Hitachi RAS-070HNBRMQ2, Manual

Page: 46 / 48

Table 7.2 Alarm Code
Alarm
Code
Malfunction Reason
（
01
）
Activation of Protection Device
(Float Switch)
Activation of Float Switch
,
High Water Level in Drain Pan
02
Activation of Protection Device
(High Pressure Cut)
Activation of PSH (Pipe Clogging, Excessive Refrigerant,
Inert Gas Mixing)
03
Abnormal Communication between Indoor
and Outdoor Units
Incorrect Wiring, Loose Terminals, Disconnect Wire, Blowout
of Fuse, Outdoor Unit Power OFF
05 Abnormality of Power Supply Phases
Incorrect Power Source, Connection to Reversed Phase,
Open-Phase
06 Abnormal Inverter Voltage Outdoor Voltage Drop, Insuff cient Power Capacity
07 Decrease in Discharge Gas Superheat
Excessive Refrigerant Charge, Failure of Thermistor,
Incorrect Wiring, Incorrect Piping Connection, Expansion
Valve Locking at Opened Position (Disconnect Connector)
08 Increase in Discharge Gas Temperature
Insuff cient Refrigerant Charge, Pipe Clogging, Failure of
Thermistor, Incorrect Wiring. Incorrect Piping Connection,
Expansion Valve Locking at Closed Position (Disconnect
Connector)
11
Abnormality of Inlet Air Thermistor
Incorrect Wiring, Disconnecting Wiring Breaking Wire, Short
Circuit
12
Abnormality of Outlet Air Thermistor
13 Freeze Protection Thermistor
14 Abnormality of Gas Piping Thermistor
16
Abnormality of Remote Sensor (DOAS)
17
Abnormality of Thermistor Built-in Wired
Controller
Incorrect Wiring, Severed or Disconnecting Wiring, Short
Circuit
21 Abnormality of High Pressure Sensor
22 Abnormality of Outdoor Air Thermistor
24
Abnormality of Heat Exchanger Liquid Pipe
Thermistor
29 Abnormality of Low Pressure Sensor
31
Incorrect Capacity Setting of Outdoor Unit
and Indoor Unit
Incorrect Capacity Code Setting of Combination Excessive
or Insufficient Indoor Unit Total Capacity Code
35 Incorrect Setting of Indoor Unit No. Duplication of Indoor Unit No. in same Refrigerant Group
36 Incorrect of Indoor Unit Combination
Outdoor unit, indoor machine different Tier, brand exception
combination
39
23 Abnormality of Discharge Gas Thermistor
38
Abnormality of Picking up Circuit for
Protection in Outdoor Unit
Failure of Protection Detecting Device
(Incorrect Wiring of Outdoor PCB)
43
Activation of Pressure Ratio Decrease
Protection Device
Defective Compression (Failure of Compressor of Inverter,
Loose Power Supply Connection)
44
Activation of Low Pressure Increase
Protection Device
Overload at Cooling, High Temperature at Heating,
Expansion Valve Locking (Loose Connector)
45
Activation of High Pressure Increase
Protection Device
Overload Operation (Clogging, Short-Pass), Pipe Clogging,
Excessive Refrigerant, Inert Gas Mixing
47
Activation of Low Pressure Decrease
Protection Device (Vacuum Operation
Protection)
Insuff cient Refrigerant, Refrigerant Piping, Clogging,
Expansion Valve Locking at Open Position (Loose
Connector)
48
Activation of Inverter Overcurrent
Protection Device
Overload Operation, Compressor Failure