User`s guide

Page 35
Diagnosis
display
Abnormality / Protection
control
Abnormality Judgement
Primary location to verify
F12
Pressure switch activate
4 times occurrence within 20
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 30
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 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
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)