Hitachi FSN3E Installation And Operation Manual page 40

TROUBLESHOOTING
Code
Category
number
48
51
53 Inverter
54
55
57 Outdoor fan
b1
Indoor unit
number setting
b5
EE Compressor
34 PMML0354A rev.1 - 03/2015
Abnormality
Activation of overcurrent protection activation for
inverter
Abnormality of current sensor for inverter
Protection activation of inverter module
Inverter fin temperature increase
Inverter module abnormality
Fan motor abnormality
Incorrect setting of the unit and the refrigerant
cycle number.
Incorrect indoor unit connection number setting
Compressor protection
Cause
Failure of DIP-IPM, heat exchanger clogged, locked
compressor, EVI/EVO failure or overcharge.
Failure of control PCB, inverter module.
Inverter module abnormality.
Failure of compressor, clogging of heat exchanger.
Abnormal inverter fin thermistor, clogging of heat exchanger,
abnormal outdoor fan.
Failure of inverter module.
Disconnected wire of incorrect wiring between control PCB and
inverter PCB.
Incorrect wiring or fan motor abnormality.
Over 64 indoor units setting by number or indoor unit address.
There are more than 17 units not corresponding to H-Link II
connected to one system
Failure of compressor.