Simple Self-Diagnosis by Malfunction Code
Malfunction
code
Malfunction Contents Supposed causes
Objects
RA
SkyAir
VRV
Package
Heat reclaim ventilator
Chiller
Fan Coil
Others
72
System No. 2
Fan motor overcurrent
Defective fan motor connector contact
Defective fan motor
Defective PCB
k
73
System No. 2
Actuation of high pressure switch
(HPS)
Dirty heat exchanger
Shortage of water volume
Clogged refrigerant piping
Defective connector contact
Defective HPS
k
74
System No. 2
Actuation of low pressure switch
(LPS)
Clogged refrigerant piping
Defective connector contact
Shortage of gas
Defective LPS
k
75
System No. 2
Malfunction of low pressure sensor
Defective connector contact
Defective low pressure sensor
Defective PCB
k
76
System No. 2
Malfunction of high pressure
sensor
Defective connector contact
Defective high pressure sensor
Defective PCB
k
77
System No. 1
Malfunction of fan inter lock
Defective relay contact
Broken wire
k
78
System No. 2
Malfunction of fan inter lock
Defective relay contact
Broken wire
k
7A
System No. 2
Malfunction of compressor current
sensor
Defective current sensor
Defective compressor
Defective outdoor unit PCB
k
7C
System No. 2
Malfunction of pump inter lock
Cooling water pump interlock actuated
k
80
Malfunction of entering water
temperature thermistor
Defective connector contact
Defective entering water temperature thermistor
k
81
Malfunction of leaving water
temperature thermistor or drain
pipe heater
Defective connector contact
Defective leaving water temperature thermistor
k
82
System No. 1
Malfunction of refrigerant
thermistor
Defective connector contact
Defective refrigerant thermistor
k
83
System No. 2
Malfunction of refrigerant
thermistor
Defective connector contact
Defective refrigerant thermistor
k
84
System No. 1
Malfunction of heat exchanger
thermistor
Defective connector contact
Defective heat exchanger thermistor
k
85
System No. 2
Malfunction of heat exchanger
thermistor
Defective connector contact
Defective heat exchanger thermistor
k
86
System No. 1
Malfunction of discharge pipe
thermistor
Defective connecting connector
Defective discharge pipe thermistor
k
88
System No. 2
Malfunction of discharge pipe
temperature
Shortage of gas
Defective discharge pipe thermistor
Defective connector contact
Clogged refrigerant piping
k
89
Malfunction of brazed-plate heat
exchanger freezing
Dirty heat exchanger
Shortage of refrigerant amount
Defective thermistor
k
8A
System No. 2
Malfunction of leaving water
temperature thermistor
Defective connector contact
Defective leaving water temperature thermistor
k
8E
System No. 1
Malfunction of suction pipe
thermistor 1 for heating
Defective connector contact
Defective suction pipe thermistor
k
8F
System No. 1
Malfunction of suction pipe
thermistor 2 for heating
Defective connector contact
Defective suction pipe thermistor
k
Malfunction
code
Malfunction Contents Supposed causes
Objects
RA
SkyAir
VRV
Package
Heat reclaim ventilator
Chiller
Fan Coil
Others
8H
Abnormal hot water high
temperature
Three way valve malfunction
Defective thermistor
Defect of water temperature setting
k
90
Abnormal chilled water quantity or
abnormal AXP
Shortage of water volume
Disconnection of AXP
k
91
System No. 2
Malfunction of electronic expansion
valve
Defective connector contact
Defective electronic expansion valve coil
k
92
System No. 2
Malfunction of suction pipe
thermistor
Defective connector contact
Defective suction pipe thermistor
k
94
Malfunction of transmission
(between heat reclaim ventilator
and fan unit)
Defective fan unit PCB
Defective connecting wire between (1) and (2)
k
95
System No. 1
Malfunction of inverter system
Defective fan inverter unit
k
96
System No. 2
Malfunction of inverter system
Defective fan inverter unit
k
97
Malfunction of thermal storage unit Defective thermal storage unit
k
98
Malfunction of thermal storage
brine pump
Actuation of thermal storage brine pump overcurrent (OC)
k
99
Malfunction of thermal storage
brine tank
Low water level of thermal storage brine tank
k
I
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