149
Diagnosis display
Abnormality/Protection control
Abnormality judgement
Primary location to verify
F20
Outdoor compressor overheating
protection
4 times occurrence within
30 minutes
Compressor tank temperature sensor
Clogged expansion valve or strainer
Insufficient refrigerant
Outdoor PCB
Compressor
F22
IPM (power transistor) overheating
protection
3 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
20 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
F29
Low Discharge Superheat
1 times occurrence within
2550 minutes
Discharge Temperature Sensor
Discharge Pressure Sensor
Pressure Switch
Outdoor PCB
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)
F95
Cooling high pressure overload
protection
—
Outdoor high pressure sensor
Water pump or water leakage
Clogged expansion valve or strainer
Excess refrigerant
Outdoor PCB
Note:
* This error code is not applicable for this system.