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17 Troubleshooting Guide
17.1. Self Diagnosis Function (CU-2E15LBE and CU-2E18LBE)
Abnormality
judgement
Emergency
operation
Primary location to verify
Diagnosis
display
Abnormality or protection control
H11
Indoor/outdoor abnormal
communication
> 1 min after starting
operation
Indoor fan operation can
start by entering into force
cooling operation
• Internal/external cable
connections
• Indoor/outdoor PCB
H12
Indoor unit capacity unmatched
—
—
• Indoor unit total capacity
H14
Intake air temperature unmatched
—
—
• Intake air temperature sensor
(defective or disconnected)
H16
Outdoor current transformer
—
—
• Decreased amount of refrigerant
• Outdoor PCB
H19
Indoor fan motor mechanism lock
—
—
• Fan motor
• Indoor PCB
H23
Indoor heat exchanger temperature
sensor
Continue for 5 sec
—
• Heat exchanger temperature
sensor
(defective or disconnected)
H27
Outdoor air temperature sensor
Continue for 5 sec
—
• Outdoor air temperature sensor
(defective or disconnected)
H28
Outdoor heat exchanger temperature
sensor 1
Continue for 5 sec
—
• Outdoor heat exchanger
temperature sensor
(defective or disconnected)
H30
Outdoor discharge pipe temperature
sensor
Continue for 5 sec
—
• Outdoor discharge pipe
temperature sensor
(defective or disconnected)
H32
Outdoor heat exchanger temperature
sensor 2 (discharge pipe temp)
Continue for 5 sec
—
• Outdoor heat exchanger
temperature sensor
(defective or disconnected)
H34
Outdoor heatsink temperature sensor at
Control Board
Continue for 2 sec
—
• Outdoor heatsink temperature
sensor at control board
(defective or disconnected)
H36
Outdoor gas pipe temperature sensor
Continue for 2 sec
—
• Outdoor gas pipe temperature
sensor
(defective or disconnected)
H37
Outdoor liquid pipe temperature sensor
Continue for 2 sec
—
• Outdoor liquid pipe temperature
sensor
(defective or disconnected)
H39
Abnormal indoor operating unit or
standby units
—
—
• Piping connection error
• Indoor/outdoor connection cable
connection error
H41
Abnormal wiring or piping connection
—
—
• Wiring or piping connection
H97
Outdoor fan motor mechanism lock
—
—
• Outdoor fan motor
H98
Indoor high pressure protection
—
—
• Air filter dirty
• Air circulation short circuit
H99
Indoor heat exchanger freeze
protection
—
—
• Insufficient refrigerant
• Air filter dirty
F11
Cooling/heating cycle changeover
abnormality
4 times occurrences
within 30 minutes
—
• 4-way valve
• V-coil
F17
Indoor standby unit freezing
—
—
• Outdoor expansion valve leakage
• Indoor unit pipe temperature
sensor
F90
PFC circuit protection
—
—
• Outdoor PCB
• Outdoor fan motor
F91
Refrigeration cycle abnormality
2 times occurrences
within 20 minutes
—
• No refrigerant (3-way valve is
closed)
Summary of Contents for CU-2E15LBE
Page 11: ...11 Outdoor Unit CU 2E15LBE Outdoor Unit CU 2E18LBE ...
Page 12: ...12 Outdoor Unit CU 3E18LBE ...
Page 13: ...13 Outdoor Unit CU 4E23LBE ...
Page 14: ...14 ...
Page 15: ...15 Outdoor Unit CU 4E27CBPG ...
Page 16: ...16 ...
Page 17: ...17 3 Dimensions 3 1 CU 2E15LBE CU 2E18LBE 3 2 CU 3E18LBE CU 4E23LBE ...
Page 18: ...18 4 Refrigeration Cycle Diagram 4 1 CU 2E15LBE CU 2E18LBE ...
Page 19: ...19 4 2 CU 3E18LBE ...
Page 20: ...20 4 3 CU 4E23LBE ...
Page 21: ...21 5 Block Diagram 5 1 CU 2E15LBE CU 2E18LBE ...
Page 22: ...22 5 2 CU 3E18LBE ...
Page 23: ...23 5 3 CU 4E23LBE ...
Page 24: ...24 6 Wiring Connection Diagram 6 1 CU 2E15LBE CU 2E18LBE ...
Page 25: ...25 6 2 CU 3E18LBE ...
Page 26: ...26 6 3 CU 4E23LBE ...
Page 27: ...27 7 Electronic Circuit Diagram 7 1 CU 2E15LBE CU 2E18LBE ...
Page 28: ...28 7 2 CU 3E18LBE ...
Page 29: ...29 7 3 CU 4E23LBE ...
Page 30: ...30 8 Printed Circuit Board 8 1 Main Printed Circuit Board 8 1 1 CU 2E15LBE CU 2E18LBE ...
Page 31: ...31 8 1 2 CU 3E18LBE CU 4E23LBE ...
Page 32: ...32 8 2 Noise Filter Printed Circuit Board 8 3 Display Printed Circuit Board ...
Page 35: ...35 9 3 CU 3E18LBE 9 3 1 Check Points ...
Page 36: ...36 9 4 CU 4E23LBE 9 4 1 Check Points ...
Page 68: ...68 ...
Page 69: ...69 19 1 2 Two Indoor Unit Operation ...
Page 70: ...70 ...
Page 71: ...71 19 2 Operation Characteristics CU 2E18LBE 19 2 1 One Indoor Unit Operation ...
Page 72: ...72 ...
Page 73: ...73 19 2 2 Two Indoor Unit Operation ...
Page 74: ...74 ...
Page 75: ...75 19 3 Operation Characteristics CU 3E18LBE 19 3 1 One Indoor Unit Operation ...
Page 76: ...76 ...
Page 77: ...77 ...
Page 78: ...78 ...
Page 79: ...79 ...
Page 80: ...80 ...
Page 81: ...81 19 3 2 Two Indoor Unit Operation ...
Page 82: ...82 ...
Page 83: ...83 ...
Page 84: ...84 ...
Page 85: ...85 19 3 3 Three Indoor Unit Operation ...
Page 86: ...86 ...
Page 87: ...87 19 4 Operation Characteristics CU 4E23LBE 19 4 1 One Indoor Unit Operation ...
Page 88: ...88 ...
Page 89: ...89 ...
Page 90: ...90 ...
Page 91: ...91 ...
Page 92: ...92 ...
Page 93: ...93 19 4 2 Two Indoor Unit Operation ...
Page 94: ...94 ...
Page 95: ...95 19 4 3 Three Indoor Unit Operation ...
Page 96: ...96 ...
Page 97: ...97 19 4 4 Four Indoor Unit Operation ...
Page 98: ...98 ...