Hitachi UTOPIA R32 Series Installation And Operation Manual page 71

Code Category
3A
3b
Outdoor Unit
3d
Abnormal combination between
3E
43
44
Protection
45 Device
47
48
49 Outdoor Unit
indoor unit and outdoor unit side
51 Sensor
53
Inverter
54
55
57
5A
Fan Controller
5b
5C
A1 External Input
PMEN0654 rev.0 - 12/2023
Content of Abnormality
Abnormality of outdoor unit
capacity
Incorrect setting of outdoor unit
models combination or voltage
Abnormal communication
between main unit and sub
unit(s)
inverter PCB and outdoor PCB
Activation of pressure ratio
decrease protection
Activation of low pressure
increase protection
Activation of high pressure
increase protection
Activation of low pressure
decrease protection
Activation of inverter
overcurrent protection
Shortage of energy transfer at
Abnormal inverter current
sensor
Inverter error signal detection
Abnormality of inverter fin
temperature
Inverter failure
Activation of fan controller
protection
Abnormality of fan controller fin
temperature
Activation of overcurrent
protection
Abnormality of fan controller
sensor
Detection of external
abnormality
Leading Cause
Outdoor unit capacity > permitted maximum
Incorrect setting of main and sub units(s) combination or
voltage
Incorrect wiring, disconnect wire, breaking wire, PCB
failure
Incorrect combination between inverter PCB and outdoor
PCB
Defective compression (failure of compressor or inverter,
loose power supply Connection)
Overload at cooling, high temperature at heating,
expansion valve locking at open position (loose
connector)
Overload operation (heat exchanger clogging, short
circuit of airflow), pipe clogging, excessive refrigerant,
inert gas mixing
Insufficient refrigerant, piping clogging, expansion valve
locking at close position (loosen connector)
Overload operation, compressor failure
Shortage of refrigerant due to gas leakage
Current sensor failure
Driver IC error signal detection (protection for
overcurrent, voltage decrease, short circuit),
instantaneous overcurrent
Abnormal inverter fin thermistor, heat exchanger
clogging, fan motor failure
Inverter PCB Failure
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)
Input signal by external abnormality detection setting
14
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