149
Diagnosis display
Abnormality/Protection control
Abnormality judgement
Primary location to verify
H98
Outdoor high pressure overload
protection
—
Outdoor high pressure sensor
Water pump or water leakage
Clogged expansion valve or strainer
Excess refrigerant
Outdoor PCB
F95
Cooling high pressure overload
protection
4 times occurrence within 20
minutes
Outdoor high pressure sensor
Fan motor
Clogged expansion valve or strainer
Excess refrigerant
Outdoor PCB
H99
Indoor heat exchanger freeze prevention
10 sec
Indoor heat exchanger
Refrigerant shortage
F12
Pressure switch activate
4 times occurrence within
30 minutes
Pressure switch
F14
Outdoor compressor abnormal revolution
4 times occurrence within
20 minutes
Outdoor compressor
F15
Outdoor fan motor lock abnormality
2 times occurrence within
20 minutes
Outdoor PCB
Outdoor fan motor
F16
Total running current protection
3 times occurrence within
20 minutes
Excess refrigerant
Outdoor PCB
F20
Outdoor compressor overheating
protection
4 times occurrence within
20 minutes
Compressor tank temperature sensor
Clogged expansion valve or strainer
Insufficient refrigerant
Outdoor PCB
Compressor
F22
IPM (power transistor) overheating
protection
4 times occurrence within
30 minutes
Improper heat exchange
IPM (Power transistor)
F23
Outdoor Direct Current (DC) peak
detection
7 times occurrence
continuously
Outdoor PCB
Compressor
F24
Refrigeration cycle abnormality
2 times occurrence within
30 minutes
Insufficient refrigerant
Outdoor PCB
Compressor low compression
F25
Cooling/Heating cycle changeover
abnormality
4 times occurrence within
30 minutes
4-way valve
V-coil
F27
Pressure switch abnormality
Continue for 1 min.
Pressure switch
F30
Water outlet sensor 2 abnormality
Continue for 5 sec.
Water outlet sensor 2 (defective or
disconnected)
F32
Abnormal Internal Thermostat
Continue for 5 sec.
Control panel PCB thermostat
F36
Outdoor air temperature sensor
abnormality
Continue for 5 sec.
Outdoor air temperature sensor
(defective or disconnected)
F37
Indoor water inlet temperature sensor
abnormality
Continue for 5 sec.
Water inlet temperature sensor
(defective or disconnected)
F40
Outdoor discharge pipe temperature
sensor abnormality
Continue for 5 sec.
Outdoor discharge pipe temperature
sensor (defective or disconnected)
F41
PFC control
4 times occurrence within
10 minutes
Voltage at PFC
F42
Outdoor heat exchanger temperature
sensor abnormality
Continue for 5 sec.
Outdoor heat exchanger temperature
sensor (defective or disconnected)
F43
Outdoor defrost sensor abnormality
Continue for 5 sec.
Outdoor defrost sensor (defective or
disconnected)
F45
Indoor water outlet temperature sensor
abnormality
Continue for 5 sec.
Water outlet temperature sensor
(defective or disconnected)
F46
Outdoor Current Transformer open
circuit
—
Insufficient refrigerant
Outdoor PCB
Compressor low
F48
Outdoor EVA outlet temperature sensor
abnormality
Continue for 5 sec.
Outdoor EVA outlet temperature sensor
(defective or disconnected)
F49
Outdoor bypass outlet temperature
sensor abnormality
Continue for 5 sec.
Outdoor bypass outlet temperature
sensor (defective or disconnected)