159
16.4 Error Codes Table
Diagnosis display
Abnormality/Protection control
Abnormality judgement
Primary location to verify
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)
H20
Water pump abnormality
Continue for 10 sec.
Indoor PCB
Water pump (malfunction)
H23
Indoor refrigerant liquid temperature
sensor abnormality
Continue for 5 sec.
Refrigerant liquid temperature sensor
(defective or disconnected)
H27
Service valve error
Continue for 5 minutes
High pressure sensor (defective or
disconnected)
H28
Abnormal solar sensor
Continue for 5 sec.
Solar temperature sensor (defective or
disconnected)
H31
Abnormal swimming pool sensor
Continue for 5 sec.
Pool temperature sensor (defective or
disconnected)
H36
Abnormal buffer tank sensor
Continue for 5 sec.
Buffer tank sensor (defective or
disconnected)
H38
Brand code not match
When indoor and outdoor
brand code not same
—
H42
Compressor low pressure abnormality
—
Outdoor pipe temperature sensor
Clogged expansion valve or strainer
Insufficient refrigerant
Outdoor PCB
Compressor
H43
Abnormal Zone 1 sensor
Continue for 5 sec.
Water temperature Zone 1 sensor
H44
Abnormal Zone 2 sensor
Continue for 5 sec.
Water temperature Zone 2 sensor
H62
Water flow switch abnormality
Continue for 1 min.
Water flow switch
*H63
Refrigerant low pressure abnormality
Continue for 5 sec.
Outdoor low pressure sensor
(defective or disconnected)
H64
Refrigerant high pressure abnormality
Continue for 5 sec.
Outdoor high pressure sensor
(defective or disconnected)
*H65
Deice circulation error
Continue for 10 sec.
Water flow switch sensor (defective or
disconnected)
Water pump malfunction
Buffer tank (is used)
H67
Abnormal External Thermistor 1
Continue for 5 sec.
Room temperature Zone 1 sensor
H68
Abnormal External Thermistor 2
Continue for 5 sec.
Room temperature Zone 2 sensor
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
H74
PCB communication error
Communication or transfer
error
Indoor main PCB and Sub PCB
H75
Low water temperature control
Room heater disable and deice
request to operate under low
water temperature
Heater operation must enable to
increase water temperature
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