169
TROUBLESHOOTING
Error frequen-
cy until error
display
Display
Treatment
Method of diagnosis / repair
Possible major causes Diagnosis / Repair
※1 ※2
3 in a row Error B B 1. Intake and exhaust air system failure
2. Ignition system failure
3. Compression system failure
4. Noise or other causes
1. Check connector connection
2. Refer to P184, 2)Engine will not Start
3/15 minutes Error B B Stepping motor operation failure, etc. Refer to P187, 6)Over Speed
3/15 minutes Error B B
1 - B N 1. Connector of I/F PCB contact failure
2. Power for outdoor unit is OFF
(power failure, open phase)
3. I/F microcomputer resetting due to noise
or other effect
1. Check connector of I/F PCB contact
2. Refer to P198, 1)Check Power Supply
System
1 - B N Power for indoor unit is OFF
(power failure, open phase)
Refer to P198, 1)Check Power Supply
System
1 - B N 1. Power for indoor unit is OFF
(power failure, open phase)
2. Power supply failure of power supplying
master unit
3. I/F PCB failure
4. Communication wire between indoor and
outdoor units disconnection or short
circuit
5. Communication failure caused by noise
or other effect
1. Refer to P198, 1)Check Power Supply
System
2. Check wiring path
3. Inspect or check I/F PCB
4. Check for communication wire between
indoor and outdoor units
5. Shield signal wire
1 Error E N The capacity of connected indoor units ex-
ceeds specified capacity.
Check capacity of connected indoor units
Outdoor unit
detection
1
Indoor unit
detection
-
Error C, E N 1. Connected indoor unit's capacity is out of
specified range
2. Refrigerant type or brand matching error
1. Check indoor unit type
2. Check refrigerant type and brand
1 Warning Z N Address setting error Check address setting
-AlertZN
1 Error X N 1. Indoor unit signal wire or connector
connection failure during operation
(disconnected or loosened)
2. Power for either indoor or outdoor unit is
OFF when the indoor and outdoor units
are connected to separate power
supplies. (Power failure, open phase)
3. Communication failure caused by noise
or other effect
4. Indoor control PCB failure
1. Check remote controller power supply
and indoor signal wire
2. Refer to P198, 1)Check Power Supply
System
3. Check fuse and transformer
4. Block noise path and shield remote
controller wiring
5. Inspect or replace indoor control PCB
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