Hitachi RAS-3-HVNC - Alarm Codes for the Outdoor and Indoor Units

8. Troubleshooting
193
SMGB0079 rev.0 - 01/2013
8
8.2.2 Alarm codes for the outdoor and indoor units
Code
No.
Category Type of Abnormality Main cause
01 Indoor unit Activation of protection device (oat switch)
Failure of fan motor, drain discharge, PCB, relay, oat switch
activated.
02 Outdoor unit Activation of protection device (high pressure cut)
Activation of PSH, locked motor, abnormal operation in the
power supply phase.
03
Transmission
Abnormality between indoor (or outdoor) and outdoor
(or indoor) units
Incorrect wiring. Loose terminals, Failure of PCB. Tripping of
fuse. Power supply OFF.
04
Abnormal operation between inverter and control
PCB
Transmission failure between inverter PCBs
05 Power supply Abnormal power supply Power source with abnormal wave pattern.
06 Voltage drop
Voltage drop due to excessively low or high voltage in
outdoor unit
Voltage drop in power supply. Incorrect wiring or insufcient
capacity of power supply wiring.
07
Cycle
Drop in discharge gas overheating Excessive refrigerant charge. Expansion valve lock open.
08 Increase in discharge gas temperature
Insufcient refrigerant charge, refrigerant leakage. Expansion
valve closed or clogged.
11
Sensor in indoor
unit
Inlet air thermistor
Failure of thermistor, sensor, connection.
12 Outlet air thermistor
13 Anti-freeze thermistor
14 Gas pipe thermistor
19 Protection device for fan motor is triggered Failure of fan motor
20
Outdoor unit
sensor
Compressor thermistor
Failure of thermistor, sensor, connection.
21 Abnormality of high pressure sensor
22 Outside air thermistor
24 Evaporation thermistor
31
System
Incorrect setting of outdoor and indoor units Incorrect setting of capacity code.
35 Incorrect setting of indoor unit number Duplication of indoor unit number.
38 Abnormality of protective circuit in outdoor unit
Failure of indoor unit PCB; incorrect wiring; connection to
indoor unit PCB.
41
Pressure
Cooling overload (possible activation of high pressure
device)
O.U. pipe thermistor temp. is higher than 55 ºC and the
compressor top temp. is higher than 95 ºC, O.U. protection
device is activated.
42
Heating overload (high-pressure device may be
activated)
If I.U. freeze protection thermistor temp. is higher than 55 ºC
and compressor top temp. is higher than 95 ºC, O.U. protec-
tion device is activated.
45 Activation of high pressure increase protection device
If the discharge pressure (Pd) of the compressor is higher
than 3.8MPa for 1 minute.
47 Activation of protection device for low pressure drop
Stoppage due to excessive decrease of evaporating temper-
ature (Temp < -35 ºC) is activated 3 times in one hour, motor
locked in heating mode.
48
Inverter
Activation of overcurrent protection
Overload, overcurrent. Failure of DIP IPM, IPM or PCB2,
heat exchanger clogged, locked compressor.
51 Abnormality in inverter current sensor
Incorrect wiring of current sensor. Failure of control PCB, DIP
IPM, IPM or PCB2.
53 Activation of transistor module protection device
Abnormality of DIP IPM or PCB2
Compressor failure, heat exchanger clogged.
54 Abnormality of inverter n temperature
Abnormal inverter n thermistor
Heat exchanger clogged.
Abnormal outdoor fan.
55 Abnormality of inverter module Failure of DIP-IPM, IPM or PCB2.
57 Outdoor fan Fan motor abnormality
Disconnected wire or incorrect wiring between control PCB
and inverter PCB.
Incorrect wiring or abnormality in fan motor.
EE Compressor Compressor protection alarm Compressor failure.
b0 IU Model Setting Incorrect Setting of Unit Model No Setting of Unit Model, Incorrect Setting of Unit Model
b1
IU No.Setting
Incorrect unit No. setting Over 64 indoor units, setting by no. or indoor unit address.
b5 Incorrect Setting of Indoor Unit No. for H-LINK Type
An indoor unit not supporting H-LINK II is set the indoor unit
No. as 16 and after.