93
17.4. Error Codes Table
Abnormality / Protection control Abnormality Judgement Primary location to verifyDiagnosis display
H00 No abnormality detected — —
H12 Indoor/Outdoor capacity unmatched 90s after power supply • Indoor/outdoor connection wire
• Indoor/outdoor PCB
• Specification and combination table in
catalogue
H15 Outdoor compressor temperature sensor
abnormality
Continue for 5 sec. • Compressor temperature sensor
(defective or disconnected)
H23 Indoor refrigerant liquid temperature
sensor abnormality
Continue for 5 sec. • Refrigerant liquid temperature sensor
(defective or disconnected)
H42 Compressor low pressure abnormality — • Outdoor pipe temperature sensor
• Clogged expansion valve or strainer
• Insufficient refrigerant
• Outdoor PCB
• Compressor
H62 Water flow switch abnormality Continue for 1 min. • Water flow switch
H64 Refrigerant high pressure abnormality Continue for 5 sec. • Outdoor high pressure sensor
(defective or disconnected)
H70
Back-up heater OLP abnormality Continue for 60 sec. • Back-up heater OLP
(Disconnection or activated)
H72 Tank sensor abnormal Continue for 5 sec. • Tank sensor
H76 Indoor - control panel communication
abnormality
— • Indoor - control panel
(defective or disconnected)
H90 Indoor / outdoor abnormal
communication
> 1 min after starting operation • Internal / external cable connections
• Indoor / Outdoor PCB
H91
Tank heater OLP abnormality Continue for 60 sec. • Tank heater OLP
(Disconnection or activated)
H95 Indoor/Outdoor wrong connection — • Indoor/Outdoor supply voltage
H98 Outdoor high pressure overload
protection
— • Outdoor high pressure sensor
• Water pump or water leakage
• Clogged expansion valve or strainer
• Excess refrigerant
• Outdoor PCB
H99
Indoor heat exchanger freeze prevention
—
• Indoor heat exchanger
• Refrigerant shortage
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)
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