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Diagnosis
display
Outdoor fan motor lock
F15
abnormality
Total running current
F16
protection
Outdoor compressor
F20
overheating protection
IPM (power transistor)
F22
overheating protection
Outdoor direct current
F23
(DC) peak detection
Refrigeration cycle
F24
abnormality
Cooling / Heating
F25
cycle changeover
abnormality
Pressure switch
F27
abnormality
Low discharge
F29
superheat
Water outlet sensor 2
F30
abnormality
Abnormal internal
F32
thermostat
Outdoor air
F36
temperature sensor
abnormality
Indoor water inlet
F37
temperature sensor
abnormality
Outdoor discharge
F40
pipe temperature
sensor abnormality
F41
PFC control
28
Abnormality /
Protection control
Abnormality
judgement
2 times occurrence
within 30 minutes
3 times occurrence
within 20 minutes
4 times occurrence
within 30 minutes
3 times occurrence
within 30 minutes
7 times occurrence
continuously
2 times occurrence
within 20 minutes
4 times occurrence
within 30 minutes
Continue for 1
minute
1 time occurrence
within 2550 minutes
Continue for 5s
Continue for 5s
Continue for 5s
Continue for 5s
Continue for 5s
4 times occurrence
within 10 minutes
Primary location to verify
· Compressor tank temperature sensor
· Clogged expansion valve or strainer
· Insufficient refrigerant
· Outdoor PCB
· Compressor
· Excess refrigerant
· Outdoor PCB
· Compressor tank temperature sensor
· Clogged expansion valve or strainer
· Insufficient refrigerant
· Outdoor PCB
· Compressor
· Improper heat exchange
· IPM (power transistor)
· Outdoor PCB
· Compressor
· Insufficient refrigerant
· Outdoor PCB
· Compressor low compression
· 4-way valve
· V-coil
· Pressure switch
· Discharge temperature sensor
· Discharge pressure sensor
· Pressure switch
· Outdoor PCB
· Water outlet sensor 2 (defective or
disconnected)
· Control panel PCB thermostat
· Outdoor air temperature sensor
(defective or disconnected)
· Water inlet temperature sensor
(defective or disconnected)
· Outdoor discharge pipe temperature
sensor (defective or disconnected)
· Voltage at PFC
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