Hitachi RAS-3.0HNSKQ, Original Instruction, Page: 49 / 52

40
Table 7.2 Alarm Code
Alarm
Code
Malfunction Reason
（
01
）
Activation of Protection Device
(Float Switch)
Activation of Float Switch (High Water Level in Condensation
Drainage Pan, Problem with Drain Piping, Float Switch, or
Condensation Drainage 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
04
Abnormal Communication between Inverter
PCB and Outdoor PCB
Inverter PCB-Outdoor Unit PCB Communication Failure
(Loose Connector, Wire Breaking, Blown of Fuse)
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
（
18
）
Activation of Protection Device for Invertor
PCB of Indoor Fan
（
19
）
Activation of Protection Device for Indoor
Fan
Fan Motor Overheat, Lockup
（
1A
）
Abnormality of Fin Temperature of Indoor
Fan Controller
（
1b
）
Overcurrent of Indoor Fan Controller
（
1C
）
Abnormality of Current Sensor of Indoor
Fan Controller
（
1d
）
Indoor Fan Controller Protection Action
（
1E
）
Abnormality of Voltage of Indoor Fan
Controller
20 Abnormality of Discharge Gas Thermistor
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