157
TROUBLESHOOTING
Error
frequency
until error
display
Display
Treatment
Method of diagnosis / repair
Possible major causes Diagnosis / Repair
※1 ※2
1 Alert Z N 1. Connector contact failure
2. Indoor remote controller sensor failure
3. Harness disconnection or short circuit
1. Check connector connection
2. Inspect indoor remote controller sensor
1 Error X N 1. Indoor fan PCB failure
2. Connector connection failure
3. Indoor control PCB failure
1. Inspect or replace indoor fan PCB
2. Check connector connection
3. Inspect or replace indoor control PCB
1 Error X N 1. Connector connection failure
2. Indoor heat exchanger liquid pipe tem-
perature sensor failure
3. Harness disconnection or short circuit
4. Indoor control PCB failure
1. Check connector connection
2. Inspect indoor heat exchanger liquid
pipe temperature sensor (Refer to
P231, 56)Check for Readings of the
Indoor Temperature Sensors)
3. Inspect or replace indoor control PCB
1 Error X N 1. Connector connection failure
2. Indoor heat exchanger vapor pipe
temperature sensor failure
3. Harness disconnection or short circuit
4. Indoor control PCB failure
1. Check connector connection
2. Inspect indoor heat exchanger vapor
pipe temperature sensor (Refer to
P231, 56)Check for Readings of the
Indoor Temperature Sensors)
3. Inspect or replace indoor control PCB
1 Error X N 1. Indoor fan PCB failure
2. Capacity setting adaptor contact failure
3. Field setting error
1. Inspect or replace indoor fan PCB
2. Check for connector of capacity setting
adaptor
3. Check field setting
1 Error X N 1. Connector connection failure
2. Indoor intake air temperature sensor
failure
3. Harness disconnection or short circuit
4. Indoor control PCB failure
1. Check connector connection
2. Inspect indoor intake air temperature
sensor (Refer to P231, 56)Check for
Readings of the Indoor Temperature
Sensors)
3. Inspect or replace indoor control PCB
10 in a row Error B N 1. Reversing valve failure
2. Inadequate refrigerant
1. Refer to P227, 49)Inspect Reversing
Valve
2. Refer to P222, 36)Inspect Refrigerant
Pressure (Inspect Refrigerant
Amount)
2/15 minutes Error A B 1. Engine coolant circulation failure.
(Inadequate engine coolant.)
2. Engine coolant temperature sensor
failure
3. Harness of engine coolant temperature
sensor short circuit
4. Engine heat dissipation failure, etc.
Refer to P186, 4)Engine Coolant Tem-
perature Abnormality
1
3 in a row Error B B 1. Connector of engine coolant tempera-
ture sensor contact failure
2. Engine coolant temperature sensor
failure
3. Harness of engine coolant temperature
sensor disconnection
4. Thermostat failure
1. Check for connector of engine coolant
temperature sensor connection
2. Refer to P218, 28)Inspect Engine
Coolant Temperature Sensor
3. Refer to P216, 25)Inspect Thermostat
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