17.4
Error Codes Table
Diagnosis display
Abnormality/Protection control
H00
No abnormality detected
H12
Indoor/Outdoor capacity unmatched
Outdoor compressor temperature sensor
H15
abnormality
H20
Water pump abnormality
Indoor refrigerant liquid temperature
H23
sensor abnormality
H27
Service valve error
H42
Compressor low pressure abnormality
H62
Water flow switch abnormality
*H63
Refrigerant low pressure abnormality
H64
Refrigerant high pressure abnormality
*H65
Deice circulation error
H70
Back-up heater OLP abnormality
H72
Tank sensor abnormal
Indoor - control panel communication
H76
abnormality
H90
Indoor/outdoor abnormal communication
H91
Tank heater OLP abnormality
H95
Indoor/Outdoor wrong connection
Outdoor high pressure overload
H98
protection
H99
Indoor heat exchanger freeze prevention
F12
Pressure switch activate
F14
Outdoor compressor abnormal revolution
F15
Outdoor fan motor lock abnormality
F16
Total running current protection
Outdoor compressor overheating
F20
protection
IPM (power transistor) overheating
F22
protection
Outdoor Direct Current (DC) peak
F23
detection
F24
Refrigeration cycle abnormality
Cooling/Heating cycle changeover
F25
abnormality
F27
Pressure switch abnormality
Abnormality judgement
—
90s after power supply
Continue for 5 sec.
Continue for 10 sec.
Continue for 5 sec.
Continue for 5 minutes
—
Continue for 1 min.
Continue for 5 sec.
Continue for 5 sec.
Continue for 10 sec.
Continue for 60 sec.
Continue for 5 sec.
—
> 1 min after starting operation
Continue for 60 sec.
—
—
—
4 times occurrence within
20 minutes
4 times occurrence within
20 minutes
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 min.
107
Primary location to verify
—
Indoor/outdoor connection wire
Indoor/outdoor PCB
Specification and combination table in
catalogue
Compressor temperature sensor
(defective or disconnected)
Indoor PCB
Water pump (malfunction)
Refrigerant liquid temperature sensor
(defective or disconnected)
High pressure sensor (defective or
disconnected)
Outdoor pipe temperature sensor
Clogged expansion valve or strainer
Insufficient refrigerant
Outdoor PCB
Compressor
Water flow switch
Outdoor low pressure sensor
(defective or disconnected)
Outdoor high pressure sensor
(defective or disconnected)
Water flow switch sensor (defective or
disconnected)
Water pump malfunction
Buffer tank (is used)
Back-up heater OLP
(Disconnection or activated)
Tank sensor
Indoor - control panel
(defective or disconnected)
Internal/external cable connections
Indoor/Outdoor PCB
Tank heater OLP
(Disconnection or activated)
Indoor/Outdoor supply voltage
Outdoor high pressure sensor
Water pump or water leakage
Clogged expansion valve or strainer
Excess refrigerant
Outdoor PCB
Indoor heat exchanger
Refrigerant shortage
Pressure switch
Outdoor compressor
Outdoor PCB
Outdoor fan motor
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