148
17.4 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
60 times occurence within 480
minutes.
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 abnormality
Continue for 1 min.
Water flow sensor
H63
Abnormal low pressure sensor
4 times in 20 minutes
Low pressure sensor (defective or
disconnect)
H64
Refrigerant high pressure abnormality
5V : Continue for 5 sec.
0V : 4 times occurrence within
120 minutes
Outdoor high pressure sensor
(defective or disconnected)
H65
Abnormal deice water circulation
water flow > 5 l/min
continuously for 20 seconds
during anti freeze deice
Water pump
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