Hitachi UTOPIA RASC Series Installation And Operation Manual page 44

TROUBLESHOOTING
Code No. Category
01 Indoor unit
RASC unit
02 or
Power source
03
Transmission
04
06 Voltage drop
07
Cycle
08
11
12
Sensor in
13
indoor unit
14
19
20
22 Sensor on RASC unit
24
31
35 System
38
41
42 Pressure
47
48
51
53
Inverter
54
55
59
b1 Indoor unit No. setting
EE Compressor
Type of Abnormality
Activation of protection device
Activation of protection device
or
Abnormality of power source wiring
Abnormality between indoor (or RASC unit)
and RASC unit (or indoor) units
Abnormal operation between inverter and
control PCB
Voltage drop due to excessively low
or high voltage in RASC unit
Drop in discharge gas overheating
Increase in discharge gas temperature
Inlet air thermistor
Outlet air thermistor
Anti-freeze thermistor
Gas pipe thermistor
Protection device for fan motor is triggered
Compressor thermistor
Outside air thermistor
Evaporation thermistor
Incorrect setting of RASC unit and indoor units
Incorrect setting of indoor unit number
Abnormality of protective circuit in RASC unit unit
Overload cooling
(possible activation of high pressure device)
Heating overload
(high-pressure device may be activated)
Enabling of protection device for low pressure drop
Activation of overcurrent protection
Abnormality in inverter current sensor
Activation for protection of Inverter
Inverter fin temperature increase
Inverter Abnormality
Inverter fin temperature increase
Incorrect unit No. setting
Compressor protection alarm
Main Cause
Float switch activated.
Activation of: PSH, Float Switch, Magnetic Circuit Braker (Fan line
10 HP only), Locked Motor
or
Incorrect wiring (wrong phase connection).
Incorrect wiring. Failure of PCB. Tripping of fuse. Power supply OFF.
Transmission failure between inverter PCBs.
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.
RASC unit pipe thermistor temp. is higher than 55ºC and the
compressor top temp. is higher than 95ºC, RASC unit protection
device is activated.
If I.U. freeze protection thermistor temp. is higher than 55ºC and
compressor top temp. is higher than 95ºC, RASC unit protection
device is activated.
Stoppage due to excessive decrease of evaporating temperature
(Tem < -35ºC) is activated 3 times in one hour, motor locked in
heating operation.
Clogging of heat exchanger. Locked compressor. Excessive
refrigerant charge, Failure of Inverter PCB.
Failure of Control PCB or Inverter PCB.
Inverter PCB Abnormality
Compressor failure, heat exchanger clogged.
Abnormal inverter fin thermistor
Heat exchanger clogged.
Abnormal RASC unit fan.
Failure of Fan Motor.
Failure of Inverter PCB.
Loose disconnected, broken or short-circuit connector.
Over 64 indoor units, setting by refrigerant cycle No. or indoor unit
address.
Compressor failure.
PMML0140A rev.1 - 07/2009
44