161
TROUBLESHOOTING
Error
frequency
until error
display
Display
Treatment
Method of diagnosis / repair
Possible major causes Diagnosis / Repair
※1 ※2
1 Error C B 1. Connector of fan motor contact failure
2. Fan motor failure
3. Harness of fan motor disconnection or
short circuit
4. Outdoor control PCB failure
1. Check connector of fan motor connec-
tion
2. Refer to P217, 27)Inspect Outdoor Fan
Motor
6 in a row Warning F N
Warning F N
1 Warning F N
Warning F N
2 in a row Error A B 1. Connector of oil pressure switch contact
failure
2. Oil pressure switch failure
3. Harness of oil pressure switch discon-
nection or short circuit
4. Low oil pressure
5. Noise or other causes
1. Check for connector of oil pressure
switch connection
2. Refer to P186, 5)Oil Pressure Abnor-
mality
1 Error B N 1. Connector of oil level switch connection
failure
2. Oil level switch failure
3. Harness of oil level switch disconnection
or short circuit
4. Engine oil leakage
1. Check for connector of oil level switch
connection
2. Refer to P186, 5)Oil Pressure Abnor-
mality
2/60 minutes Error B N 1. Condenser heat dissipation failure
2. Refrigerant system blockage or leakage,
etc.
3. Inadequate refrigerant oil
1. Refer to P190, 10)Overheated Refrig-
erant Discharge Temperature in Cool-
ing Operation
2. Check refrigerant oil amount and
leakage
1 Error A B 1. Connector of engine exhaust air temper-
ature sensor contact failure
2. Engine exhaust air temperature sensor
failure
3. Harness of engine exhaust air tempera-
ture sensor disconnection or short circuit
4. Clogged deodorizing catalyst
1. Check for connector of engine exhaust
air temperature sensor connection
2. Refer to P228, 52)Check for Readings
of the Engine Exhaust Air Tempera-
ture Sensor
3. Check deodorizing catalyst
2/15 minutes
6/24 minutes
Error A B 1. Connector of compressor discharge pipe
temperature sensor contact failure
2. Compressor discharge pipe temperature
sensor failure
3. Harness of compressor discharge pipe
temperature sensor short circuit
4. Inadequate refrigerant / Blockage in
refrigerant system / Compressor
compression failure
5. Condenser heat dissipation failure
6. Entry of non-condensable gas
1. Check for connector of compressor
discharge pipe temperature sensor
connection
2. Refer to P190, 10)Overheated Refrig-
erant Discharge Temperature in Cool-
ing Operation
3. Refer to P191, 11)Overheated Refrig-
erant Discharge Temperature in Heat-
ing Operation
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