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