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Diagnosis display Abnormality/Protection control Abnormality judgement Primary location to verify
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
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