PCB failure
1. Refer to P232, 58)Check Drain Water
2. Check humidifier for water leak
3. Inspect or replace indoor control PCB
1 Warning Z N 1. Connector contact failure
2. Indoor dust collector failure
3. Indoor control PCB failure
1. Check connector connection
2. Inspect indoor dust collector
3. Inspect or replace indoor control PCB
1 Error X N 1. Indoor unit capacity setting error
2. Indoor control PCB failure
1. Check indoor unit capacity setting
2. Inspect or replace indoor control PCB
1 Error B N 1. An emergency stop call from the indoor
unit
2. Remote controller field setting error
3. Indoor control PCB failure
1. Check for an emergency stop call from
the indoor unit
2. Check remote controller setting
3. Inspect or replace indoor control PCB
1 Error X N Indoor control PCB failure Inspect or replace indoor control PCB
1 Error X N 1. Connector of drain float switch contact
failure
2. Drain float switch failure
3. Check drain pipe
4. Connector of drain pump disconnection
5. Drain pump failure
6. Harness of drain pump disconnection
1. Check connector connection
2. Check for inverse inclination and rising
height of piping
3. Refer to P192, 12)Communication
Failure / Indoor Unit System Failure
1 Error X N 1. Contact with other objects
2. Indoor fan failure
3. Indoor fan motor failure
4. Indoor control PCB failure
5. Indoor fan PCB failure
1. Clean up objects
2. Refer to P192, 12)Communication
Failure / Indoor Unit System Failure
3. Inspect or replace indoor control PCB
4. Inspect or replace indoor fan PCB
1 Alert Z N 1. Connector contact failure
2. Indoor swing flap motor or louver failure
3. Indoor control PCB failure
1. Check connector connection
2. Check for indoor swing flap motor or
louver
3. Inspect or replace indoor fan PCB
1 Error X N Indoor power supply or power supply circuit
failure
Inspect indoor power supply or power
supply circuit
1 Error B, E N 1. Connector contact failure
2. Indoor electronic expansion valve failure
3. Indoor control PCB failure
1. Check connector connection
2. Refer to P224, 42)Inspect for Block-
age in the Indoor Electronic Expan-
sion Valve
3. Inspect or replace indoor fan PCB
1 Error X N 1. Connector contact failure
2. Indoor discharge air temperature sensor
failure
3. Harness disconnection or short circuit
1. Check connector connection
2. Inspect indoor discharge air temperature
sensor (Refer to P231, 56)Check for
Readings of the Indoor Temperature
Sensors)
1 Warning Z N 1. Connector contact failure
2. Indoor human detection · floor tempera-
ture sensor failure
3. Harness disconnection or short circuit
1. Check connector connection
2. Inspect human detection · floor tempera-
ture sensor
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