Alarm Codes For The Outdoor And Indoor Units - Hitachi RAS-2-HVNP Service Manual

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