Simple Self-Diagnosis by Malfunction Code
Malfunction
code
Malfunction Contents
Supposed causes
Objects
RA
SkyAir
VR
V
Pa
c
k
a
g
e
Heat rec
laim ventilator
Chiller
F
an Coil
Other
s
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
VR
V
Pa
c
k
a
g
e
Heat rec
laim ventilator
Chiller
F
an Coil
Other
s
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
