Hitachi RAS-10HRNM, Service Manual, Page: 213 / 482

Alarm codes for IVX and ES Series
Code
No.
Category Type of Abnormality Main cause
01 Indoor unit Activation of protection device
Failure of fan motor, drain discharge, PCB, relay, float switch
activated.
02 Outdoor unit Activation of protection device
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. 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 insufficient
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
Insufficient 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
15 Fresh Outdoor Air Thermistor (Econofresh)
19 Protection device for fan motor is triggered Failure of fan motor
20
Outdoor unit
sensor
Compressor thermistor
Failure of thermistor, sensor, connection. 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. protection
device is activated.
47 Activation of protection device for low pressure drop
Stoppage due to excessive decrease of evaporating
temperature (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.
52
Abnormal thermistor of inverter fin (for inverter fin
temperature)
Shorcircuit or incorrect wiring
53 Activation for protection of DIP IPM, IPM or PCB2
Abnormality of DIP IPM or PCB2
Compressor failure, heat exchanger clogged.
54 Increase in inverter fin temperature
Abnormal inverter fin thermistor
Heat exchanger clogged.
Abnormal outdoor fan.
55 Abnormality of DIP IPM, IPM or PCB2 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.
59 Inverter
Abnormal inverter fin thermistor (for the temperature of
inverter fin)
Lost terminals, disconnected wire, failure of inverter thermistor.
EE Compressor Compressor protection alarm Compressor failure.
8 Troubleshooting
205
SMGB0060 rev. 1- 12/2010
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