Hitachi UTOPIA RAS-4HVRP2E Service Manual page 264

10 Troubleshooting
Troubleshooting procedure
Code Category
57 Activation of Fan Controller Protection
Abnormality of Fan Controller Fin
5A
Temperature
Fan Controller
5b Activation of Overcurrent Protection
5C Abnormality of Fan Controller Sensor
Alarm of abnormality of fan or compressor
88 Outdoor unit
unit
A1 External Input Detection of External Abnormality
b0 Incorrect Setting of Unit Model Code
Incorrect Setting of Unit and Refrigerant
b1
Cycle Number
b2 Abnormality of EEPROM
Wrong combination of indoor unit and
b3
remote control switches
Indoor Unit
b5 Incorrect Indoor Unit Number Setting
Abnormal Communication between
b6
Indoor PCB and Indoor Fan Controller
Transmission abnormality between the
b7
indoor and the PCB for 2 fans
Abnormality in the number of
bF
connectedsub-PCB
Compressor Protection Alarm
EE Compressor
(It can not be reset from Wired Controller)
262 SMGB0136 rev.0 - 07/2021
Content of Abnormality Leading Cause
Driver IC Error Signal Detection (Protection for Overcurrent,
Voltage Decrease, Short Circuit), Instantaneous Overcurrent
Fin Thermistor Failure, Heat Exchanger Clogging, Fan
Motor Failure
Fan Motor Failure
Failure of Current Sensor (Instantaneous Overcurrent,
Increase of Fin Temperature, Voltage Decrease, Grand
Fault, Step-Out)
The fan or compressor driver do not transfer and
identification code
Input Signal by External Abnormality Detection Setting
Incorrect Setting of Indoor Unit Model
64 or More Number is Set for Address or Refrigerant Cycle
EEPROM failure, Incorrect Data of EEPROM
Wrong combination of indoor unit and remote control
switches
There are 17 or More Non-Corresponding to H-LINK II Units
are Connected to One System.
Communication Failure, Disconnected Communication
Cable, Abnormal Connection
Transmission abnormality between the indoor and the
PCBfor 2 fans
Abnormality in the number of connected sub-PCB
This alarm code appears when the following alarms* occurs
three times within 6 hours.
*02, 07, 08, 39, 43 to 45, 47