User`s guide

Page 34
Section 12: Error codes
Diagnosis
display
Abnormality / Protection
control
Abnormality Judgement
Primary location to verify
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 - remote control
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.
• Domestic hot water cylinder high limit
stat or temperature thermostat
disconnection or activated.
• Check thermostat is set to maximum
temperature on the cylinder.
•Test for continuity between pins13 and
14 at the heat pump.
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